Stoppers can be used with laboratory glassware such as flasks, mixing cylinders and separatory funnels. All stoppers are solid except Standard Taper stopper sizes 32 and 38, which are hollow. Made in accordance with ASTM Standard E694 and 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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800-334-7725
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