What is Barium Sulfate CAS 7727-43-7?

Barium sulfate is a white, odorless, high-density inorganic filler with the formula BaSO4 and molecular weight about 233.39 g/mol. It is chemically inert and nearly insoluble in water, dilute acid, and alkali.

What is the difference between natural barite and precipitated Barium Sulfate?

Natural barite is ground ore with coarser particle size and may have more impurities, so it is commonly used in drilling fluids and lower-cost fillers. Precipitated barium sulfate, or Blanc Fixe, is synthesized to provide higher purity, finer and narrower particle size, and higher whiteness.

Is Barium Sulfate harmful like soluble barium salts?

No. Soluble barium salts can release toxic barium ions, but barium sulfate is extremely insoluble in water and stomach acid. This insolubility prevents meaningful absorption of barium ions, making it suitable for purified pharmaceutical applications.

What are the main applications of Barium Sulfate in coatings and plastics?

It works as a functional extender pigment to improve gloss, hardness, chemical resistance, and whiteness. Fine precipitated grades are used in high-end paints, automotive coatings, powder coatings, engineering plastics, and masterbatches.

Which Barium Sulfate grade should be selected for pharmaceutical or superfine coating use?

For pharmaceutical use, select a purified, controlled-purity grade. For high-gloss coatings and plastics, choose a precipitated grade with tight particle size and high whiteness; natural barite is generally limited to drilling, friction materials, or less demanding fillers.

Barium Sulfate CAS 7727-43-7

Barium Sulfate CAS 7727-43-7 is a chemically inert, high-density inorganic compound chemically defined as the barium salt of sulfuric acid , functioning primarily as a functional filler and weighting agent in coatings, plastics, and oil drilling fluids. Available as natural Barite or chemically precipitated Blanc Fixe, this white, odorless powder is utilized to enhance the gloss and durability of automotive primers, improve the acoustic insulation of plastics, and serve as a radiopaque contrast agent. We provide professional access to this material with competitive factory pricing and the ability to meet customized specifications (ranging from API-grade drilling barite to ultrafine 0.7μm precipitated grades) for various manufacturing requirements. Our commitment to technical transparency ensures that every shipment is accompanied by comprehensive MSDS, TDS, COA documentation to support your quality assurance protocols, and we maintain capacity for consistent bulk supply to facilitate large-scale industrial operations.

CAS: 7727-43-7
Synonyms: Barite, Blanc Fixe, Sulfuric acid barium salt, C.I. Pigment White 21, Barytes, Heavy Spar
Einecs: 231-784-4
Molecular Formula: BaSO4
Grade: Precipitated Grade (Synthetic), Superfine Natural Grade, Coating Grade, Pharma Grade.
Package: 25kg Multi-layer Paper Valve Bag or 1000kg Jumbo Bag (Palletized).

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Product Description

Barium Sulfate is a chemically inert, high-density inorganic filler renowned for its exceptional stability and whiteness. Unlike other fillers, it is insoluble in water, acids, and alkalis, making it an ideal choice for harsh chemical environments.

Our Precipitated Barium Sulfate series is produced using advanced chemical precipitation methods, resulting in defined particle sizes, high gloss, and narrow particle size distribution. It functions as a functional extender in top-tier coatings and plastics, enhancing brilliance and surface hardness. We also supply Natural Barite Powder for drilling fluids and friction materials.

Need a specific particle size (D50) or whiteness level? 📧 Email: info@industrochem.com

We offer tailored solutions with specific surface treatments (stearic acid or coupling agents) to improve dispersion in organic polymers.

1 Physicochemical Properties (Technical Data)

2 Applications

3 Quality Assurance (QA/QC)

4 Storage, Handling & Safety

Physicochemical Properties (Technical Data)

The following data represents our High-Gloss Precipitated Grade, widely used in automotive coatings and engineering plastics. This specification aligns with top-tier export standards.

