ISO 6229:1980 PDF
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Sodium hexafluorosilicate for industrial use — Determination of free silica content — Gravimetric method
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).
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| Edition | 1980 |
|---|---|
| Published Date | 1980 |
| Published By | International Standardization Organisation |
| Page Count | 2 |
