MAGNESIUM OXIDE
Prepared at the 17th JECFA (1973), published in FNP 4 (1978) and in FNP 52 (1992). Metals and arsenic specifications revised at the 57th JECFA
(2001). An ADI not limited' was established at the 9th JECFA (1965)
SYNONYMS INS No. 530
DEFINITION
Chemical names Magnesium oxide
C.A.S. number 1309-48-4
Chemical formula MgO
Formula weight 40.31
Assay Not less than 96.0% after ignition at about 800o
DESCRIPTION Very bulky white powder, known as light magnesium oxide, or as a relatively dense, white powder, known as heavy magnesium oxide. 5 g of light magnesium oxide occupy a volume of 40 to 50 ml, while 5 g of heavy magnesium oxide occupy a volume of 10 to 20 ml.
FUNCTIONAL USES Anticaking agent
