Home » News » 20ml crimp headpace vials » Wholesales 18mm crimp headspace vials for GC Waters Headspace Vials and Caps | Aijiren Aijiren 10 mL and 20 mL certified screw and crimp style, clear or amber glass headspace vials and associated 11 mm, 18 mm, and 20 mm headspace caps are engineered to prevent sample contamination while providing consistent, secure seals.