DURAN® Narrow Mouth Lab Glass Bottles have a standardized GL-thread and matching cap systems for particularly tight sealing. Made from Type 1 (borosilicate) Glass conforming to USP/EP and are very steady due to large base. Outstanding chemical resistance and near inert behavior with no interfering ion exchange. High temperature and thermal shock resistance make this bottle ideal for autoclaving and dry sterilizing. Sturdy design and uniform wall thickness distribution for improved safety and longer service life. Suggested for pharmaceutical and food applications with a large labeling field and easy-to-read permanent graduations.Manufacturer's Lead Time May Apply.