Key Properties of Calcium Sulphate
| Product Name: | Calcium Sulphate |
| Synonyms: | Calcium Sulphate Dihydrate |
| CAS No: | 10101-41-4 |
| Chemical Formula: | CaSO₄·2H₂O |
| Grade: | BP / USP |
| Appearance: | White or almost white fine powder. |
| Molar Mass: | 172.2 g/mol |
| Solubility: | Very slightly soluble in water; practically insoluble in ethanol (96 per cent). |
| Melting Point: | 1460°C (Decomposes) |
Manufacturing process of Calcium Sulphate
Step 1: Raw Material Selection
High-purity calcium carbonate and sulfuric acid are selected.
Raw materials undergo strict quality checks for purity.
Step 2: Chemical Reaction & Processing
Calcium carbonate reacts with sulfuric acid to form Calcium Sulphate.
The solution is filtered and refined to remove impurities.
Step 3: Crystallization & Drying
The solution is evaporated, crystallized, and dried to achieve the required purity.
Step 4: Quality Control & Testing
The product is tested for assay, solubility, moisture content, and pH as per IP/BP/USP standards.
Step 5: Packaging & Storage
Packed in HDPE bags or fiber drums to prevent contamination.
Stored in a cool, dry place to maintain stability.
Applications of Calcium Sulphate
Technical Specifications of Calcium Sulphate
Calcium Sulphate BP Specification
| Sr. No. | Test | Specification |
|---|---|---|
| 1 | Description | White or almost white fine powder. |
| 2 | Solubility | Very slightly soluble in water; practically insoluble in ethanol (96 per cent). |
| 3 | Identification by Sulphate | It gives reaction of Sulphate. |
| 4 | Identification by Calcium | It gives reaction of Calcium. |
| 5 | Acidity or Alkalinity | Complies with the prescribed test. |
| 6 | Chlorides | Not more than 300 ppm |
| 7 | Iron | Not more than 100 ppm |
| 8 | Loss on Ignition | 18.00% to 22.00% |
| 9 | Assay | Not less than 98.00% to Not more than 102.00% |
Calcium Sulphate USP Specification
| Sr. No. | Test | Specification |
|---|---|---|
| 1 | Description | White or almost white fine powder. |
| 2 | Solubility | Very slightly soluble in water; practically insoluble in ethanol (96 per cent). |
| 3 | Identification by Sulphate | It gives reaction of Sulphate. |
| 4 | Identification by Calcium | It gives reaction of Calcium. |
| 5 | Iron | Not more than 100 ppm |
| 6 | Loss on Ignition | 19.00% to 23.00% |
| 7 | Assay | Not less than 98.00% to Not more than 101.00% |
Packing and Storage condition of Calcium Sulphate
Packing:
Packed in 25 kg / 50 kg HDPE bags with inner LDPE liner for moisture protection.
Available in fiber drums or plastic drums for high-purity grades.
Bulk packaging in jumbo bags (500 kg – 1000 kg) available upon request.
Storage:
Store in a cool, dry, and well-ventilated area away from direct sunlight.
Why Choose Chemignition for
Calcium Sulphate Supply?
Quality Assurance
Grade Compliance
Calcium Sulphate is manufactured in adherence to stringent global pharmaceutical standards.
In-House Quality Control
Each batch undergoes rigorous testing for purity, stability, and efficacy.
Regulatory Approvals
Certified for export and compliant with international regulatory requirements.
Large-Scale Manufacturing and Export
Grade Compliance
Calcium Sulphate is manufactured in adherence to stringent global pharmaceutical standards.
In-House Quality Control
Each batch undergoes rigorous testing for purity, stability, and efficacy.
Regulatory Approvals
Certified for export and compliant with international regulatory requirements.





