ISO 11127-7:1993

The procedure includes weighing a test portion of 100 g of the sample, adding 100 ml of water, shaking, allowing to settle, filtering if necessary, adding sulfuric acid to 25 ml of the solution, diluting, titrating the solution with silver nitrate, and noting the end point. Annex A gives information on the international standards series for non-metallic blast-cleaning abrasives ISO 11126 and ISO 11127.