Red rubber/Polytetrafluoroethylene (PTFE): improved level of cleanliness compared to natural rubber. PTFE coating ensures compatibility.
Natural rubber/Ethylene Tetrafluoroethylene (TEF): features excellent resealing properties.
Silicone/PTFE: cleanest solution for contaminant free sample handling; autoclavable, too.
PTFE/Silicone/PTFE: PTFE laminated to both sides of high-purity silicone to prevent coring.
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