9mm Blue Screw Cap with Red PTFE/White Silicone Septa, 100-pk | SKU: 4400-32B These premium 9mm blue screw caps with red PTFE/white silicone septa are engineered for reliable sample protection in HPLC, GC, and general autosampler applications. The dual-layer septa construction combines the chemical inertness of PTFE with the excellent resealing properties of silicone, ensuring consistent performance across multiple injections while preventing sample contamination and evaporation. Septa Material: Red PTFE/White Silicone dual-layer construction for superior chemical resistance and resealing capability Cap Size: 9mm diameter screw thread, compatible with standard 2mL screw-thread autosampler vials Color-Coded Design: Blue cap for easy sample identification and laboratory organization Chemical Compatibility: PTFE layer provides excellent resistance to acids, bases, and organic solvents Quantity: 100 caps per package for cost-effective laboratory supply management Applications: Ideal for HPLC, GC, LC-MS, and general chromatography sample storage and analysis