Kimble 41900R KIMAX Medium Length Standard Taper Pennyhead Glass Stoppers are used with laboratory glassware such as flasks, mixing cylinders and separatory funnels. Standard Taper size 13 stopper is solid, stopper size 38 is hollow. Designed from ASTM Specification E675. Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements.
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