Do You Really Know the Differences Between the Glass Sample Vials?

The sample vials supplied by Hawach are precisely designed, engineered, and manufactured to exacting specifications. Hawach also rigorously tests dimensions such as polishing, OD, and length – to ensure that each vial is exactly matched to the autosampler jaw and sample system. The design and manufacture of caps and septa ensure a good seal and are compatible with other brands and other instruments.

Chromatographic performance tests on silicone rubber septa are performed to ensure the high purity requirements, impurity contamination elimination, and possible analytical errors. The 2-40ml chromatographic injection bottles, headspace sample bottles, and storage bottles are commonly used. Suitable for most autosamplers

Glass sample vials
Glass sample vials are the most common small consumables in the lab. But have you noticed what materials are made of glass, what the differences between these materials are and how to distinguish between good and bad. Glass sample vials are generally made of borosilicate glass, with the commonly seen expansion coefficients of 3.3, 5.0 and 6.8. However, when the manufacturer sells the sample vial, there is almost no intended description of the material, so few people will care about what material it is.

Expansion coefficients
3.3: Mainly used in experimental instruments and household heat-resistant utensils; low expansion ratio, high-temperature resistance, high strength, high light transmittance, and high chemical stability; water resistance level 1.
5.0: Neutral glass, low expansion rate, high-temperature resistance, high strength, high chemical stability; water resistance level 1.
6.8: Low borosilicate glass, the chemical performance is worse than 3.3, but the cost is much lower than 3.3, it is suitable for one-time use.

Screw Thread Top Sample Vials With Caps
Amber Crimp Top HPLC Sample Vials
Clear Screw Thread Top Sample Vials & Caps for HPLC

How to distinguish it easily?
The most obvious is the light transmittance. Put a whole box of sample vials in the sun, the glass of 3.3 will be clear and transparent, and the 6.8 will have obvious cyan. If it is a brown bottle, the color is more clear, 5.0 will be a very uniform amber, 7.0 will appear brown instead of amber. Through the above, we can see that each material has its own characteristics, and there is no complete good or bad. It can only be said the sample vials are to be selected according to the specific requirements of the laboratory.

1. High quality borosilicate glass tube with low free ion content, low expansion coefficient and very high chemical resistance.
2. Unique thread design ensures consistent seal
3. Strict quality assurance provides dimensional consistency between batch and batch
4. Pass LCMS cleanliness test
5. A variety of matching micro-introduces for selection
6. Suitable for automatic sampler of other companies

Hawach samples vials
Hawach is specialized in different kinds of lab consumables, with high quality and reasonable price which has been well received all over the world. The sample vials and pads produced by Hawach has passed ISO9001: 2000 certification. All products are produced and packaged in Class 10,000 cleanroom. Almost all of the glass products are made of first-grade hydrolyzed glass.

The glass is very hard and has good chemical compatibility for acidic, neutral or alkaline solutions. It features uniform size and high precision, photoelectrically controls the production process of each vial and pad assembly during production. There is a wide range of specifications, to meet the injection needs of the major chromatographic brands.