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ISO 4280:1977

Current
Current

The latest, up-to-date edition.

Cryolite, natural and artificial, and aluminium fluoride for industrial use Determination of sulphate content Barium sulphate gravimetric method
Available format(s)

Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

English, French

Published date

01-11-1977

Applicable to products having a content, expressed as sulphur trioxide, equal to or more than 0.1 % (m/m). Bases on alkaline fusion of a test portion with a mixture of sodium carbonate and boric acid. Extraction of the fused mass with perchloric acid solution and precipitation of the sulphate ions with barium chloride in an acidified medium. Filtration on a fine-texture, ashless filter paper (pore diameter approximately 0.4 to 1.0 m). Calcination after drying in an electric oven at (850 20) C. Weighing of the residue.

DevelopmentNote
Also numbered as BS 4993-8(1980) and BS 5050-11(1980). (07/2005)
DocumentType
Standard
Pages
3
PublisherName
International Organization for Standardization
Status
Current

Standards Relationship
NFT 20 161 : 84 FD Identical
NBN T 03 447 : 1983 Identical

ISO/TR 4277:2009 Cryolite, natural and artificial Conventional test for evaluation of free fluorides content
PD ISO/TR 4277:2009 Cryolite, natural and artificial. Conventional test for evaluation of free fluorides content

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