Wheaton® NextGen™ V Vial screw thread glass vials have a conical interior bottom for maximum retrieval of content. These high recovery vials are designed for small-scale reactions, centrifugation, storage, and shipping. Vials feature a fire-glazed bottom which protects against glass particulates. Low-particulate packaging provides excellent contamination protection for transport and storage. Manufactured from Wheaton 33® low extractable borosilicate glass which protects samples from changes in pH caused by ordinary alkali-containing, ordinary soda lime glass. Conforms to ASTM Type I, Class A, and USP Type I requirements. Vials are non-graduated and feature an attached solid top phenolic screw cap with a PTFE-faced silicone liner.