Septa, PTFE/Silicone blue PTFE/white silicone, diam. × thickness 20 mm × 0.75 mm, pkg of 100 ea; Synonyms: PK100 20MM PTFE/SILICONE SEPTA, .030IN THICK; find Supelco-27539 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich