The linear expansion coefficient means that the temperature of the glass changes every degree of temperature change. The lower the linear expansion coefficient, the greater the temperature change that the glass can withstand. The classification of laboratory glass is based on the USP (United States Pharmacopoeia) based on its water resistance.
USP TYPE 1, Class A, 33 borosilicate glass]
The most chemically inert glass, 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, and has the lowest dissolution rate and linear expansion coefficient of 33.
[USP TYPE 1, Class B, 51 borosilicate glass]
It is mainly composed of silicon and oxygen. It contains trace amounts of boron, sodium and alkali metals with a higher content than grade A glass, but it can still meet laboratory applications. All brown glass is grade B glass with a linear expansion coefficient of 51.
[Silylated or deactivated glass]
The deactivated borosilicate glass treated with organosilanated glass has a highly hydrophobic and inert glass surface suitable for pH sensitive compounds, trace analysis and long-term sample storage.
[Threaded sample vial]
Provides a bottom evaporation that can be reused and has a smaller seal than the jaw cover, and requires no additional tools. The screw cap vials are distinguished by different thread sizes, which are specified by the Glass Packaging Association (GPI). Definition, the composition of the threaded vial, for example: 9-425 vial bottle mouth thread outer diameter of about 9mm, thread type is 425, threaded mouth sample bottle and cover pad price is higher than the jaw bottle.
[Threaded mouth sample bottle cover pad]
There is a hole cover with automatic injection design, a solid cover for sample storage, and an integral PP cover. This puncture screw cap is designed for single injection and does not require a cover pad assembly, saving experimentation. Preparation time.
[Jaw sample vial]
Sealing with an aluminum cover is relatively inexpensive, and when properly clamped, it can be used for long-term storage to provide an optimal seal. The jaw cover is not reusable and requires a relatively large force to clamp.
A capper is required for sealing and the capper is removed to remove the sealing cap. Sealers and decappers for different sizes of aluminum caps, including adjustable precision cappers, adjustable hand cappers provide an adjustable stop point on the handle for each pressure The tightness of the cover is the same. Adjusting the screw inside the metal jaws can change the depth of the jaws. The correct jaw depth is important because the jaws are too tight, which can cause the septum to deform toward the center, damaging the needle and the Teflon and the jaws in the correct position. Large holes, too loose jaws will cause the septum to sag or the sample to evaporate. The manual capper can remove the aluminum cover safely and quickly with only one grip. The design of the decapper is similar to that of the pliers, providing an economy. The choice is that the decapper is required when the sample contains harmful substances, because the use of the decapper is not easy to cause leakage.
Because the bottle mouth is thick, it will not be damaged when the cover is opened. It can be used together with the bayonet cover or the bayonet cover. It is not necessary to use the tool when using the bayonet cover. Because it is not as tight as the jaw bottle screw bottle, it is recommended for Short-term sample storage or non-volatile samples.
For Water's HPLC autosampler or other autosampler that does not require a robot to grab a vial, it is a more economical alternative to threaded vials, most with a star-shaped incision and easy to puncture PE (polyethylene) caps are sold together.