2019年5月30日星期四

The Selection and Sample Loading Mode of Flash Column

The Selection Principle of Silica Gel Column

Commonly, the maximum sample loading volume of a silica gel column is about 1/20 of the volume of the column’s silica gel. However, as a practical matter, specific sample loading volume should be decided by each constituent’s degree of separation and solubility.

Wet Process Sample Loading

Generally, when the samples have good solubility, laboratory workers can perform wet process sample loading. Wet process sample loading has the characteristic of easy and less loss. One thing which has to be noticed is that the solvent for wet process sample loading must be a low polar eluting agent or with a low percentage of a polar solvent. Otherwise, the constituents will be easily eluted. What is more, the volume of the solvent should not be more than 10% of the flash column’s volume.

Dry Process Sample Loading

Laboratory workers normally use dry process sample loading to process most samples. The thing to notice is the choice of volume and specification of silica gel. The volume of silica gel is one to two times of the sample, and the specification is always with the mesh number of 200 to 300. But when the sample is hard to be mixed evenly and dryly, you should choose silica gel with the mesh number of 100 to 200.

PP Membrane Pleated Filter Cartridges

Polypropylene folding filter has the characteristics of high flow rate and high dirt absorption. It is the most economical pre-filter filter and is widely used in various fields such as pharmaceutical, electronics, chemical, food, and beverage.
Filter characteristics
Ultra-fine nanofiber filter, no fiber shedding
High efficiency, high flow rate, high dirt capacity
Conforms to US FDA CRF title21 and EU 1935/2004EC
Special structural design with nano-drainage layer to ensure excellent filtration
Work performance
Working temperature: Normal <55℃, Max< 80℃
Working pressure difference: 4.2bar/25℃;2.1bar/25℃filter specification
Standard sizes: 10”, 20”, 30”, 40”
Filtration accuracy: 0.1μm、0.2μm、0.45μm、0.65μm、1.0μm、2.0μm、3.0μm、5.0μm、10μm、30μm、40μm、50μm、70μm、100μm
Typical application
Pre-filtration and fine filtration of process water
Security filtration of reverse osmosis water treatment process
Pre-filtration and precision filtration of mineral water
Pre-filtration of infusion, biological products, high viscosity liquids
High-precision filtration of food, beverages such as beer, wine, and liquor
Especially suitable for high suspension particles such as photoresist, ink and fermentation broth

Brief Introduction of Anti-Corrosion Diaphragm Vacuum Pumps

All the parts of anti-corrosion diaphragm vacuum pumps in contact with the gas are all PTFE materials, whose noise is less than 50dB and minimum vacuum pressure is up to 2mbar.
Anti-corrosion diaphragm vacuum pumps are suitable for dealing with corrosive gases for chemical, pharmaceutical and petrochemical industries and so on, such as vacuum filtration, vacuum distillation, rotary evaporation, vacuum concentration, centrifugal concentration, solid phase extraction and so on.
Features of anti-corrosion diaphragm vacuum pumps
1. High-cost performance;
2. Long service life and high efficiency;
3. Unique structure design;
4. A variety of models for choosing;
5. Meet the various needs of the laboratory.
Overheat save the design of anti-corrosion diaphragm vacuum pumps
If the body temperature is too high, it will automatically shut down, and when the temperature returns to normal, it will automatically start up the work to ensure the stability and safety of the system.
Application of anti-corrosion diaphragm vacuum pumps
1. Vacuum flaw detection, measurement and detection;
2. Solid phase extraction;
3. Vacuum drying, centrifugal concentration;
4. Vacuum waste liquid suction;
5. Vacuum filtration;
6. Vacuum distillation.

Brief Introduction of Anti-Corrosion Diaphragm Vacuum Pumps

Learn About Hawach Extraction Thimbles

As a safe convenient and efficient method of solvent extraction of solids and semi-solids, the extraction thimbles are widely used in Soxhlet extraction units. Their purity and consistent high quality have been proven by scientists in the lab. Soxhlet extraction is a common technique for the analysis of many procedures which involve the solid-liquid extraction.
Our products of extraction thimbles are available in cellulose extraction thimbles and glass fiber extraction thimbles. Cellulose extraction thimbles can be used in general Soxhlet extraction. Glass fiber extraction thimbles are suitable for application if cellulose extraction thimbles are not suitable, such as temperatures above 120℃ and strong acids. Glass fiber extraction thimbles are widely used in air and waste gas analysis for collecting solid particles.
Upon your application, you have a wide selection of extraction thimbles with consistent wall thickness, super mechanical strength and retention ability. Their high porosity ensures fast flow for most all the extraction systems.
DOP Retention of our cellulose extraction thimbles is up to 99.8%, and the maximum temperature is 100℃. Hawach glass fiber extraction thimbles can be used when the solvents are not compatible with cellulose ones. And the maximum temperatures are 500°C.

