Covers a method, the principle of which is based on the extraction from a test portion of compounds soluble in acetic acid solution and weighing of the residue after heating at 600 °C, removal from the residue, of silica by evaporation with hydrofluoric acid solution and of residual fluorides by heating with ammonia solution, and reweighing of the residue after heating at 600 °C. Is applicable to products having free silica contents equal to or greater than 0,05 % (m/m).

General information

  • Status :  Withdrawn
    Publication date : 1980-07
  • Edition : 1
    Number of pages : 2
  • :
    ISO/TC 47
  • 71.060.50

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