Introduction Of Non-Woven Filter Bag

The non-woven filter bag is a kind of water purification filter bag with the formed 3D porous structure filter layer. Its loose fiber structure and super-strong permeability can ensure the liquid flux and the capacity of impurities.

Features

The non-woven filter bag is superiorly strong at the performance of dirt holding capacity and high flow rate as well, due to its unique crisscrossed filter structure and the calendering treatment adopted. Also, its depth range of filtration could be accurate between 0.5 to 600μm.

Most of the non-woven filter bag is made of 100% pure polyester fiber filter cloth with high strength, whose high-pressure resistance could directly avoid the damage caused by the increase of fluid pressure during the filtration process. Meanwhile, it also equipped with strong corrosion resistance to the acid and alkaline samples and temperature resistance up to 150 degrees. The low cost and wide application range are also one of its highlight features.

Application

The non-woven filter bag has excellent filtration effects for various types of impurities. It is quite suitable for the filtration of various medium and low viscosity fluids in diverse industries, such as petrochemicals, automobile manufacturing, paint coatings, metal processing, water treatment, pharmaceuticals, food, etc.

Introduction Of Non-Woven Filter Bag

How To Relieve The Situation Of The Vacuum Filtration Devices

The experimenters often need to filter some sample solutions with more particulate matter or viscous sample solutions in the laboratory vacuum filtration experiment. However, when they do experiments with these kinds of sample solutions, it is often unable to filter frequently. The situation is usually caused by the solid particles in the solutions completely blocking the pores on the surface of filter membranes. And here we will recommend the following methods to deal with the situation.

The first method is to dilute the sample solutions. The solid particles in the solutions are always blocking the microporous membrane or the pores on the filter papers when detecting and filtering the suspended solids, which will lead the vacuum filtration goes badly. Considering the situation, we can dilute the sample solutions and then filter them.

The second method is to increase the filter area. The vacuum filtration device is often capable to place the membrane with a diameter of 50 mm in the current market. When the vacuum filtration is not going well, we can exchange the membrane with a larger diameter. As a consequence, the solid particles in the sample solutions can be easier to get through.

The third method is to improve the vacuum degree. Exchange a vacuum filtration device with a higher vacuum degree may relieve the situation of immovable filtration to a certain extent.

How To Relieve The Situation Of The Vacuum Filtration Devices

Dust Cleaning Principle Of Extraction Thimble

Usually, the extraction thimble is cleaned by air-artery flushing and back-blowing system, which consists of the airbag, electromagnetic pulse valve, PLC controller and compressed air. One end of the pulse valve is connected with a compressed air storage tank, and the other end is connected with the injection device.

An exhaust valve is installed on the valve cover, and the exhaust valve is controlled by a PLC pulse controller. When no signal is sent out by the PLC controller, the movable baffle of the exhaust valve is in the position of the closed exhaust hole.

When the program controller sends out the signal, the movable baffle opens and the compressed air of the storage tank quickly relieves pressure, so the corrugated film inside the exhaust valve is pressed in the opposite direction, the jet opens, and the compressed air enters the filter through the pulse valve. The cylinder is sprayed to clean the ash.

Every time the soot cleaning is completed at about 0.1-0.3S, it is the high-pressure air ejected at this instant that has a good effect on soot cleaning. Pulse injection pressure is 0.4-0.6 MPa, and constant gas supply must be maintained in operation.

Dust Cleaning Principle Of Extraction Thimble

Brief Intro of Hawach Bottle-Top Dispenser

The bottle top dispenser is the ideal tool for handling strong and corrosive chemicals in the lab. Hawach bottle-top dispensers are made of excellent chemical resistant materials, such as PTFE, FEP, BSG, PP. They can be used for lots of dangerous or toxic solvents such as acids, saline solutions, and organic solvents in the safest way. And they are Fully autoclavable at 121℃. You can find Hawach products in mechanical and electronic bottle-top dispensers.

Hawach mechanical bottle-top dispensers have 4 ranges : 0.5-5mL, 1-10mL, 2.5-25mL, and 5-50mL. With 5 kinds of adapters, they can be used in different reagents bottles. And the volume regulation can be done quickly and accurately. If you choose Hawach mechanical bottle-top dispensers, the solvent of your application can be effectively removed in the organic synthesis or petrochemical industry, especially in the petrochemical industry.

By reducing the human factors in the separation process effectively, Hawach electronic bottle-top dispenser can make the result more accurate. The electronic control system can guarantee the process more stable and reliable.

Brief Intro of Hawach Bottle-Top Dispenser

Some Notes of Using Filter Paper

When there are not descriptions on the boxes of using either qualitative filter paper or quantitative filter paper to filter the sediment, it should be noticed that firstly we take natural filtration and use the filter paper and the ability to entrap solid particles to separate the solid from the liquid.

