The Headspace Vials produced by Aijiren have two different calibers, one is Crimp Neck and the other is Screw Neck. Aijiren uses borosilicate hydrochloric acid glass to make Headspace Vials, because the borosilicate hydrochloric acid glass can ensure the stability of the reagent when it is inside the Vias. And it can also ensure the safety of Vials itself. The borosilicate glass used by Aijiren is resistant to high temperature, not easy to break, not easy to burst, and easy to use.