Glass short-stem fluted funnels for filter paper have a beaded rim and heavy wall for strength. The filter angle and depressed inside fluting help reduce filtering time. The funnels come in four sizes.
Funnels have a beaded rim and heavy wall for strength. Formed to a 60ยบ angle, which permits accurate fitting of the filter paper, thus reducing filtering time. Depressed inside fluting further decreases filtering time.
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How to Filter and Decant- Chemistry