Reference number
ISO 6229:1980
ISO 6229:1980
© ISO 2024
ISO 6229:1980
Sodium hexafluorosilicate for industrial use — Determination of free silica content — Gravimetric method
Edition 1
1980-07
1980-07
Withdrawn
Abstract
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).