Operating Tips for Bottle-top Dispenser

This article describes the tips for using the bottle-top dispenser to help you increase your experiment efficiency and extend the life of the bottle-top dispenser.
1. Install the drain pipe and the intake pipe to make the nozzle straight into the valve, tighten the nut, avoid violent installation and insert the nozzle into the valve.
2. Before each use, it is necessary to ensure that the intake and drain valves and all valves are properly installed and tightened to avoid splashing of piston movement.
3. Drainage ensures that the drainage pipe is not directly directed to the operator to ensure safety.
4. When discharging liquid, control the piston to move slowly and uniformly. Use appropriate container to receive the liquid and let it go down the wall.
5. When discharging fluid, stop immediately and do not operate violently in order to avoid further damage to the instrument.
6. After the instrument is used, please fasten the safety cap of the drain pipe to prevent the dropping of the liquid at the outlet of the drain pipe due to gravity or water vapor in the air.
7. After using the instrument, please rotate the calibration adjustment ring to the “0” position to ensure safety.
8. The suitable temperature for the operation of the bottle mouth separator is 4-50 C.

Operating Tips for Bottle-top Dispenser

Instructions of Filter Paper

General Description
During the experiment, filter paper is usually employed with other filters like the Brinell Filter. The filter paper should be folded into a suitable shape first, and a common folding method is shaping the filter paper into a flower-like one.
The higher degree the folding filter paper possesses, the larger surface area it can provide,and the better the filtering effect would be.
Attention:Excessive folding will crack the filter paper, so a drainage glass rod needs putting on the multi-layer filter paper with well-proportioned force to avoid the breakage of the filter paper.
Operating Procedure
STEPOPERATION
1Fold the filter paper into a circular corner of a 90-degree angle.
2Unclose the folded filter paper to a funnel shape.
3Place the shaped filter paper in the filter, and pour some purified water from the mouth with the wet filter paper close to the inner wall. Then pour out the remaining water for later use.
4Place the funnel on the rack.
5Fill the funnel with sample liquid.
6Check that the liquid is poured along the wall to the bottom.

Brief Introduction of Partition Chromatography

Principle of partition chromatography:

Partition chromatography utilizes the difference in solubility of the components to be separated between the stationary phase and the mobile phase to effect separation. The stationary phase for partitioning the chromatogram is generally a solvent in the liquid phase, which is distributed on the column or the surface of the support by means of a pattern, bonding, adsorption, or the like. The process of partitioning the chromatogram is essentially the process by which the constituent molecules continue to reach a dissolved equilibrium between the stationary phase and the mobile phase.

The stationary phase of partition chromatography:

The carrier for liquid-liquid partition chromatography mainly includes silica gel, diatomaceous earth, and cellulose. Generally, when a water-soluble component or a relatively polar component is separated into a compound such as an alkaloid, a glycoside, a saccharide or an organic acid, a strong polar solvent such as water, a buffer solution or the like is used for the stationary phase, and weaker polar organic solvent such as chloroform-ethyl acetate or butanol are used for the mobile phase, so it is called normal phase chromatography; 
However, when separating a fat-soluble compound, such as a higher fatty acid, a fat or a free steroid, the two phases can be reversed, and the stationary phase can be used Paraffin oil, while the mobile phase is a strong polar solvent such as water or methanol, so it is called reversed phase partition chromatography.

2019年5月29日星期三

Advantages of Flash Column

Flash column product advantages:

1. Dissolution of impurities: All the materials used are medical grade PP and PE, which have strong corrosion resistance and low impurity content, therefore the dissolution probability of impurities is low.
2. There are many series of adsorbents, and there are different types of adsorbents imported and made in China. In addition, the specifications are diverse, which facilitates the choice of price-sensitive customers, quality-sensitive customers and customers in different application fields.

