Septa, 10/90 PTFE/Silicone for 18-400, 100-pk (B7995-18)

These high-quality 10/90 PTFE/Silicone septa are specifically designed for 18-400 threaded closures, providing reliable sealing performance for chromatography vials and sample storage applications. The dual-layer construction combines the chemical inertness of PTFE with the excellent resealing properties of silicone, making them ideal for GC and HPLC autosampler applications where sample integrity and consistent needle penetration are critical.

• Dual-layer composition: 10% PTFE top layer bonded to 90% silicone base for optimal chemical resistance and resealing capability
• Thread size: 18-400, compatible with standard screw-top vials and caps
• PTFE surface provides excellent inertness and prevents sample contamination
• Silicone layer ensures superior needle penetration and self-sealing performance
• Suitable for GC, HPLC, and general laboratory sample storage applications
• Convenient 100-pack quantity for high-throughput laboratory environments