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18mm Screw Metal Caps

Aijiren’s 18mm screw cap uses PTFE/silicone septa and proposes a precision threaded metal cap with an 8mm center hole. Usually used with 18mm screw headspace vials.

Rated 4.9/5 based on 406 customer reviews
Aijiren’s Septa has different thicknesses for different materials. For example, the thickness of PTFE/Silicone double-layer Septa is 1.5mm and 1.3mm, and the thickness of PTFE/Butyl double-layer Septa is 1.6mm. It is certain that septa with different thicknesses has a good sealing effect when tightening the cap.
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