This E-C sample vials with solid phenolic cap conform to USP Type I and ASTM E 438 Type I, Class A requirements. Vials packed in two shrink-wrapped packs which reduces contamination from corrugate. 14B Rubber lined black Phenolic screw cap for aqueous samples. The clear vials are manufactured from Wheaton-33® low extractable borosilicate glass. Vials and caps are autoclavable. 24mL Capacity