8mm Black Cap with Red PTFE/White Silicone Septa, Pre-Slit (100-pk) | SKU: 4008-77A

These premium 8mm black screw caps feature a high-quality red PTFE/white silicone septum designed for reliable sample containment and efficient autosampler needle penetration. The pre-slit configuration eliminates the need for manual piercing, reducing coring and ensuring consistent injection performance in GC and HPLC applications. Ideal for laboratories requiring dependable sealing solutions for volatile and semi-volatile compound analysis.

• Septum Material: Red PTFE/White Silicone composite for excellent chemical resistance and resealing properties
• Pre-Slit Design: Factory-cut septum enables smooth needle entry and minimizes sample contamination
• Cap Size: 8mm diameter compatible with standard 8-425 threaded vials
• Cap Color: Black for easy sample identification and light-sensitive sample protection
• Quantity: 100 caps per package for cost-effective laboratory supply
• Applications: Suitable for GC, HPLC, and general autosampler use with volatile organic compounds