Home » News » 20ml crimp headpace vials » Perkin Elmer 18mm crimp headspace vials with round bottom for GC/MS Vials, Closures And Inserts - Chroma Chemie HPLC / GC Compatible – Aijiren technologies, Shimadzu, Perkin Elmer, Thermo etc. Vials Quality – USP type 1 class A, 33 Expansion or 51 Expansion.