Secondly, as the mechanical strength and toughness of the filter paper are both small, we should try to minimize the use of suction filtration. If the filtration rate must be accelerated, in order to avoid filtration failures and according to the extraction force, we can stack up two or three layers of filter papers in the funnel when using an air pump to do filtration.

When using vacuum filtration, we can lay a densified filter cloth in the funnel in advance, and then put the filter paper on it to do filtration. Furthermore, it is better not to filter hot concentrated sulfuric acid and nitric acid solution with the filter paper.

When performing the mineral wet ultra-fine grinding experiment, as the bore diameter of qualitative filter paper is not regular and relatively large, we can use quantitative filter paper with small-bore diameter to separate and dry samples of some micrometers.

Some Notes of Using Filter Paper

Information Of Sterilized Syringe Filter

The sterilized syringe filter is a lab filtration tool connected to the front end of the syringe. It is quite suitable for the filtration of aqueous and organic solvents with low solubility. There is a wide range of selection for its membrane materials, which could satisfy various demands from different industries.

Structure of Sterilized Syringe Filter
The sterilized syringe filter is produced in a controlled environment, where it will be assembled automatically without any human touch. It is mainly composed of a filter housing, a support basket, and a filter bag. The samples could be distributed evenly during the filtration process, which ensures a high flow rate and precise result. Usually, there are two kinds of sterilization methods, including steam sterilization and ethylene oxide gas sterilization. It is worthy of noticing that a sterilized syringe filter cannot be used for more than one day.

Application
The sterilized syringe filter is perfect for the filtration of protein solutions with the lowest protein adsorption. The one with a large pore size is available for sample clarification and prefiltration.

In the medical industry, it could be used for the inspection of particles and bacteria, which can improve the quality of the drug and the pass rate of clarity. It can also be applied to scientific research filed, such as the somatic cell hybridization research department, and electronics industry for fine filtration of high-purity water.

Information Of Sterilized Syringe Filter

Operating Method Of Membrane Filter

The microporous filter membrane is a kind of macromolecule membrane material, which has many uniform micropores, and its pore size varies from 0.025 to 14 micron. Its filtration mechanism is mainly physical screening. There are many kinds of microporous membranes, such as cellulose acetate, polypropylene, and polytetrafluoroethylene.

The advantages of microporous filter membranes are high porosity, fast filtration speed, small adsorption, no retention of drug solution, no influence on drug content, simple equipment, easy removal, etc. The disadvantages are poor acid and alkali resistance, poor adaptability to some organic solvents such as propylene glycol, and the retained particles easily block the filter membranes and affect the filtration rate. The membrane can be used only after other filters have been preliminarily filtered.

Microporous filtration membranes are divided into organic membranes and water membranes. Organic membranes can pass through aqueous solutions, while water membranes can not pass through organic solutions.

There are different aperture specifications. One has a smooth surface, and some have no positive and negative sides. In general, 2,3 ml of primary filtrate is discarded before filtration, so as not to interfere with the detection of filter membrane impurities. After the steps of filtration, the adsorption of drugs on the lower filter membrane was investigated.

Operating Method Of Membrane Filter

The Composition And Application Of Filter Paper

Most filter papers are made of cotton fibers and are made in different ways for different purposes. The key component of filter paper is cellulose. The pigments are a capillary function of cellulose.

The liquid rises along with the filter paper and shows very significant color bands: green is chlorophyll, yellow is lutein, and orange is carotene. Filter paper filtration is actually a chromatographic function. In experiments, the filter paper is used together with filter funnel and Brinell funnel.

Because its material is made of fibers, there are numerous holes on its surface for liquid particles to pass through, while larger solid particles can not pass through. The filter paper has good filtration and absorption performance and high compressive strength.

At present, the filter paper is mainly used in petroleum, pharmaceutical, industrial oil, industrial organic suspension to separate solid and semi-solid impurities. The filter paper is mainly used in the ashing weighing analysis test after filtration. The ash weight of each filter paper after ashing is a fixed value, while the qualitative filter paper is used in the general filtering function.

The Composition And Application Of Filter Paper

Types of Bottle-Top Dispenser

Currently, bottle-top dispenser provided by Hawach falls into two types: mechanical bottle-top dispenser and electronic bottle-top dispenser. Both of them are made of optical glass, Al2O3，ETFE， PFA， FEP， PTFE, platinum-iridium alloy and PP(HARD HAT), so the quality is superb and chemical resistance is excellent.

Types of Bottle-top Dispenser

These two types of products have their own advantages and disadvantages, and you can choose different types according to different need. Compared with electronic bottle-top dispenser, the mechanical bottle-top dispenser has a lower price and fewer limits, it can be applied to wider application areas.

