20ml Clear Glass Screw Neck Sample Storage Vial. Aijiren uses type 1, type A, 33 expanded borosilicate glass or 51A amber glass for storage glassware, with a capacity from 20mL to 60mL, providing a constant pH value to maintain the life of the sample. Rated 4.5 /5 based on 328 customer reviews. 20ml glass vial 20ml sample storage vial 20ml