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Burette, Class B, PTFE Stopcock, to ASTM E-287 1122-28-7 Al2O3-sapphire 532-91-2
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Burette, Class B, PTFE Stopcock, to ASTM E 287 1122 28 7 Al2O3 sapphire 532 91 2 Al2O3 sapphire not pressure resistant Suitable for use in schools and institutional laboratories not requiring the accuracy of Class A Borosilicate 3
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