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Barium Sulfate CAS 7727-43-7 High Purity BaSO4 Powder Manufacturer
| MOQ: | 500g, 1kg or 25kg for sample, 1000kg for commercial order |
| Standard Packaging: | Net Weight 25kg or 200kg/package |
| Delivery Period: | In 3 working days |
| Payment Method: | T/T,LC,OA |
| Supply Capacity: | 3000 Tons/month |
Barium Sulfate CAS 7727-43-7 – BaSO4 Powder
Product Introduction
Barium sulfate, CAS No. 7727-43-7, is an inorganic compound with the molecular formula BaSO4. It is widely known as barite in its natural mineral form and blanc fixe when produced as a high-purity precipitated white powder. Barium sulfate is a heavy, white, odorless and chemically inert powder with high density, excellent acid/alkali resistance, low oil absorption and strong hiding power.
Due to its unique physical and chemical stability, barium sulfate CAS 7727-43-7 is used in paints, coatings, plastics, rubber, inks, paper, adhesives, oil and gas drilling fluids, ceramic materials and medical contrast media. It is insoluble in water, dilute acids and organic solvents, making it a safe and durable functional filler and pigment extender.
We supply both natural barite powder and precipitated barium sulfate/blanc fixe in various particle sizes, whiteness, purity and oil absorption levels for industrial and specialty applications.
Physical and Chemical Specifications
| Parameter | Specification / Typical Value |
|---|---|
| Chemical Name | Barium sulfate |
| Synonyms | Barite, baryte, blanc fixe, barium sulphate |
| CAS Number | 7727-43-7 |
| EINECS Number | 231-784-4 |
| Molecular Formula | BaSO4 |
| Molecular Weight | 233.39 g/mol |
| Appearance | White, odorless, fine powder |
| BaSO4 Purity | 96.0 – 99.5% depending on grade |
| pH (10% aqueous slurry) | 6.0 – 8.5 |
| Density | 4.2 – 4.5 g/cm³ |
| Bulk Density | 0.8 – 1.4 g/cm³ |
| Solubility in Water | 0.0002448 g/100 mL at 20°C |
| Melting Point | Approx. 1580°C (decomposes) |
| Boiling Point | Decomposes, no true boiling point |
| Whiteness (L* value) | ≥ 95 for precipitated grade |
| Oil Absorption | 10 – 20 g/100 g |
| Particle Size D50 | 0.5 – 5 μm precipitated; 2 – 10 μm natural barite |
| Residue on 325 Mesh | ≤ 0.01% |
| Loss on Ignition | ≤ 0.5% |
| Moisture Content | ≤ 0.2% |
| Iron (Fe) Content | ≤ 0.005% |
| Heavy Metals (as Pb) | ≤ 10 ppm |
| Acid Soluble Matter | ≤ 0.3% |
| Hardness (Mohs, natural barite) | 3.0 – 3.5 |
| Refractive Index | 1.636 – 1.648 |
Typical values may vary according to product grade, particle size and manufacturing process.
Product Functions
Barium sulfate CAS 7727-43-7 offers multiple functional benefits:
- High density and specific gravity – adds weight and mass without changing material volume significantly.
- Excellent chemical inertness – resistant to acids, alkalis, solvents, weathering and corrosion.
- High whiteness and opacity – improves brightness, hiding power and gloss in coatings and plastics.
- Low oil absorption – allows higher filling content while maintaining good processing properties.
- Excellent dispersibility – blends uniformly into resin, emulsion, ink and polymer systems.
- Low abrasiveness – protects processing equipment and extends tool life.
- Thermal and UV stability – helps improve long-term weather resistance and anti-aging performance.
- X-ray opacity – used as radiopaque contrast agent in medical diagnostics.
- Non-toxic and environmentally safe – suitable for applications with strict regulatory requirements.
Application Areas
Barium sulfate CAS 7727-43-7 is used in a wide range of industries:
1. Paints and Coatings
Used as a high-performance extender pigment in architectural paints, industrial coatings, powder coatings, automotive coatings, anti-corrosion coatings, marine paints and UV-curable coatings. It improves whiteness, gloss, hardness, adhesion and weather resistance.
2. Plastics and Rubber
Used as a filler and reinforcing agent in PP, PE, PVC, ABS, nylon, polyurethane, rubber gaskets, seals, tires and cable compounds. It improves density, dimensional stability, heat resistance, surface finish and processing efficiency.
3. Inks and Printing
Applied in offset inks, gravure inks, screen printing inks and UV inks to increase viscosity, opacity, abrasion resistance and pigment dispersion, while reducing production cost.
4. Paper and Paper Coatings
Used as a coating pigment and filler to improve paper smoothness, brightness, opacity and printability.
