1Key Takeaways
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, filtratio…
2Scope / 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.
5Citation Network
Standards that cite ISO 1690:1976
6Frequently Asked Questions
What is ISO 1690:1976?
ISO 1690:1976 — Sodium and potassium silicates for industrial use; Determination of silica content; Gravimetric method by insolubilization is an international standard developed by International Organization for Standardization (ISO). 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...
What does ISO 1690:1976 cover?
This standard covers: 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...
Who should use this standard?
This standard is intended for organizations, professionals, and stakeholders involved in various industries and sectors. It is applicable to manufacturers, service providers, regulatory bodies, and certification organizations.
What is the latest version of ISO 1690:1976?
The current published version is ISO 1690:1976, published on 1976-02. Always check for amendments or pending revisions.
How do I purchase ISO 1690:1976?
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