On the contrary, the electronic bottle-top dispenser has reduced human factors and less repeated strain damage, it is more suitable for batching process with higher standards. The volume range of both products are different, mechanical types are from 0.5mL to 50mL, electronic types are from 0.1 to 99.9mL.

Matters Needing Attention
1. Prohibited solution: liquid reacting with ETFE, FEP, PEA, PTFE, Al2O3; Liquid corroding Optical Glass; liquid catalytic decomposition of platinum-iridium alloys; explosive liquid and suspension.
2. Restricted solution: concentrated hydrochloric acid, nitric acid, chlorinated hydrocarbons, FLUOROHYDROCARBONS, and precipitate-forming liquid.

Types of Bottle-Top Dispenser

Characteristics And Application Of Cellulose Extraction Thimble

Hawach cellulose extraction thimble is commonly known as Soxhlet extraction thimble or paper extraction thimble. It is made of high-quality cellulose long fibers and cotton linter with highly innovative technology.

Features

One of the most prominent features of the cellulose extraction thimble is its outstanding mechanical strength and retention ability. It could undertake the temperature up to 100 degrees. Also, its uniform and consistent pore size guarantee high throughout. It is suitable for a wide range of applications with most Soxhlet extraction systems, solvent extraction or other similar extraction applications. Undoubtedly, there are various sizes and wall thicknesses of the thimbles available provided for customers’ selection.

Application

The cellulose extraction thimble is commonly used as a safe, convenient and efficient extraction tool for the solid and semi-solid materials. It can hold solid samples that are to be leached and be placed in a clean environment with a sufficient amount of solvent (usually organic solvent).

In this way, the leachable components in the sample can be extracted by being dissolved in the solvent samples in advance. In particular, it holds an important position in the food industry for the determination of fat and pesticide residues.

Characteristics And Application Of Cellulose Extraction Thimble

Application Of QuEChERS

QuEChERS method is widely used in global countries to extract and purify samples not only for vegetable agricultural products such as fruits and vegetables, but also for animal foods such as chicken, tilapia, and various foods with high sugar content (such as honey, French fries, biscuits and chocolate etc.) which are processed by complex processes. The detection methods are various and the combination of instruments is emphasized.

In addition, the QuEChERS method is widely used in various detection methods abroad because of its good extraction effect, high fidelity, and thorough purification. The target substances extracted are not limited to pesticides, and the detection instruments used are not limited to conventional gas-liquid chromatography.

M.Bustamante-Rangel and others were extracted by QuEChERS method (adding citric acid sodium citrate slow-release agent to regulate pH value). The content of isoflavones (a soybean secondary metabolite) in solid bean products was determined by capillary electrophoresis electrospray ionization mass spectrometry (CE-ESI-MS). The recovery rate was 91%, 109%, and the relative standard deviation was 11%.

Application Of QuEChERS

Type And Characteristics Of Vacuum Filtration

Vacuum filtration is one of the most widely used filtration methods in theory and practice. It is used to separate the filtrate by causing a certain degree of negative pressure (vacuum) on the filter medium side. It features in large productivity, the high degree of automation and suitable for large-scale continuous production. It can run continuously, it is easy to control running parameters. Besides, it has the advantages of high filtration efficiency and good effect, compact structure, long service life, convenient installation, and simple operation and maintenance.

Types of Vacuum Filtration
Vacuum Filtration provided by Hawach includes glass and stainless steel, concretely speaking, they are diaphragm vacuum pumps, glass solvent filters, glass vacuum filtrations, and stainless steel vacuum filtration.

Diaphragm vacuum pumps fall into two categories: anti-corrosion diaphragm vacuum pumps and standard diaphragm vacuum pumps. Glass solvent filter falls into 300ml glass solvent filters and 500ml glass solvent filters. Glass vacuum filtration falls into one-branch, three branches or six branches glass vacuum filtrations; stainless steel vacuum filtration falls into One-branch, three branches or six branches stainless steel vacuum filtrations.

Property of Vacuum Filtration
Vacuum Filtration provided by Hawach is characterized by high temperature and corrosion performance, high work efficiency, and excellent quality.

Type And Characteristics Of Vacuum Filtration

Using Pipette Transferring A Few Ul Of Valuable Reagents

A tip dispensing method: not suitable for volatile, toxic reagents.

(1) Adjust the knob to the desired scale position, insert the tip, press the finger to the first section, and the tip of the tip contacts the reagent. Slow suction, after removing the liquid level, slowly press the first stage and press firmly to the second stage to press the reagent out.

(2) Finger pressure to the first segment, tip contact reagent, slowly sucks out the liquid.

(3) In the target container liquid, press the reagent to the second stage, pay attention to the same force as A, and also pay attention to the reagents do not splash around.

(4)Slowly return to the first segment and repeat the above operation.