5. Adhesives and Sealants
Improves sag resistance, density, mechanical strength and chemical resistance in construction adhesives, sealants, caulks and mastics.
6. Oil and Gas Drilling Fluids
Natural barite is the primary weighting agent in drilling muds to control formation pressure and stabilize boreholes.
7. Medical and Pharmaceutical
Precipitated barium sulfate with high purity is used as an oral or rectal radiopaque contrast agent for X-ray and CT imaging of the gastrointestinal tract.
8. Construction Materials
Used in soundproofing materials, radiation shielding concrete, heavy concrete, tiles, artificial stone and self-leveling compounds.
9. Ceramics and Friction Materials
Improves density and thermal stability in ceramic glazes, brake pads, clutch facings and friction linings.
10. Automotive and Transportation
Used in automotive coatings, body fillers, brake pads, underbody coatings and noise-damping materials.
Manufacturing Process
Barium sulfate is produced by two main methods:
1. Natural Barite Processing
Natural barite ore is mined, crushed, ground, classified and purified. The process typically includes:
- Mining and sorting high-grade barite ore
- Crushing and grinding to desired particle size
- Flotation or gravity separation to remove impurities
- Magnetic separation and bleaching to improve whiteness
- Drying and packaging
Natural barite powder is mainly used in drilling fluids and general industrial fillers.
2. Precipitated Barium Sulfate (Blanc Fixe) Production
High-purity precipitated barium sulfate is manufactured through chemical precipitation:
- Reacting barium sulfide or barium carbonate solution with sulfuric acid or sodium sulfate
- Controlled precipitation to form fine, uniform BaSO4 particles
- Washing to remove soluble impurities
- Filtration and dewatering
- Drying and pulverizing
- Classification and surface treatment if required
Precipitated barium sulfate offers higher whiteness, finer particle size, lower impurities and better dispersion than natural barite, making it suitable for high-end coatings, inks, plastics and medical applications.
Why Choose Us
- High purity and consistent quality – BaSO4 content up to 99.5% with strict batch-to-batch control.
- Multiple product grades – natural barite powder, precipitated barium sulfate, surface-treated grades and nano/micron particle sizes.
- Customized specifications – particle size, whiteness, oil absorption, pH and moisture can be adjusted to your application.
- Technical support – experienced engineers help optimize filler loading, dispersion and formulation.
- Global supply capability – fast delivery to North America, Europe, Asia, Middle East, Africa and Latin America.
- Stable supply chain – reliable raw material sourcing and sufficient production capacity.
- Quality assurance – tested per ASTM, ISO and industry standards; COA available for each batch.
- Flexible packaging – 25 kg bags, 500 kg bulk bags, 1000 kg jumbo bags or custom packaging.
- Competitive pricing – factory-direct supply reduces total cost without compromising quality.
FAQ
1. What is the CAS number for barium sulfate?
The CAS number for barium sulfate is 7727-43-7. Its molecular formula is BaSO4.
2. Is barium sulfate soluble in water?
No. Barium sulfate is practically insoluble in water, with a solubility of only 0.0002448 g/100 mL at 20°C. It is also insoluble in dilute acids, alkalis and organic solvents.
3. What is the difference between natural barite and precipitated barium sulfate?
Natural barite is mined and ground from barite ore. It typically has wider particle size distribution, slightly lower whiteness and higher impurity content. Precipitated barium sulfate, also called blanc fixe, is chemically synthesized and offers higher purity, finer and more uniform particle size, and better whiteness and dispersion.
4. Is barium sulfate safe to use?
Yes. Barium sulfate is chemically inert, non-toxic and generally considered safe for industrial use. However, it should not be inhaled as fine dust. Medical-grade barium sulfate is used as a contrast agent because it is not absorbed by the gastrointestinal tract.
5. Can barium sulfate be used in food contact materials?
High-purity barium sulfate grades can be used in food-contact packaging and plastics in some regions, but final compliance depends on local regulations and specific product formulation. Please provide your requirements for confirmation.
6. What particle size is available?
We supply a range of particle sizes, typically D50 from 0.5 μm to 10 μm. Ultrafine and surface-treated grades are also available upon request.
7. Can I get a free sample?
Yes, we can provide free samples for evaluation. Shipping cost may be required depending on the destination.
8. How should barium sulfate be stored?
Store in a dry, cool and well-ventilated area. Keep bags closed when not in use to prevent moisture absorption and contamination. Avoid generating dust during handling.
9. What is the shelf life?
Barium sulfate powder has a long shelf life of 24 months or more when stored under recommended conditions.
10. How can I place an order?
Contact us with the required purity, particle size, whiteness, packaging and target application. We will provide a detailed quotation and technical data sheet.
