White PTFE Silicon SEPTA 20mm is a type of crimp cap which is applied over glass vial. It is made of superior quality aluminum alloy and comprises white PTFE septa. This cap gives flexibility of removing sample by inserting needle through its top surface. It has superior re-sealing characteristics with light weight nature. This septa can easily be applied with help of crimp hand tool in tight & secure manner. It can easily withstand extreme temperature conditions without any structural wear. White PTFE Silicon SEPTA 20mm has smooth surface and is available at reasonable rates in large quantities.