38564

ISO 1690:1976

Sodium and potassium silicates for industrial use -- Determination of silica content -- Gravimetric method by insolubilization

standard by International Organization for Standardization , 02/01/1976

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Full Description

The procedure is based on evaporation to dryness of a test portion previously acidified with hydrochloric acid. Dissolution of the soluble salts, filtration and washing of the insoluble matter. Second evaporation of the filtrate and washings under the same conditions, further dissolution of the soluble salts, filtration and washing. Calcination and weighing of the two lots of insoluble matter simultaneously. Volatilization of silica by heating with hydrofluoric and sulphuric acids and weighing of the residue after calcination. The*difference in mass represents the silica present in the test portion.

 

Product Details

Published:
02/01/1976
Number of Pages:
3
File Size:
1 file , 270 KB
Same As:
BS 6092-3:1981
Note:
This product is unavailable in Ukraine, Russia, Belarus