Thermo™ 20mm PTFE/Silicone Septum for Sample Storage Caps, 100-pk

These premium Thermo™ 20mm PTFE/Silicone septa deliver reliable, contamination-free sealing for sample storage vials and headspace applications. The dual-layer construction combines the chemical inertness of PTFE with the excellent resealing properties of silicone, making them ideal for GC, HPLC, and mass spectrometry workflows where sample integrity is critical.

• 20mm diameter with PTFE/Silicone composite construction for broad chemical compatibility
• PTFE layer faces sample to prevent contamination and minimize extractables
• Silicone backing provides superior needle penetration and resealing capability
• Compatible with standard 20mm crimp-top vials and headspace applications
• Suitable for temperatures ranging from -60°C to +200°C
• Convenient 100-pack quantity for high-throughput laboratory environments