Calcium Sulfate ½ -hyd

Product : CALCIUM SULFATE

HEMIHYDRATE

Available Grades : Extra Pure EP
Mol. Formula : CaSO4.½H2O
Mol. weight : 144.144
CASR No. 7778-18-9
     

EP

1.

Appearance

:

White powder

2.

Test solution (5%w/v suspension in dil HCl)

:

The suspension is free from foreign particles.

3.

Assay (as CaSO4.½H2O)

:

98% min.

4.

pH (20% aq. slurry in water)

:

6.5 to 8.5

5.

Maximum limits of impurities

i

Chloride, as Cl

:

0.02% max

ii

Carbonate, as CO3

:

0.02% max

iii

Iron, as Fe

:

0.005% max.

iv

Residue on Ignition, 500°C

:

92.0 – 95.5%

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