Method for transferring a few ul of valuable reagents:

(1) With the above (1)-(4), after removing the liquid surface, lightly press the inner wall of the container a few times to allow the outer wall liquid to flow down. The white pipette tip goes below the liquid level of 1 mm, which is the most important.

(2) The pipette tip is immersed under the liquid level of the target container and slowly pressed to the first stage.

(3) Loosen, return to the first stage, re-inhale the liquid, repeat 4-5 times, and wash the liquid inside the tip.

(4)Move the tip of the pipette out of the liquid surface and gently lean against the inner wall to press out the liquid to the second stage.

Using Pipette Transferring A Few Ul Of Valuable Reagents

Honey Analysis SPE Cartridge (C18 And SCX Samples Available)

The solid-phase cartridge is made from medical grade PP housing and the 100,000-grade clean room packed sorbent, with higher recovery rate. The application of the cartridge can be related to food, beverage, honey, environment, biological analysis and medical.

We special supply the C18 and SCX SPE cartridge to our customer who is a famous honey exporter in Argentina, they used our cartridge when their QC part of the honey analysis, pesticide residue determination in honey. And some other customers use of determination of Amantadine Residue in honey by Solid-phase Extraction method would try MCX and C18A in their application.

Related Product Information:
SLSPE5006C18A(SPE Cartridge, C18A, 75μm,60Å, 500mg/6mL,30pcs/pk)
SLNY1345NG(Non-sterile Nylon Syringe Filters, 0.45(μm), 13(mm), GF prefilter, 100pcs/pk)
1000-5000μl pipette
SLSPE2006SCX (SPE Cartridge,SCX, 40-75μm,70Å, 200mg/6mL, 30pcs/pk)
Mechanical Bottle-Top Dispenser, 2.5-25mL
Advanced Plus Mechanical pipette, 20-200μl, Autoclavable

Any more questions, please contact our sales department at info@hawach.com

Honey Analysis SPE Cartridge (C18 And SCX Samples Available)

Effect of Elevated Temperature On HPLC Columns

Generally speaking，with the increase of temperature, the viscosity of the mobile phase decreases. The situation will lead to an increase in the transfer rate of the substances. Thus the chromatographic separation effect will be better than before.

Although the separation effect has been improved, the temperature in the meantime affects retention factor (k) and selectivity (a). Those factors may improve the resolution or reduce it.

The retention time tends to decrease with the increase of temperature. The analyte will tend to stay in the mobile phase at high temperature and elute faster. And the different compounds may also have different degrees of retention for temperature.

Certainly, one advantage of increasing temperature is that the HPLC column pressure during operation is reduced so that we can use larger column flow and finer packing.

The other factor influencing the separation effect of HPLC columns is the thermodynamic mismatch of the mobile phase.

If the HPLC column operates at 60℃, and the mobile phase flows into it at the room temperature, then the relative cold mobile phase will cause the deformation of the peak. The analyte tends to be in the mobile phase with high temperature.

Effect of Elevated Temperature On HPLC Columns

Key Points For Attention In Membrane Filter Operation

In the application of membrane separation technology, the microporous membrane filter is one of the most widely used membrane species. Its use is simple and fast, and it is widely used in many fields such as scientific research, food detection, chemical industry, nanotechnology, energy, and environmental protection.

(1) Selection of microporous membrane filter. According to the solvent to be filtered, the appropriate material and specification of the microporous membrane were selected to open the packaging in the clean area. For example, if the solvent to be filtered is strong acid or alkali, the PTFE microporous membrane is selected.

(2) Check the selected microporous membrane filter. After selecting the filter membrane, carefully check whether there are holes, cracks and foreign bodies on the membrane. Due to the improvement of the fabrication process of microporous filter membranes, the quality of microporous filter membranes, whether domestic or imported, is better, and the above situation will not occur.

(3) immersion of microporous membrane filter. Rinse the microporous membrane with distilled water several times before it is put into the water for injection for one day so that the microporous membrane can achieve the best results.

Key Points For Attention In Membrane Filter Operation

Cleaning Methods Of Stainless Steel Filter Cartridge

By using stainless steel fiber sintered felt web and stainless steel is woven mesh as the main filter medium, the stainless steel filter cartridge provides a great convenience for lots of experiments with large filtering area and high filtration efficiency. To keep its superior performance, it is necessary to maintain the filter cartridge periodically. Therefore, here are several cleaning methods provided below.

Ultrasonic Cleaning Method
This cleaning method employs the longitudinal wave as the cleaning liquid to generate a certain number of small enough vacuum bubbles. These bubbles will burst when they cannot withstand the pressure, whose impact force would be used to achieve the cleaning process of the stainless steel filter cartridge.

