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ISO 5437:1992

Acid-grade and ceramic-grade fluorspar — Determination of barium sulfate content — Gravimetric method ISO 5437:1992

Publication date:   Dec 3, 1992

95.99   Withdrawal of Standard   Mar 3, 2010

General information

95.99   Withdrawal of Standard   Mar 3, 2010

ISO

ISO/TC 175 Fluorspar

International Standard

73.080   Non-metalliferous minerals

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Scope

The method is based on evaporation to dryness of a test portion in the presence of hydrofluoric acid and concentrated sulfuric acid, extraction of the soluble salts from the mixture, filtration, drying and weighing of the residual barium sulfate. Applies to products having barium sulfate contents equal to or greater than 0,1 % (m/m).

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 5437:1988

NOW

WITHDRAWN
ISO 5437:1992
95.99 Withdrawal of Standard
Mar 3, 2010




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