2ml Amber HPLC Screw Vials with Blue Caps for Sale The 2ml HPLC Screw Vials are made from clear/ amber, Type I borosilicate and 33 expansion glass.2ml Amber HPLC Screw Vials with unique thread design ensures consistent seal and can be reused, not volatile, easy to use, Reduce the chances of bent or broken needles during sampling.