These heavy duty 500 mL square bottles are manufactured from PYREX® borosilicate glass for A wide range of optional caps are available for these bottles. Gl45 Blue Plastic Screw Cap Lab Glassware 500ml Reagent Bottle . Reagent bottles are available with narrow mouths for better control while pouring, or wide mouths for easy filling or content retrieval. Aijiren produce all the GL45 500ML Wide Mouth Reagent Bottle - Aijiren Autosampler vials. The caps and stoppers of the reagent bottles