Let me introduce the material of 8-425 2ml autosampler vials, 33 Expansion borosilicate glass USP Type I Class A made of clear vial, or 51 Expansion borosilicate glass USP Type I, Class B made of Amber vial.Our glass uses neutral borosilicate and low borosilicate, but our neutral borosilicate can reach the standard of high borosilicate, and our low borosilicate can reach the standard of neutral borosilicate. We use excellent raw materials to make 8-425 2ml autosampler vials.