Vial crimp seals, BiMetal (magnetic), 20 mm, with PTFE/silicone septa, pkg 100 Write a review blue seal, PTFE/silicone septa, diam. × thickness 20 mm × 3 mm NACRES: NB.11 Pricing and availability is not currently available. Properties material PTFE/silicone septa blue seal packaging pkg of 100 ea O.D. 20 mm diam. × thickness 20 mm × 3 mm