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. 20mm closure clear crimp neck hs vials-HPLC Vials Supplier