Product Description. SDS. Z114111. tan PTFE/silicone septa, size × total thickness × PTFE thickness 20 mm × 0.130 in. × 0.005 in., for use with tear-off seals. Pricing. Match Criteria: Product Name, Keyword. Vial crimp seals, BiMetal (magnetic), 20 mm, with PTFE/silicone septa, pkg 100.