The similarities and differences between Flash column and SPE column:

All of them are separated in sample pretreatment.
The difference is that the flash column is a fast separation column. It needs to be used with certain instruments. In addition, when it is used, the upper interface will generally introduce gas/liquid (with a certain pressure) to speed up the sample separation process.
SPE column uses gravity to flow down by itself or SPE column solid phase extraction device to accelerate the separation speed by vacuum extraction.
Flash column is mostly used in organic synthesis and industry (in industrial preparation, large pillars with heavy fillers will also be purchased for use). While SPE column is often used in the pretreatment of small samples in the laboratory.

Features and Applications of Nylon Filter Membrane

In the application of membrane separation technology, the microporous membrane is the most widely used membrane variety, and it is simple and quick to use. It has large gas flux, high particle retention rate, good temperature resistance, strong acid resistance, strong alkali, organic solvent and oxidant, anti-aging and non-stick, non-combustible and non-toxic, and good biocompatibility. The material is divided into two categories: organic and inorganic.
In view of the separation characteristics of the microporous membrane, the application range of the microporous membrane is mainly to remove particles, bacteria and other contaminants from the gas phase and the liquid phase to purify, separate, and The purpose of concentration. For microfiltration, the retention characteristics of the membrane are characterized by the pore size of the membrane.
Generally, the pore size ranges from 0.1 to 1 μm, so the microfiltration membrane can separate large diameter cells, suspended solids and the like. It can be used as clarification, security filtration and air sterilization of general liquid.
Widely used in scientific research, medical and health, biochemistry, food, energy, microelectronics industry, nanotechnology, environmental protection and other departments.
Applications:
This product is mainly used for the filtration of mobile phases and samples in chromatographic analysis.
Widely used in gravimetric analysis, microanalysis, colloid separation and sterility testing.
During use, select the appropriate filter based on the sample being filtered.
Liquid clarification, sterilization filtration and particle filtration.
Can be sterilized by high pressure, ethylene oxide and other means.
Features:
Imported membrane, better than domestic nylon 6 performance, good hydrophilicity, high strength, high flow rate, high porosity, suitable for most machine solvents and aqueous solutions, high flux, high quality, high temperature, acid resistant aqueous solution and organic the solvent film has high surface quality and wide drug compatibility.
It has a wide range of dissolution rates and low chemical properties.

Application of C8/C18 SPE Cartridges

SPE cartridges are very versatile, and more and more popular. SPE is mostly used to process liquid samples. The semi-volatile and non-volatile compounds are concentrated, extracted and purified. Solid samples also apply.
Application:
1. Analysis of residues of various antibiotics and antibacterial drugs in various foods;
2. Analysis of pesticide residues in agricultural products;
3. Analysis of legal and illegal additives in various kinds of food;
4. Pharmacokinetic analysis, pharmacokinetic analysis and TCM analysis;
5. PAHs and PCBs analysis in the environment;
6. Analysis of organic matter in drinking water, groundwater and sewage.

SPE cartridges – C18

1. Strong hydrophobic selectivity
2. Suitable for retention of most organic compounds from water and biological samples
3. Enhance the retention of alkaline substances

SPE cartridges – C8

1. The hydrophobic selectivity is slightly lower than C18
2. Suitable for intermediate-polarity compounds
3. Improve the selectivity of basic compounds

Accessories And Consumables Of Pipettes

In the introduction of liquid transfer devices last time, we introduced the basic concept, application scope and storage method of the bottle-top dispenser and liquid transfer Pipettes. Today we briefly introduced the accessories and consumables often involved in these liquid transfer devices. If the auxiliary consumables need to be replaced when the liquid transfer operation is carried out, it can be selected and purchased according to the specific needs.

Holder of Pipettes

The pipette holder is the device used to hang the pipette on it. As shown in the picture 1above, we have two shelves in total: straight pipette holders and round one. Both types of pipette holders can be hung in six pipettes.

Tip of Pipettes

The appearance of the pipette tip is shown as Fig.2 above. The colors of pipette tips with different ranges are different. Some pipette tips have filter elements. The main purpose of the filter element is to prevent sample contamination of the pipette.
The pipette tip is made of pp material, and there are three categories: advanced Pipette Tips, standard pipette tips and advanced Filter Pipette tips.

