20mm Crimp Top Headspace Vial with Aluminum Cap–Aijiren HPLC Vials 20mm Headspace Crimp Vials are often used in Shimadzu, Spectral Physics, Varian, and other autosamplers. 20mm crimp top septa is used PTFE and high-quality silicone rubber or ultra-pure silica as raw materials, the gasket is guaranteed to be non-toxic. 1 20ml clear headspace vials price for analysis instrument VWR 18mm Clear