Thermo Scientific™ 9mm Autosampler Vial Septa. 9mm Septa are available in PTFE/ Red Rubber, PTFE/Silicone or Red PTFE/White Silicone/Red PTFE to suit a variety of applications. Pricing and Availability. Thermo Scientific™ SUN-SRi™ 20mm Septa. Sun-SRI provides high quality vials, caps, seals, septa, and closures to meet or exceed original