Reference number
ISO 8215:1985
ISO 8215:1985
© ISO 2025
International Standard
ISO 8215:1985
Surface active agents — Washing powders — Determination of total silica content — Gravimetric method
Edition 1
1985-12
1985-12
ISO 8215:1985
15311
Published
(Edition 1, 1985)
This publication was last reviewed and confirmed in 2019.
Therefore this version remains current.
Abstract
From a test portion all ethanol-soluble matter is removed by extraction with ethanol. The solution of the ethanol-insoluble residue is treated with hydrochloric acid and evaporated to dryness. The residue is dissolved in water and the operations are repeated twice. From the solution obtained after this operations the precipitate is filtered, washed, heated to 900 °C and weighed.