Minimum assay (MgO).................................................................... 20,0 %

Minimum assay (SiO2)..................................................................... 45,0 %

Ratio SiO2-MgO.......................................................................... 2,10-2,37

Identity according to Pharmacopoeias................................................ p/t.

MAX. IMPURITIES

Residual solvents (Ph.Eur./USP)............................................................ p/t

Acid consuming capacity..................................................................... p/t.

Alkalinity............................................................................................... p/t.

Soluble salts..................................................................................... 1,5 %

Loss on ignition at 900°C.......................................................17,0-34,0 %

Chloride (Cl).................................................................................. 0,055 %

Sulphate (SO4).................................................................................. 0,5 %

Heavy metals (as Pb).................................................................... 0,003 %

As............................................................................................... 0,0008 %