Different vials for different platforms GC/HS 7 steps to GC/HSsample containment 1 The Vial is usually made of glass or polymer, clear or amber, screw or crimp in style. 2 The Cap can be made of aluminum, steel or polymer. 3 The Septa can be made from PTFE, silicone, rubber, butyl or combination. 3 Recommendations What’s in a HS sample?