Features and Package of QuEChERS Extraction Salts

QuEChERS extraction salts contain pre-weighed anhydrous extractable salts, in which anhydrous magnesium sulfate is used to remove water from the sample matrix, and other buffer salts are used to provide a suitable pH to ensure a good recovery rate for some alkali-sensitive pesticides.
When a sample with relatively large water content is encountered, an exothermic reaction occurs between QuEChERS extraction salts and water, thus affecting the recovery rate. When used, the buffer salt can be added after adding the organic solvent to prevent local overheating of the sample.

Features of QuEChERS Extraction Salts

1. Effectively improve the human efficiency of the laboratory and all components are pre-accurate weighing.
2. Ensure the repeatability of the analysis results. Full automatic production, eliminate manual packaging error.
3. Ensure the recovery rate and sensitivity of the multi-residue analysis. QuEChERS extraction salts are specially optimized with no interference of impurities.
4. Convenient transportation and storage, which can greatly reduce the use cost.

Package of QuEChERS Extraction Salts

Pure grade, magnesium sulfate for water removal is packaged after drying in a high-temperature oven to avoid losing its original function due to damp.

Categories and Materials of Bottle-Top Dispenser

Categories of bottle-top dispenser

The division of the bottle-top dispenser is relatively simple, and the standard one is definitely popular in Hawach. Specific sorts are demonstrated in the chart below.
For the materials, there are usually optical glass, Al2O3, ETFE, PFA, FEP, PTFE, alloy of platinum and rhodium and PP.
What is noticeable is that, during the application of the bottle-top dispenser, seven solutions certainly have no access. The numbers and named liquors are listed here.
NO.Solution Type
1The liquid that can react to ETFE, FEP, PEA and Al2O3, like sodium azide.
2The liquid that can corrode optical glass such as hydrofluoric acid(HF).
3The liquid that can have catalytic decomposition reaction with platinum rhodium alloy, like H2O2.
4Nicotinic acid, trifluoroacetic acid and tetrahydrofuran
5Explosive liquid, like carbon disulfide
6Suspension, like carbon-contained solution
7Limited solutions, including concentrated hydrochloric acid, nitric acid, chlorine-generation and fluorine-generation hydrocarbons, which can form precipitates and then cause piston viscosity or clogging.

Categories and Materials of Bottle-Top Dispenser

Technical Indicators of Filter Paper

The technical indicators of filter paper can be divided into two aspects, one of which is the filtration characteristic (permeability, air resistance, maximum pore size and average pore size), and the other is the physical characteristic (includes quantitative, thickness, stiffness, corrugation depth, burst resistance, resin content, etc.).
Specific explanations of comparatively essential characteristics have been demonstrated as the chart below.
CharacteristicExplanation
Quantitative Property(g/m2)The quality of filter paper per square meter.
Thickness(mm)The thickness of filter paper (the depth of corrugation is excluded).
Air resistance (mm)The resistance of filter paper to process air flowing.
Permeability (L/m2.s)The amount of air passing through the filter paper per unit time in the certain area condition and pressure (about 20 mm water column).
Maximum aperture (Micron)The size of the void calculated by the pressure of the first bubble on the filter paper during the test.
Resin content (%)Resin as a percentage of filter paperweight (generally is 10%~30%).
Stiffness (mg)Deformation resistance of filter paper.
Breakage resistance (kPa)The maximum pressure a filter paper can withstand per unit area.

2019年5月28日星期二

Hawach Electronic Pipette-Epipette Introduction

The Hawach electronic pipette is a pipette motor drive digital control pipette with multifunction Pipetting, Mixing, Stepper and Dilution. Lightweight, ergonomic design, small body dimension for easy handling that guarantees fatigue free.
Structure:
epipette
Application: Liquid pipetting, Continuous pipetting
Using Area: Chemical, biological, environmental, pharmaceutical, food and other areas involved in liquid handling.
Users group: Universities, research institutes, testing organizations, third parties related to quality test and related enterprises.
If you are interested in this Electronic Pipette, welcome to have an inquiry: info@hawach.com. We will offer you a favorable price.

