ISO-4277 › Historical Revision Information
Cryolite, natural and artificial -- Conventional test for evaluation of free fluorides content
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ISO/TR 4277:2009 describes a conventional test for the evaluation of the free fluorides content of natural, artificial and recovered cryolite.
This method is applicable to products having free fluorides content greater than 0,15 % (mass fraction) of AIF3 or 0,4 % (mass fraction) of NaF.
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Document Number
ISO 4277:1977
Revision Level
1977 EDITION
Status
Superseded
Publication Date
Nov. 1, 1977
Committee Number
ISO/TC 226