Bottle Caps Selection of Sample Vial

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.

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.

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.

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.

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.

Screw Cap
The screw cap is universal. The sealing effect of the screw cap is excellent, and the spacer is supported by the mechanical model, and no tools are needed during assembly. Additionally, it helps to prevent the spacer from falling off during use.

All HAWACH sample bottles have a clean manufacturing environment of ISO9001. Unique packaging guarantees cleanliness and safety during transport. The bottle mouth can be: thread, snap, jaw (where the jaws need to be matched with pliers). The color have transparent and brown (brown is mainly used to protect from light); The volume includes 2ml, 10ml, 20ml, and 40ml to choose.

Using special production technology, the excellent characteristics of the membrane and silicone rubber are integrated together to make a new type of sealed packaging material for the speta, with good chemical inertness, which can resist acid, alkali, temperature, and anti-adhesion, and does not work with concentrated acid, concentrated alkali or strong oxidant even at high temperature. Its speta has good resilience, sealing, and lubricity in terms of physical properties.