ISO 1619:1976

Cryolite, natural and artificial — Preparation and storage of test samples

Publication date:   Sep 1, 1976

General information

90.93 Standard confirmed   Oct 24, 2022


ISO/TC 226 Materials for the production of primary aluminium

International Standard

71.060.50   Salts



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Specifies the procedure for the preparation of crude samples and dried samples and of natural and synthetic materials having a molar ratio sodium fluoride/aluminium trifluoride between 3 and 1,7 approximately. The crude sample is intended for the determination of geometric characteristics, for certain physical and physico-chemical tests and for moisture determination. The dried sample serves especially for chemical tests. The principle of the procedure consists in grinding followed by sieving of the sample until the whole passes through a sieve of mesh aperture 0,125 mm. Thorough mixing and drying at approximately 110 °C.

Life cycle


ISO 1619:1976
90.93 Standard confirmed
Oct 24, 2022