screw neck cap

Caps for screw thread vials are available with either an open hole for autosampler use and standard addition or with a solid top for sample storage. One piece polypropylene cap and membrane are also available. These pierceable screw thread caps are designed for one time use and reduce sample preparation time as there is no cap and seal to assemble.

The metal cover provides the widest temperature tolerance range and is very resistant to impact cracking. The metal cover is very suitable for gas chromatography applications. The metal cover is made of steel (chrome-plated or tinplate anti-corrosion coating) or aluminum.

Caps with solid PE liners offer good chemical resistance and low moisture vapor transmission rate and is great for nail polish remover and higher concentration acids & alkalis. Good for non-oil products filled at room temperature. Because this lining system is paperless, your samples will not be contaminated with fiber or paper particles from the closure. Available in Phenolic caps.

Aijiren’s screw PP cover for sample storage vial is made of high-quality polypropylene. The color is usually black and white. You can choose whether to have a cap with a center hole. A cap with a center hole will make it easier for the syringe to be in the vial. Inject the sample or withdraw the sample.

The screw caps produced by Aijiren can have an opening for the autosampler and standard additions, or they can have a solid top for storing samples. A polypropylene cap and film are also available. These pierceable screw caps are designed for one-time use, and because there are no caps and seals to assemble, the sample preparation time is reduced.