NATURAL rubber cork is a small, tapered plug made of high-quality NATURAL rubber that is used to seal laboratory glassware, such as test tubes, flasks, and bottles. It is designed to fit snugly into the opening of the glassware, creating a tight seal that prevents the entry or escape of gases or liquidsStoppers and corks are used in laboratories to securely seal vessels. Laboratory stoppers are used not only to prevent spills, but also to trap noxious fumes or to allow the vessel to be shaken.
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