18mm Steel Magnetic Screw Cap with Blue PTFE/White Silicone Septum, 100-pk

These premium 18mm magnetic screw caps are engineered for reliable sealing in headspace analysis, GC, and GC-MS applications. The steel cap construction with magnetic properties ensures compatibility with automated sampling systems, while the blue PTFE/white silicone septum provides excellent chemical resistance and consistent needle penetration for reproducible analytical results.

• Cap Size: 18mm diameter with magnetic steel construction for autosampler compatibility
• Septum Material: Blue PTFE face bonded to white silicone backing for optimal chemical inertness and resealing properties
• Application: Ideal for headspace vials, GC analysis, and volatile compound testing
• Chemical Resistance: PTFE layer provides superior resistance to acids, bases, and organic solvents
• Quantity: 100 caps per package for cost-effective laboratory supply
• SKU: 4570-318