20mm Crimp Cap with Clear PTFE/Gray Butyl Rubber Septa, 100-pk

These 20mm crimp caps feature a high-quality clear PTFE/gray butyl rubber septum combination, engineered for reliable sealing in chromatography, sample storage, and headspace analysis applications. The chemically inert PTFE facing provides excellent resistance to aggressive solvents and prevents sample contamination, while the butyl rubber backing ensures superior resealing properties for multiple injections. Ideal for GC, HPLC, and general laboratory vial closure requirements.

• Cap Size: 20mm diameter crimp-style closure
• Septum Material: Clear PTFE (polytetrafluoroethylene) lined with gray butyl rubber
• Chemical Compatibility: PTFE layer offers exceptional resistance to acids, bases, and organic solvents
• Resealing Performance: Butyl rubber backing provides reliable resealing for multiple needle punctures
• Package Quantity: 100 caps per pack
• SKU: 4570-136