DURAN® Original GL laboratory bottles have become the gold standard of multifunctional laboratory bottles since their introduction in 1972. The bottles are moulded from high-purity, clear, USP/EP Type I borosilicate glass 3.3, renowned for its excellent t. DURAN® Original GL 45 Laboratory Bottle, clear, with screw cap and pouring ring, PP, blue, 500 mL | DWK Life Sciences.