Instruction of Bottle-top Dispenser

Generally, there are nine steps to complete the entire operation.
The step orders and corresponding details have been demonstrated as the table below.
Step NumberSpecific Operation
1Insert the intake pipe and screw the nut.
2Insert and tighten the outlet pipe.
3Open the cap and place the cap under the outlet pipe.
4Adjust the liquid volume from “0” to a corresponding value on the rotating scale.
5Exhaust process
Ensure that the outlet pipe cap is opened, and then lift the piston for a distance with continuous pressing.
Repeat the former step once or twice, and stop when bubbles are completely eliminated.
6Prepare the liquid separation after the exhaust process.
If there is still not an entire process, please check whether the pipette or other valves have been installed correctly.
7The operation is exactly the same as the instruction in step four.
8After use press the piston to the bottom first, and then adjust the dial to “0” scale to lock the bottle-top dispenser.
9Transfer process
Stably lift the piston to the highest place, and press the piston to the bottom, which serves as complete separation.
Instruction of Bottle-top Dispenser

Applications and Advantages of QuEChERs

QuEChERs is considered to be a multi-species and multi-residue detection method for agricultural residues analysis in a matrix with high moisture content with the advantages of economy, speed, sensitivity and enough precision, which makes the detection of high water content food more simple and economical.

Solvents of QuEChERs

The preferred solvent is acetonitrile because it extracts the widest range of organic matter without simultaneously extracting large amounts of lipophilic material. Although other solvents may be used depending on the residual required for extraction. However, due to the high compatibility of acetonitrile with GC/MS and LC/MS, the interference can be minimized.

Advantages of QuEChERs

Because the various chemical properties of samples may conflict with the nature of agricultural residues, the analysis of pesticide residues in food and environmental samples is prone to some separation problems. Moreover, a large amount of chlorophyll, lipids and other compounds may exist in the complex sample matrix, which will seriously interfere with the sample analysis. QuEChERs can reduce these problems.
There are three versions of QuEChERs used in the United States.
1. Sodium chloride was used to enhance the extraction effect.
2. Use sodium acetate instead of sodium chloride as a buffer.
3. Double-layer extraction column.

Overview of Buchner Flask

General description
The Buchner flask, also known as the solvent filter, is a kind of glassware used in the laboratory.
Two Existing Sorts of Buchner Flask
There are two kinds of Buchner flasks.
The first is the separate vacuum filter bottle. Its appearance looks extremely like a conical bottle, among which a difference is that a thin neck is designed on the side to connect with the vacuum pump. When a funnel is placed at the mouth of the filter bottle, this time the water pump starts to extract air, lowering the air pressure in the bottle. If there is any solution left on the filter paper in the funnel, because of the atmospheric pressure and gravity, the solution would flow through the paper into the bottle below remaining the solids on the filter paper to achieve the purpose of filtration. During the filtering with a suction bottle, the ceramic funnel, instead of the conical glass funnel, is usually placed on it.
The second is the suction bottle suit. It is required that a filter paper and a vacuum pump are equipped, and the thin neck on the right side needs to be connected with the vacuum pump.

The Detection Method of Pipettes

As a commonly used instrument in laboratory, the accuracy of a pipette is likely to affect the experimental results. If there is a leakage problem, the experimental results will be affected, so how to determine whether there is a leakage situation in the pipette?
The detection method is as follows:
1. Visual detection;
Suck the liquid first and then let it sit vertically for 15 seconds to see if it slowly drains.
2. Pressure pump detection;
Use a special pressure pump to check the pressure and determine whether it leaks.
If air leakage is found in the pipette, then the possible causes of air leakage shall be analyzed:
1. Is the suction head matched?
2. Check whether the suction tip is mounted tightly when assembling.
3. If no problem is found in either of the above two cases, it is likely that the airtightness inside the pipette is not good.
Routine flow of a pipette
1. Suction head mounting – rotary mounting method;
2. Capacity setting: coarse adjustment/fine adjustment;
3. Wash embellish suction head;
4. Suction fluid

The Detection Method of Pipettes

Hawach Liquid Filter Housings

Liquid filter housings, as a kind of indispensable device for conveying medium pipeline, can make the contaminated liquid to achieve a certain degree of cleanliness requiring by production and living.

