Specifications of Precipitated Calcium Sulfate Dihydrate
Color: Snow White
Odor: Neutral
Assay: >99.9%
pH: 7 approximate
Iron as Fe: <20ppm
Chloride as Cl: <150ppm
Loss on drying (LOD): 20.15%
Heavy Metals as Pb: <2ppm
Specific Gravity: 0.6 gms/cc
SIEVE ANALYSIS
Through 100 mesh: 100%
Through 300 mesh: 98 %

Specifications of Calcium Sulfate USP Grade
CaSO4-136.14
Sulfuric acid, calcium salt (1:1)
Calcium sulfate (1:1) 136.14
Dihydrate 172.17

CHARACTERS
Appearance: White or almost white fine powder.
Solubility: Very slightly soluble in water, practically insoluble in ethanol (96 per cent).

IDENTIFICATION
Loss on ignition.
Solution S gives reaction of sulphates.
Solution S gives reaction of calcium.

TESTS
Solution S: Dissolve 1.0 g in 50 ml of a 10 per cent V/V solution of hydrochloric acid R by heating at 50C for 5 min. Allow to cool.
Acidity or alkalinity: Shake 1.5 g with 15 ml of carbon dioxide-free water for 5 min. Allow to stand for 5 min and filter. To 10 ml of the filtrate add 0.1 ml of phph solution and 0.25 ml of 0.01 M sodium hydroxide. The solution is red. Add 0.30 ml of 0.01 M hydrochloric acid. The solution is colourless. Add 0.2 ml of methyl red solution. The solution is reddish-orange.
Chlorides: Maximum 300 ppm.
Shake 0.5 g with 15 ml of water R for 5 min. Allow to stand for 15 min and filter. Dilute 5 ml of the filtrate to 15 ml with water.
Arsenic: Maximum 10 ppm, determined on 5 ml of solution S.
Iron: Maximum 100 ppm.
To 0.25 g add a mixture of 5 ml of hydrochloric acid R and 20 ml of water R. Heat to boiling, cool and filter.
Heavy metals: Maximum 20 ppm.
To 2.5 g add a mixture of 2 ml of hydrochloric acid R and 15 ml of water R. Heat to boiling. Cool and then add 0.5 ml of phph solution R. Cautiously add concentrated ammonia until the colour changes to pink. Add 0.5 ml of glacial acetic acid R and dilute to 25 ml with water R. Filter. 12 ml of the filtrate complies with test A. Prepare the reference solution using lead standard solution (2 ppm Pb.
Loss on ignition: 18.0 per cent to 22.0 per cent, determined on 1.000 g by ignition to constant mass at 800 ± 50C.

TESTS
Solution S: Dissolve 1.0 g in 50 ml of a 10 per cent V/V solution of hydrochloric acid R by heating at 50C for 5 min. Allow to cool.
Acidity or alkalinity: Shake 1.5 g with 15 ml of carbon dioxide-free water for 5 min. Allow to stand for 5 min and filter. To 10 ml of the filtrate add 0.1 ml of phph solution and 0.25 ml of 0.01 M sodium hydroxide. The solution is red. Add 0.30 ml of 0.01 M hydrochloric acid. The solution is colourless. Add 0.2 ml of methyl red solution. The solution is reddish-orange.
Chlorides: Maximum 300 ppm.
Shake 0.5 g with 15 ml of water R for 5 min. Allow to stand for 15 min and filter. Dilute 5 ml of the filtrate to 15 ml with water.
Arsenic: Maximum 10 ppm, determined on 5 ml of solution S.
Iron: Maximum 100 ppm.
To 0.25 g add a mixture of 5 ml of hydrochloric acid R and 20 ml of water R. Heat to boiling, cool and filter.
Heavy metals: Maximum 20 ppm.
To 2.5 g add a mixture of 2 ml of hydrochloric acid R and 15 ml of water R. Heat to boiling. Cool and then add 0.5 ml of phph solution R. Cautiously add concentrated ammonia until the colour changes to pink. Add 0.5 ml of glacial acetic acid R and dilute to 25 ml with water R. Filter. 12 ml of the filtrate complies with test A. Prepare the reference solution using lead standard solution (2 ppm Pb.
Loss on ignition: 18.0 per cent to 22.0 per cent, determined on 1.000 g by ignition to constant mass at 800 ± 50C.

Specifications of Calcium Sulfate FCC Food Grade
CaSO4 Formula weight, anhydrous 136.14
CaSO4-2H2O Formula weight, dihydrate 172.18
INS: 516 CAS: anhydrous 7778-18-9
CAS: dihydrate 10101-41-4

DESCRIPTION
Calcium Sulfate occurs as a fine, white to slightly yellow-white powder. It is anhydrous or contains two molecules of water of hydration.
Function: Nutrient; yeast food; dough conditioner; firming agent; sequestrant.

Specifications of Calcium Sulfate Dihydrate Analytical Reagent Grade
Also Called Calcium Sulphate Dihydrate
CaSO4-2H2O
Formula Wt 172.17
CAS Number 10101-41-4