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What is the difference between Class A and Class B Glassware?

April 26, 2017class glassware

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What is the difference between Class A and Class B Glassware?

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Volumetric glassware that is permanently marked Class “A” is guaranteed to comply with volumetric tolerances prescribed in ASTM E694, and latest revisions. It is also supplied with a serialized certificate of precision. Volumetric glassware that is permanently marked Class “B” has a tolerance that is twice as large as Class “A”.