Caps are manufactured from the highest purity, ultra-low bleed silicone available in the market.

• 9 mm natural polypropylene caps or 11 mm silver aluminum crimp caps
• Available in non-slit and pre-slit formats
• Ultra-low bleed blue/teal silicone Shore A is laminated to white PTFE film, 3 mm thick
• Silver aluminum crimp caps are lacquer coated

Certified ULTRAPure septa is manufactured from the highest purity, ultra-low bleed silicone available in order to combat the leachable effects of silicone without trading off the ability to be pierced multiple times. The MicroLiter certified pure septa provides accurate and reproducible LC-MS and GC-MS results.