This standard applies to non-metallurgical alumina of special grades, recrystallized under the influence of a mineralizer, and establishes a method for crystal-optical determination of the size of single crystals
GOST 25734-1983 history
1996GOST 25734-1996 Alumina. Method for crystallooptic determination of monograins sizes in non-metallurgic alumina
1983GOST 25734-1983 Alumina. Method for the crystallooptic determination of monocrystals in non metallurgical alumina