This standard BS 5050:1974 Methods of test for cryolite is classified in these ICS categories:
- 73.060.40 Aluminium ores
- 71.100.10 Materials for aluminium production
- 71.060.50 Salts
Preparation and storage of test samples, determination of silica, fluorine, iron and sodium contents and of aluminium content by gravimetric and atomic absorption methods.
https://www.en-standard.eu/bs-5050-1974-methods-of-test-for-cryolite/
