The screw bottle is a multipurpose bottle that can be widely used as a conservative container, such as biotechnology, high -purity drugs, reagents, and standard solution for analysis. The glass material uses DURAN ^(R) equivalent to JIS R3503 (1994) "Hakegiic acid-1". There is also a brown screw bottle (DURAN ^(R) ), which is dyed brown for the purpose of shading. Duran ^(r) is a registered trademark of the German Schott (shot) group.