Today DWK Life Sciences offers a wide range of reusable glass bottles with commonly used thread finishes such as Glass Packaging Institute (GPI) and German DIN GL thread standards. The DURAN® ORIGINAL, WHEATON®, and KIMBLE® KIMAX® GL lab bottles are molded from high-purity, clear, USP / EP Type I borosilicate 3.3 glass, renowned for its excellent thermal qualities and superior resistance