WHEATON White Polypropylene Screw Cap, Bonded PTFE Silicone Liner, 22-400, Case

White Polypropylene Screw Cap with Bonded PTFE Faced Silicone Liner, 22-400 Size (Case of 500)        
 
White polypropylene screw cap provides clear surface for writing on cap
Polyvinyl liners provide an excellent moisture barrier, can be used with mild acids, alkalis, solvents and alcohols
Foamed polyethylene (PE) liner Foamed polyethylene liner provides chemical resistance for acids, alkalis, solvents, alcohols, oils, household cosmetics and aqueous products. Excellent for environmental samples, pharmaceuticals and diagnostic reagents.
PTFE faced foamed PE liner offers excellent chemical resistance, ideal for use with high purity chemicals, strong acids and solvents
PTFE faced silicone liner consist of 0.055" (1.4 mm) of silicone and 0.005" (0.14 mm) of PTFE . Ideal for storage and retrieval of volatile solvents, sensitive compounds and corrosive chemicals.