Reverse-water Cleaning Method
The reverse-water cleaning method sometimes referred to as the backwashing method, utilizes the inert gas, such as nitrogen, to backwash the stainless steel filter in its opposite direction.

Solution Cleaning Method
The solution cleaning method is to soak the stainless steel filter cartridge with a 5% sodium hydroxide solution or nitric acid solution for an hour. According to its degree of contamination, the soaking time can be extended or shortened. Finally, just dry it naturally with clean air.

Cleaning Methods Of Stainless Steel Filter Cartridge

Installation And Maintenance Of Flash Column

Flash column from Hawach Scientific features in high compatibility, safety, and flexibility, most of them can be used for separation of different compounds with good flow distribution. Customized packing and clean package make the super clean environment and better shipping cost, high purity packing material ensures excellent separation efficiency, average pore size offers excellent flow rate, fine design enlarges load capacity and high recovery rates, and tight particle-size distribution avoids leaching and channeling.

Installation of Flash Column
Flash column supplied by our company is convenient for manual assembly, there are some tips for installation and usage. The whole equipment consists of several parts, including screw cap, frits, tips, O-ring, and end tips and disbursing unit. Luer-lock end fittings are compatible with any flash system, end fittings keep media from moisture, polyethylene frits prevent media from leaking, as well as allow the mobile phase to pass through. More details can be referred to instructions or communicated to our office.

Maintenance of Flash Column
Flash column designed by Hawach Scientific is of transparency appearance and smooth interior wall, these properties enable customers to clean flash column easily and completely. And each part can be dismantled and separately stored, thus contaminated risk is greatly reduced.

Installation And Maintenance Of Flash Column

Laboratory Sapmle Vial Specifications Product Introduction

Screw thread top sample vials have excellent chemical stability, sealing and corrosion resistance, and are available in both transparent and amber.

The cap of sample vial has a solid lid and a perforated lid, which can be divided into black and blue. This series of products are designed and manufactured in full accordance with US EPA requirements.

The septa of sample vial use high-quality materials to ensure its good function, ensuring that the septum does not fall into the vial during storage. The chemically inert cap produced by this method combines the septum and the plastic lid at the molecular level to avoid excessive evaporation and maintain proper sealing of the vial.

Laboratory sample vial specifications: The storage sample vial series’ caps are made from high-quality polypropylene, combining innovation and time-saving convenience. The chemically inert cap produced by this method combines the septum and the plastic lid at the molecular level to avoid excessive evaporation and maintain proper sealing of the vial.

Laboratory-specific vial specifications
Capacity: 20ml: 40ml, 50ml, 60ml
Material: Hydrolyzed glass (UPS1)
Color: transparent, amber
Septa:PTFE/Silica Gel/PTFE, PTFE/Silica Gel, PTFE

Laboratory Sapmle Vial Specifications Product Introduction

Performance Characteristics And Selection Of Syringe Filter

Syringe filter is a fast, convenient and reliable filter tool commonly used in laboratory. It has beautiful appearance, light weight and high cleanliness. It is mainly used for sample pre-filtration, clarification and sterilization of particles, liquids and gases. Syringe filter is a method for filtering small samples of high performance liquid chromatography and GC.

Generally, syringe filters are ready-to-use and do not need to be changed and cleaned. They can easily purify or sterilize various solutions, including cell and microbial media, reagents and additives, protein solutions and buffers.

Performance characteristics of Syringe filter
1. Beautiful and light appearance;
2. High cleanliness;
3. Various specifications and packaging;
4. Excellent economy and low cost;
5. Easy to use, precise and reliable.

Factors to be Considered in Choosing Syringe Filter
1. Quality: Since it's sterilization, we certainly hope that syringe filters can remove as many bacteria as possible without introducing other substances, such as bacterial endotoxins or chemical precipitates.
2. Filtration membrane: There are many kinds of filter membranes used in syringe filters. We should consider both chemical compatibility and filtration time when selecting them.

Performance Characteristics And Selection Of Syringe Filter

How To Solve The Leakage Of HPLC Column?

1. Leakage at joint
Generally, it can be solved by tightening, cleaning and replacement.

2. Pump leakage
Check whether the one-way valve and joint are loose, if loose and tightened (not too tight), check whether the seal of mixer and pump is damaged;

3. Leakage of injection valve
Check whether the rotor and seal of the injection valve are loose, tighten if loose, check whether the waste liquid pipe is blocked or siphoned, dredge or replace the waste liquid pipe, and keep the waste liquid pipe higher than the waste liquid level.

4. Leakage of HPLC column
The tail end joint is loose and tightened; there are fillers in the clamp sleeve, remove the clamp sleeve, clean the clamp sleeve and re-install it; the sieve plate thickness is not appropriate, and replace the appropriate sieve plate.

