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ISO 4281:1977

Current Revision

Sodium hexafluorosilicate for industrial use -- Determination of free acidity and total hexafluorosilicate content -- Titrimetric method

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With respect to the free acidity, applicable to products having contents, expressed as H2 SiF6 , equal to or more than 0,1 % (m/m). First, determination of the free acid contents by titration of an ice-cooled test portion with a standard volumetric sodium hydroxide solution in the presence of potassium nitrate and using bromothymol blue as indicator, then, followed by titration at near boiling temperature with standard volumetric sodium hydroxide solution to the appearance of a permanent blue colour.


SDO ISO: International Organization for Standardization
Document Number ISO 4281
Publication Date Not Available
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO TC 47
Publish Date Document Id Type View
Not Available ISO 4281:1977 Revision