The coefficient of linear expansion refers to the change in the length of the glass each time the temperature changes. The classification of laboratory glass is established by the USP (United States Pharmacopeia) based on its water resistance.
USP TYPE 1, A-grade, 33 borosilicate hydrochloric glass
Chemically inert glass is widely used in laboratories, especially for chromatographic applications. Class I glass is mainly composed of silicon and oxygen, contains trace amounts of boron and sodium, has low dissolution, and the linear expansion coefficient is 33.
Chemically inert glass is widely used in laboratories, especially for chromatographic applications. Class I glass is mainly composed of silicon and oxygen, contains trace amounts of boron and sodium, has low dissolution, and the linear expansion coefficient is 33.
USP TYPE 1, B-grade, 51 borosilicate hydrochloric glass
It is mainly composed of silicon and oxygen. It contains traces of boron, sodium, and alkali metals more than A-grade glass, but still meets laboratory use. All brown glass is B-grade glass, with a linear expansion coefficient of 51.
It is mainly composed of silicon and oxygen. It contains traces of boron, sodium, and alkali metals more than A-grade glass, but still meets laboratory use. All brown glass is B-grade glass, with a linear expansion coefficient of 51.
Silanized or deactivated glass
The borosilicate hydrochloride glass, which has been deactivated by organosilylation, has strong hydrophobicity and inertness on the glass surface, which is suitable for pH-sensitive compounds, trace analysis and long-term sample storage.
The borosilicate hydrochloride glass, which has been deactivated by organosilylation, has strong hydrophobicity and inertness on the glass surface, which is suitable for pH-sensitive compounds, trace analysis and long-term sample storage.
There are three types of sample vial caps: the jaw cover, the clamping cap, and the screw cap. Each sealing method has its own advantages.
Jaw Cap
The clamp cover presses the gasket between the bottle edge of the glass sample bottle and the folded aluminum cover. The sealing effect is very good, which can effectively prevent the evaporation of the sample. For a small number of samples, manual capping is the best choice.
The clamp cover presses the gasket between the bottle edge of the glass sample bottle and the folded aluminum cover. The sealing effect is very good, which can effectively prevent the evaporation of the sample. For a small number of samples, manual capping is the best choice.
Bayonet Cap
The clamping cover is an extension of the sealing mode of the jaw cover. The tension of the plastic cover is caused by its attempt to restore its original size. This tension forms a seal between the glass, the bottle cap, and the gasket. The plastic clamping cover can be covered without any tools.
The clamping cover is an extension of the sealing mode of the jaw cover. The tension of the plastic cover is caused by its attempt to restore its original size. This tension forms a seal between the glass, the bottle cap, and the gasket. The plastic clamping cover can be covered without any tools.
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