Aijiren's Glass Vial with Crimp Caps uses borosilicate hydrochloric acid glass as raw material. Clear glass is made of USP Type 1, Class A, 33 Borosilicate Glass, and Amber glass is made of USP Type 1, Class B, 51 Borosilicate Glass. Aijiren uses high-quality raw materials to ensure the quality of hplc vial.