ASI GC Headspace Cap 20mm, Aluminum Crimp Seal with PTFE White Silicone Septa for Headspace Vial, 100 Pk What are the different types of vapor barriers? VAPOUR BARRIER BARRIER ALU NET ADHESIVE 300 BARRIER ALU NET ADHESIVE 300 ROTHOBLAAS VapAir Seal MD VAP ALU ADH ASI GC Headspace Cap 20mm, Aluminum Crimp Seal with PTFE White Silicone Septa for Headspace Vial, 100 Pk
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