Features of liquid filter housings:

1. Easy installation and connection, simplified system pipeline;
2. It is very convenient to replace &clean the filter element, and repair the system;
3. Filer element pollution transmitter and oil roadside valve improve the reliability of the hydraulic system.

Application of liquid filter housings:

1. Filtration of a hydraulic system for rolling mills and continuous casting machines in metallurgy industry;
2. Separation and recovery of products and intermediate products in the process of oil refining and chemical production in the petrochemical industry;
3. Purification and uniform filtration of polyester melt in the process of wire drawing for the textile industry;
4. Pretreatment and filtration of reverse osmosis water, deionized water, rinse solution and glucose for electronics and pharmaceutical industry;
5. Purification of oil for lubrication system, speed control system, bypass control system in thermal power and nuclear power industry;
6. Purification of the lubrication system and compressed air for paper-making machines, injecting molding machines, mining machines and large precision machines.

The Principle and Cleaning Method of NH2 HPLC Columns

NH2 HPLC columns refer to the chromatographic columns that use silica gel as matrix carrier to bond amino groups. They are usually used for the analysis of carbohydrate compounds, and the mobile phase is usually methanol, acetonitrile and buffers salt solution.

The cleaning method of NH2 HPLC columns

Foe columns used under positive phase condition, refer to the cleaning method of silica gel columns. For columns used under reverse phase condition, refer to the cleaning method of C18 HPLC columns.

The principle of NH2 HPLC columns

Based on RP principle.
The separation of component molecules on the amino column mainly depends on the hydrogen bond force, and the orientation force and the induction force in the van der Waals force.

Regeneration of NH2 HPLC columns

Under abnormal circumstances, a series of remedial measures are taken to improve the column efficiency and prolong the service life.
NH2 HPLC columns are mainly used to separate optical isomers and substances with the large polar proportion that can’t be separated by reversed phase column, and analyze monosaccharides and hydrocarbon compounds with the features of weak retention, high polarity, unstable, easy hydrolysis under acidic conditions.

2019年5月27日星期一

Application of Gas Filter Housings

gas filter housing is an advanced, efficient and easy to operate automatic filter device. It is widely used in metallurgy, chemical industry, petroleum, papermaking, medicine, food, mining, electric power, urban water supply fields. A gas filter housing is composed of shell, multi-element, backwash mechanism, electric control box, reduction drive, electric valve and differential pressure controller, etc.
A gas filter housing realizes the function of high-pressure backwashing in a real sense, which can easily and completely remove impurities trapped in the filter screen. What’s more, it also guarantees the filtration efficiency and long service life. A gas filter housing also has other design features, such as adopting high strength, high precision and corrosion resistant stainless steel wedge filter screen; coping with unstable water quality fluctuations without manual intervention; less wearing parts, no consumables, low cost of operation and maintenance, simple operation and management.
Application of gas filter housings:
1. Filtration of industrial wastewater and circulating water;
2. Something to do with the regeneration of emulsion;
3. Filtration of waste oil;
4. Descaling system of continuous casting water system, blast furnace water system and high-pressure water for hot rolling in metallurgical industry.

Description of Hawach Filter Capsules

The filter capsules are ready-to-use units for the filtration of media containing particles. They are also used for removing biologicals in pharmaceutical and biotechnology applications. Other applications are like easy sample preparation, separation of cell debris, filtration of serum and cell culture media.
The filter capsules that we have can be found in a variety of specifications sizes and different types. With the standard NPT or saw-genlock interface, you can find its inlet, outlet and exhaust outlets are well equipped to meet your needs. It will ensure connecting pipes of different sizes through the corresponding swivel joints. The installation is always fast and convenient.
Under ISO 9001 standard quality system, we make better filter capsules in 100,000 class cleaning room. The micron rating can reach 0.01um-50.0um. with wide adaptability, they provide in a variety of filter material selection configuration for different volume filtration.
Our filter capsules are the basic purification tool and commodity of many pharma and biotech processes, beverage production, laboratory and general purpose applications, Fitting for purpose, correct quality, and reliable on delivery too.

