The Craig stopper is placed in the tube neck and the whole apparatus is inverted into a test or centrifuge tube. Centrifuging forms a mat of crystals between the stopper and the walls of the Craig tube, and draws away excess solvent. Sold in sets; tubes and stoppers also sold separately.
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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