Description
Red Gypsum is synthetic gypsum precipitated by the neutralization of liquor containing ferrous sulphate and sulphuric acid. This consists of finely distributed calcium sulphate particulate matter.
Application
White Gypsum is used for land filling, construction blocks, gypsum board etc.
Chemical name
Mixture of Calcium sulfate dihydrate and hydrated Iron Oxide- CaSO4.2H2O + Ferrous Sulphate -FeSO4
HS Code- 25202090
CHARACTERISTICS / CHEMICAL COMPOSITION
| Characteristics | Requirement | Typical result |
| Colour | Reddish brown | Reddish brown |
| PH (20% Slurry in water) | >7.0 | 8.5 |
| Purity as CaSO4.2H2O | 50-70% | 65 % |
| Total Iron | 20-30% | 25 % |
| Moisture | 5-10% | 5 % |