Introduction of the Glass Fiber

As the Material of Filter Bags – Glass fiber is a traditional and common material for filtering. It is the most economical high-temperature filter material. According to the different composition of the glass, glass fiber can be divided into two types, C (medium alkali) glass fiber filter material and E (alkali-free) glass fiber filter material.
Glass fibers have outstanding high-temperature resistance, which is shown that it can still be work at the temperature of 260℃ with neutral alkali or 280℃ with alkali-free for a long time. And it is found that the highest tolerant temperature might be 350℃.
Besides the above, the glass fiber has excellent tensile strength and corrosion resistance. Its tensile strength is higher than other natural and synthetic fibers. And it can resist the corrosion of most acids except hydrofluoric acid.
The surface of the glass fiber is quite smooth, which means its filtration resistance is low. That is a benefit to peel dust. And the glass fiber does not burn or deform. And when the glass fibers are treated with different surface treatment agents, they will have the advantages of softness, smoothness, hydrophobicity, dew resistance and low shrinkage.

Structure and Use of Syringe Filter

The housing material of syringe filter uses high-quality sanitary polypropylene. The structure and design of syringe filter are precision and ensure smooth filtration. Meanwhile, the rationalization of inner space and extremely low residual rate of syringe filter reduce waste of samples.
In HPLC analysis, as the particle size of packing material in the chromatographic column is small, it can be easily jammed by contamination particles. As a result, the sample and solvent need to be filtered in advance to remove particles of pollutants and thus protect the instrument. The ion chromatography which is commonly used in the analysis of the environment also requires no import of inorganic pollutants in the pre-filtration of samples. As an important procedure in the process of pre-filtration, syringe filter can be used in the analyses of HPLC and IC.
One of the disadvantages of traditional filters is easy to burst. However, after specially designed, some of the syringe filters are able to bear the burst pressure of 7 bar. Usually, the edge of the syringe filter is with a screw thread to realize slip resistance. In the laboratory, the filter membrane with consistent quality and clear specification are used cooperatively. The former one is to ensure the consistency of the analysis result, while the latter one is to relieve trouble of confusion.

The Classification and Parameter of Sample Vials

The vial is a relatively small glass tube or vial, usually with a vial cap. Bottle bottoms are generally flat, rather than having a spherical bottom like a test tube. When choosing a vial, customers should mainly choose from several aspects, such as material, color, volume, diameter, bottle mouth type, and whether to take writing or not.
Material and color
Vials are usually made of glass. They can be colorless or colored, clear or amber.
For example, the common brown reagent vial is mainly used to avoid light. Modern vials can also be made of plastic (like polypropylene). USP1 borosilicate vial is more expensive than domestic glass vials, and transparent glass is all USP1. Transparent color is divided into 7.0 and 5.0, and 5.0 is better.
Volume and diameter
Hawach supply automatic vials with the volume of 2ml,10ml,40ml. Diameter: 8mm, 9mm (8-425/9-425 standard are thread mouth), 11mm is clamp mouth/bayonet;
Bottle mouth type and whether to take writing or not
Hawach sample vials include three types bottle mouth type, screw top, crimp top, snap top(snap top need the corresponding pliers to be used together); There are two types of reagent vials, with and without writing Spaces.

Corresponding Test Reports and Qualification Certificates of Syringe Filter

Multi-function syringe filter is convenient to use for its ingenious structure design. It greatly simplifies the experimental operation steps, improves the work efficiency, and can fully meet the needs of customer sample pretreatment work. All products of syringe filter provided by Hawach have corresponding test reports and qualification certificates. Mainly include the following ones.
●Filter IC test data report of Filstar hydrophilic PTFE
●ICP-MS Test results to a special style of Filstar series with 25mm PES
●Detection results of heavy metal impurities about Winstar Hydrophilic PVDF and Purstar hydrophilic PVDF
●Chemical compatibility of membranes and housing
●Official testing certification of Filter
●Test report of sterilization filter: The test report of the sterilization filter is mainly for the sterilization filter, which is mainly used to explain that the sterilization degree of the sterilization filter is high, and it will not affect the sterilization experiment, that is, it will not introduce other impurity bacteria into the customer experiment
●Chemical compatibility table for filters, membranes: Compatibility refers to whether the solvent used by the customer dissolves the filter/membrane during the filtration process, thus introducing impurities into the customer sample.
Open the following link to see the details of test reports and qualification certificates to the syringe filter: https://www.hawach.com/

Corresponding Test Reports and Qualification Certificates of Syringe Filter