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

These premium 18mm steel magnetic screw caps are engineered for reliable sealing in automated and manual chromatography applications. Featuring a white PTFE-faced translucent silicone septum, these caps provide excellent chemical resistance and superior resealing properties, making them ideal for GC and headspace analysis where sample integrity and consistent needle penetration are critical.

• Septum Material: White PTFE/Translucent Silicone – offers excellent inertness and low bleed characteristics
• Magnetic Steel Construction: Compatible with automated sampling systems and magnetic cap handling
• Cap Size: 18mm diameter for universal fit with standard headspace vials
• Chemical Resistance: PTFE layer provides superior resistance to acids, bases, and organic solvents
• Resealing Performance: Silicone backing ensures reliable multiple-injection capability
• Package Quantity: 100 caps per pack (SKU: 4570-305)