5. Detector leakage
Check whether the gaskets and windows of the circulation pool are damaged, replace the gaskets or windows; check whether the circulation pool is blocked, replaced or reinstalled; check whether the waste liquid pipe is blocked and replace the waste liquid pipe.

How To Solve The Leakage Of HPLC Column?

Application Fields Of SPE Cartridges

The technique used by SPE cartridges is a versatile pretreatment technique, which can be divided into four kinds according to the principles: RP-SPE, NP- SPE, IE- SPE, and absorption.

At present, SPE cartridges are mainly used in the fields of food safety, drug research, environmental protection and pesticide residue analysis in agricultural products.
1. Analyze residues of various antibiotics and antibacterial drugs in various food species;
2. Analyze pesticide residues in agricultural products;
3. Analyze illegal and legal additives in various kinds of food;
4. Widely used in pharmacokinetics analysis;
5. Analyze organic matter in drinking water.

In the application of specific experimental work, SPE cartridges need to choose appropriate packing and specification according to the analysis object, detection means, and reasonable laboratory conditions.

The extraction capacity of SPE cartridges on the analyzed objects, the volume of the sample solution, the final volume of the elution solution, and the total amount of the measured and disturbing objects in the sample solution should be considered.

The packing of SPE cartridges:
CNWBOND Carbon-GCB, Coconut Charcoal, Silica, Florisil PR, Alumina, HC-C18, LC-C18 and so on.

Application Fields Of SPE Cartridges

The Cleaning Methods Of Vacuum Filtration

Vacuum Filtration is a common instrument in the laboratory. This paper briefly introduces the cleaning method of sand core filter bottle in vacuum filtration. Sand core filter bottle is an important part of laboratory filtration, and many customers often encounter cleaning problems when using sand core filter bottle.

Conventional cleaning methods mainly include the following:

Soak in acidic solvents: The advantage of this method is that the particulate matter blocked in the filter gasket can be melted, but the discoloration of the filter gasket can not be effectively improved. And the effect of cleaning is uncertain.

High-pressure water gun flushing: Through strong water pressure, the particulate matter blocked in the filter element can be washed out, but this method is effective for Jiangwei.

Ultrasound cleaning machine cleaning: is also a physical cleaning method, the effect is better than high-pressure water gun cleaning, but for color contaminated filter element has no effect. At the same time, customers need to purchase the equipment.

In summary, all kinds of methods of cleaning filter element have certain limitations. Once the filter element is polluted, no matter how to clean it, it can not restore the performance of the factory.

The Cleaning Methods Of Vacuum Filtration

The Characteristics and Application of Syringe Filter

Syringe filter can be used in the analysis of high performance liquid chromatography and IC. It is an important step in sample pretreatment to filter sample solution and remove impurities in the solution so as to prevent impurities from clogging the chromatographic column.

Application fields of syringe filter:

1. Filtration of aqueous and organic phase solutions in Educational and Commercial R&D Laboratories;
2. Environmental air, waste gas and water quality analysis;
3. Detection and analysis of raw materials, finished products and semi-finished products of food, beverage and medicine;
4. Microelectronic semiconductor, chemical industry, cement/mineral analysis, etc.

In addition, it is a fast, convenient and reliable filter tool commonly used in the laboratory. It has beautiful appearance, light weight and high cleanliness.

Specific features are as follows:

1. The structure of the filter housing is precise and the design is reasonable, which ensures the smooth filtration.
2. Using filter membrane, the flow rate is fast, the pressure resistance is stronger, and the damage is not easy.
3. The built-in filter membrane has uniform pore size, high porosity, high filtration accuracy and very low residual rate, which reduces the waste of samples.
4. The interface is more tightly connected and convenient to use.

The Characteristics and Application of Syringe Filter

Types Of Three Sample Vials

The sample vial is a device which is widely used in chemical and medical fields. Currently, sample vial provided by our company falls into three types: screw top sample vial, crimp top sample vial and snap top sample vial.

All of them provides with good quality and excellent chemical resistance and fits for almost all the chemical solvents. These three kinds of sample vial are meticulous in design and strict in quality control, which ensures auto-sampler operates seamlessly and avoids contamination of samples.

Types of Sample Vial

Screw top sample vial, crimp top sample vial and snap top sample vial are all well compatible with various auto-sampler and consistent in quality between batches. All three kinds of bottles are designed in clear and amber to better meets different needs. Screw top sample vial is low extractable, but its unique thread design guarantees a permanent and firm seal. Crimp top sample vialuse certified crimp caps to ensure the good sealing property of the sample. Compared with crimp caps, snap top sample vial are more convenient in operation due to its unique snap design.

