black pp caps

Ensure the integrity of your high-performance liquid chromatography (HPLC) samples with our premium-quality polypropylene (PP) caps, designed and manufactured in China.

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.