Home

Subscribe to updates

ISO 1690:1976

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

This standard has been reviewed and then confirmed in 2011 
More information

ISO standards are reviewed every five years

Close

Media and price

Format Price Language
PDF CHF 38,00 Add to basket
Paper CHF 38,00 Add to basket

 

Abstract

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.

 

  • Edition: 1 (Monolingual) ICS: 71.060.50
    Status: Published Stage: 90.93 (2011-10-13)
    TC/SC: ISO/TC 47 Number of Pages: 3
  • No revision information available

  • No corrigenda or amendments available

Preview and follow ISO 1690:1976 on our Online Browsing Platform

Preview


Contact customer services

Send your enquiry by email
or call us on +41 22 749 08 88
09:00 – 12:30, 14:00 – 17:00 (UTC+1).

Related standards

Standards in the same category (71.060.50)
Standards from the same committee