Types Of Three Sample Vials

Application and Description Of Flash Column

Hawach Scientific provides a wide selection of flash columns, they are a quick and easy way to separate complex mixtures of compounds, and often used on a preparative scale to provide better separation and cuts down on the amount of time required to run column. We committed to providing a good performance flash column, featured in clean column, clean packing, excellent column pressure, and wide compatibility. And dedicate flash column design is convenient for manual assembly and stacking, a wide range of specifications is satisfying different purifications. Flash columns are all passed the ISO9001 certification, ensured column efficiency, and provided with flexibility and free leakage.

Application of Flash Column
Hawach Scientific provides flash column for customers in a wide range of sizes and specifications, including standard Silica gel, Superior Silica gel, Spherical C18, Irregular C18, Spherical NH2, Spherical C4, Spherical C8, Spherical CN, Spherical HILIC, Neutral Alumina, Spherical Phenyl, Spherical SAX, Spherical SCX, Spherical C8, Spherical Diol and so on.

Manufactured with the use of superior quality materials and progressive techniques, these flash columns are easy and quick to install without any requirement of tools. High purity PE frit ensures mobile phase pass through without corrosion, strong retention ability is fit for the non-polar compound or analysis of pesticides in food additives and contaminants.

Application and Description Of Flash Column

Product Features And Uses Of PES Capsule Filter

The capsule filter, also known as the integral filter, uses a folded inlet filter membrane with a large filtration surface area and is suitable for filtration of larger volume solutions.

The filter material is PES/NY/PTFE/PVDF/PP/GF/PS, and polypropylene is used as the support & outer casing, using hot-melt welding (without binder) sealing technology.

The outer polypropylene material of this filter, free of adhesives and other chemicals, ensures no contamination of the sample. The hydrophilic polyethersulfone microporous membrane used in the polyethersulfone (PES) capsule filter has good chemical compatibility and biosafety. High rejection, low extraction, and very low protein adsorption.

product features

Completely biosafety, non-toxic
100% integrity test
Made in a clean environment and kept clean
Available in a variety of apertures

Product Usage

Tissue culture medium filtration
Drugs, cosmetic products, food, and beverage filtration
Remove bacteria or submicron particles
Purification of water, chemicals, and reagents

Product Features And Uses Of PES Capsule Filter

Notices for Membrane Filter Operation

（1）In order to protect and prolong the service life of the filter membrane, filter paper or silk cloth of the same size can be placed on the filter membrane to prevent the rupture of the membrane filter.

（2）Measuring the foaming point: Measuring the pressure of the foaming point can reflect the pore size of the sterilized microporous filter membrane, which is closely related to the quality of the filtered liquid and an important means to ensure the quality of the sterilized microporous filter membrane.

（3）The sterile microporous membrane filter used should be immersed in water for injection at about 70 ~C for 1 hour in advance. After the water is poured out, the microporous membrane should be immersed in warm water for overnight reserve. When it is in use, it should be taken out and washed with water for injection, and then it can be put into the filter for use.

（4）The aperture is conical, the smooth side is small for the front, and the rough side is large for the reverse. When installing, the front (smooth side) should be facing up and the reverse (dark side) should be facing down.

Notices for Membrane Filter Operation

How To Ensure Accuracy During The Use Of A Pipette

Replace the pipette tip method: the most accurate.

(1) Adjust the knob to the desired scale position, tips: First, it can be slightly more than some, then turn back to the scale. Be careful not to exceed the maximum scale to avoid human error.

(2) Insert tip: When aseptic operation, pay attention to the action is fast and correct, can not touch the tip by hand, the intensity of the action should be consistent, prohibiting waste action. For normal operation, use the thumb-index finger to tighten, but the hand can’t touch the tip of the pipette.

(3) Finger pressure to the first stage, pipette tip contact reagent. The white tip enters the liquid surface 1 mm, the yellow tip 2-3 mm, and the blue tip 2-4 mm to avoid errors caused by the influence of hydraulic pressure.

(4) Slowly aspirate the reagent, prohibit the speed too fast, and the liquid enters the tip.

(5) After removing the tip, first gently lean against the inner wall of the container to allow the liquid on the outer wall of the tip to flow down.

(6) Stick the tip on the inner wall of the target container, gently press it to the first section and press out the liquid.

(7) The tip slides slightly on the inner wall of the container, retaining a small amount of liquid at the tip, removing the target container, and removing the tip from the finger, taking care not to spill the reagent.

