20MM CRIMP TOP HEADSPACE VIALS- Chemglass Life Sciences. These vials are manufactured from Type 1 Class A Borosilicate glass. The standard flat bottom vials can be used with Hewlett-Packard, Carlo Erba and Clear Glass 20ml Headspace Vials, 23 x 75mm, Bevel Top, Round . Clear Glass 20ml Headspace Vials, 23 x 75mm, Bevel Top, Round Bottom.