Numéro de référence
ISO 6229:1980
ISO 6229:1980
© ISO 2024
ISO 6229:1980
Hexafluorosilicate de sodium à usage industriel — Dosage de la silice libre — Méthode gravimétrique
Edition 1
1980-07
1980-07
Annulée
Résumé
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).