ALUMINIUM POTASSIUM SULFATE
Prepared at the 55th JECFA (2000) and published in the Combined Compendium of Food Additive Specifications, FAO JECFA Monographs 1
(2005). A PTWI of 2 mg/kg bw for aluminium was established at the 74thJECFA (2011).
SYNONYMS Potassium alum; potash alum; Burnt alum (anhydrous); INS No. 522
Chemical names Aluminium potassium sulfate dodecahydrate
Aluminium potassium sulfate anhydrous
C.A.S. number 7784-24-9 (dodecahydrate) 10043-67-1 (anhydrous)
Chemical formula AlK(SO4)2 · xH2O (x = 0 or 12)
Formula weight 474.38 (dodecahydrate) 258.21 (anhydrous)
Assay Dodecahydrate: not less than 99.5%
Anhydrous form: not less than 96.5%
DESCRIPTION Large, transparent crystals or crystalline fragments, or white crystalline powder; odourless
FUNCTIONAL USES Acidity regulator, firming agent, raising agent
