Oct 23, 2018 · All bottles with Orange Color GL45 cap are made of Borosilicate glass, include 100ml, 250ml, 500ml, 1000ml,2000ml,3000ml,5000ml,10L,20L. 1.The cap is made of PP, the max autoclavable temperature is 140℃. 2. GL 45 screw cap is a standard joint. It fits 30/45mm bottle top. The screw OD is 45mm and neck ID is 30mm.