How To Ensure Accuracy During The Use Of A Pipette

The Characteristics Of QuEChERS

QuEChERS is the latest developed rapid sample pretreatment technology for agricultural products detection in the world in recent years. Because of its fast, simple, inexpensive, effective, reliable and safe characteristics, it has become a new sample pretreatment technology of great concern. Its characteristics are as follows:

(1) The recovery rate is high. The recovery rate of a large number of polar and volatile pesticide varieties is more than 85%.
(2) High accuracy and accuracy can be corrected by internal standard method.
(3) Analysable pesticides have a wide range, including polar and non-polar pesticides, which can be used to obtain a better recovery rate.
(4) The analysis speed is fast and six samples can be processed within 30 minutes.
(5) Solvents are less used, less polluted, cheaper and do not use chloride-containing solvents.
(6) It is easy to operate and can be accomplished without good training and high skills.
(7) When acetonitrile is added to the container, it is sealed immediately, which reduces the contact with the staff.
(8) Few glassware was used in sample preparation, and the device was simple.

The Characteristics Of QuEChERS

The Operating Steps Of Vacuum Filtration

The specific Operating steps of vacuum filtration are as follows:

1. The whole set of filter bottles should be cleaned before use, washed with clean water several times after cleaning with a washing machine, and finally washed with distilled water. If the sterility test is needed, the whole set of filter bottles can be sterilized under high temperature and pressure before use.
2. Installation methods are detailed in the previous section.
3. Pour the sample to be filtered after installation.
4. Connect the connecting hose to the vacuum pump.
5. Open the vacuum pump and start filtering. When filtering, we should pay attention to the pressure and speed not too fast. Otherwise, it is easy to cause membrane damage.
6. The liquid in the collecting bottle should be handled in time. Otherwise, the liquid in the collecting bottle will be sucked directly into the vacuum pump and the vacuum pump will be damaged.
7. Close the vacuum pump of the vacuum suction device in time after the filtration, especially when the filter membrane is blocked after the filtration, the suction bottle should not be sucked for a long time.

The Operating Steps Of Vacuum Filtration

Knowledge Of Extraction Thimbles

Introduction of Extraction Thimbles
Currently, extraction thimble is often designed to adsorb solid matter and extract medium substance, and also applied to the analysis of air and exhaust gas. Extraction thimble provided by Hawach Scientific selects high-quality materials and adopts innovative technology, which provides with uniform porosity, stable and strong quality, fixed and accurate size, high mechanical strength and good retention force. It is a safe, convenient and effective solid and semi-solid material extraction.

Features of Extraction Thimble
Due to various models and wall thickness, it is suitable for a variety of applications with most Soxhlet extraction design. It is also used to hold solid samples and fits for providing a completely isolated and fully contact environment for the solvent and sample. The quality has reached the testing standard, and it has lower experimental cost and improved efficiency. The whole operation process is simple because extraction units minimize the hands-on time and ensure complete extraction. Additionally, compared with traditional extraction thimbles, it provides better permeability and longer service life. All products are made of environmentally friendly materials, which occurs no contamination in operation, and it causes no pollution for the environment or samples.

Benefits of Extraction Thimble
Extraction thimble provided by Hawach Scientific has been proven for its purity, consistent high quality and absolutely seamless. It is a widely used technique for the analysis and determination of fats or pesticide residues in foods products and soil materials and many other procedures that involve a solid-liquid extraction. And extraction thimble is suitable for prefiltration of gases and analyzers because of low heavy metal content and few additives. Besides, it has other benefits, such as competitive process, fast delivery time, and good external presentation. The high purity of the material ensures reliable and reproductive analytical results.

Application of Extraction Thimble
Extraction thimble provided by our company are all produced in a clean room, which prevents pollution from the source, and smooth interior surface makes it easy to clean. In terms of flow pressure, glass fiber extraction thimble can reach 20mmhg, DOP retention is up to 99.99%, weight loss is less than 0.2%, wall thickness is from 1.5 to 2.0mm. Although cellulose extraction thimble is not fit for strong acids and temperature above 120 degrees Celsius, it is suitable for all available extraction systems, such as Soxhlet-type, Tecator-type or similar devices.

Knowledge Of Extraction Thimbles

The Characteristics Of Bottle-Top Dispenser

With the increasing difficulty of detection and the increasing requirement of detection, a large number of analytical instruments have entered the laboratory, and bottle top dispenser is one of them. The characteristics of the bottle top dispenser are described in detail below.

1. Bottle top dispenser is a small laboratory liquid transfer equipment developed for some strong acids and alkalis, Aqua regia, HF and various organic solvents.
2. This product reflects the high quality, performance and reliability requirements of plastic factories.
3. High-quality Teflon material makes the product more durable and resistant to strong acid and alkali. It is special equipment for a special solution and reagent transfusion.
4. Manual operation, the experimenter can easily control the flow of liquid.
5. Bottle mouth and bottle top dispenser have good sealing performance, the liquid does not leak; inside and outside wall is smooth, easy to clean, not easy to have liquid residue, can be cleaned in boiling nitric acid.
6. This product is all made of Teflon material, which avoids the metal element mixing and improves the accuracy and tightness of the experiment.

The Characteristics Of Bottle-Top Dispenser