Synonyms

Sodium silicoaluminate; Sodium aluminosilicate; Aluminium sodium silicate

Einecs

Chemical name

Sodium aluminium silicate

Chemical formula

Molecular weight

Assay

Content on the anhydrous basis:

• as SiO₂ not less than 66,0 % and not more than 88,0 %

• as Al₂O₃ not less than 5,0 % and not more than 15,0 %

Description

Fine white amorphous powder or beads

Test for sodium

Passes test

Test for aluminium

Passes test

Test for silicate

Passes test

pH

Between 6,5 and 11,5 (5 % slurry)

Loss on drying

Not more than 8,0 % (105 °C, 2 hours)

Loss on ignition

Not less than 5,0 % and not more than 11,0 % on the anhydrous basis (1 000 °C to constant weight)

Sodium

Not less than 5 % and not more than 8,5 % (as Na₂O) on the anhydrous basis

Arsenic

Not more than 3 mg/kg

Lead

Not more than 5 mg/kg

Mercury

Not more than 1 mg/kg