8mm Screw Closure with Red PTFE/White Silicone Septum – 100-pk (P/N: 4300-60A)

These premium 8mm screw closures feature a red PTFE/white silicone septum combination, engineered for reliable sample containment in chromatography and analytical laboratory applications. The PTFE-faced silicone septum provides excellent chemical resistance and low bleed characteristics, making these closures ideal for GC and HPLC autosampler vials where sample integrity and reproducibility are critical.

• Red PTFE layer provides superior chemical inertness and prevents sample-to-septum interaction
• White silicone backing ensures excellent resealing properties for multiple injections
• Black polypropylene cap delivers secure threading and consistent torque
• 8mm diameter compatible with standard screw-thread autosampler vials
• Convenient 100-pack quantity for routine laboratory workflows
• Low-bleed septum formulation minimizes background interference in sensitive analyses