Property	Specification (Precipitated)
Appearance	Fine White Powder
BaSO4 Content	$\geq 98.0 %$
Whiteness (R457)	$\geq 98.0 %$
Average Particle Size (D50)	$0.7 - 1.0 μ m$ 0
Oil Absorption	$15 - 20 g / 100 g$
pH Value (Suspension)	6.5 – 8.0
Volatile Matter (105°C)	$\leq 0.3 %$
Iron (Fe)	$\leq 0.004 %$
Specific Gravity	$4.3 - 4.5 g / c m^{3}$
Solubility in Water	$\leq 0.1 %$

Applications

Barium Sulfate is a versatile functional material across various high-tech sectors:

1. Coatings, Paints & Inks:

Powder Coatings: Acts as a leveling agent to improve flow and gloss. Its chemical inertness provides excellent weather resistance.
Automotive Primers: Used for its “spacer” effect, optimizing the efficiency of Titanium Dioxide ( $T i O_{2}$ TiO2) pigments and reducing costs without sacrificing opacity.

2. Plastics & Rubber:

Engineering Plastics: Increases the specific gravity and surface hardness of ABS, PP, and PA. It also provides sound-dampening (acoustic insulation) properties.
Elastomers: Improves the aging resistance and acid resistance of rubber products.

3. Oil & Gas (Natural Grade):

Drilling Fluids: High-density natural barite is used as a weighting agent to suppress formation pressure and prevent blowouts in drilling muds.

4. Battery Industry:

Lead-Acid Batteries: Acts as an expander in the negative plate active mass to maintain capacity and prolong battery life.

Quality Assurance (QA/QC)

At Industrochem, we guarantee consistency through rigorous analytical testing under ISO 9001:2015 protocols.

Particle Size Analysis: We utilize Malvern Mastersizer Laser Diffraction to strictly monitor the D50 and D97 values. This ensures a narrow particle size distribution, preventing “oversize” particles that could cause surface defects in thin-film coatings.
Whiteness Control: Every batch is tested using a spectro-colorimeter to ensure $L^{*}$ L∗ values remain consistent, preventing color deviation in your final product.
Heavy Metal Screening: We use XRF (X-ray Fluorescence) and AAS (Atomic Absorption Spectroscopy) to ensure heavy metals (Pb, Cd, Hg) are well below RoHS and REACH limits, making our product safe for consumer goods.

For titanium dioxide used alongside barium sulfate in pigment and coating systems, see Titanium Dioxide.

Storage, Handling & Safety

Storage Conditions:

Environment: Store in a cool, dry, and well-ventilated area.
Moisture: Although Barium Sulfate is insoluble, the powder can agglomerate (clump) if exposed to high humidity. Keep pallets wrapped and bags sealed.
Segregation: Store away from reduction agents.

Safety Precautions (HSE):

Toxicity: Barium Sulfate is generally considered non-toxic due to its extreme insolubility in the body (unlike soluble barium salts). However, industrial hygiene is required.
Dust Hazard: Prolonged inhalation of high concentrations of dust may cause benign pneumoconiosis (Baritosis).
PPE Recommendations:
- Respiratory: Use a NIOSH-approved dust mask (N95 or P2 rating) during handling and mixing.
- Eyes: Safety goggles to prevent mechanical irritation.
- Skin: Wear long sleeves and gloves to minimize skin drying.

Optimize your formulation with high-purity Barium Sulfate.

From weighting agents to high-gloss extenders, we deliver the quality you need.

👉 Get a Quote: info@industrochem.com

FAQ - Technical & Supply Chain

Q:
What is Barium Sulfate CAS 7727-43-7?

A: Barium sulfate is a white, odorless, high-density inorganic filler with the formula BaSO4 and molecular weight about 233.39 g/mol. It is chemically inert and nearly insoluble in water, dilute acid, and alkali.
Q:
What is the difference between natural barite and precipitated Barium Sulfate?

A: Natural barite is ground ore with coarser particle size and may have more impurities, so it is commonly used in drilling fluids and lower-cost fillers. Precipitated barium sulfate, or Blanc Fixe, is synthesized to provide higher purity, finer and narrower particle size, and higher whiteness.
Q:
Is Barium Sulfate harmful like soluble barium salts?

A: No. Soluble barium salts can release toxic barium ions, but barium sulfate is extremely insoluble in water and stomach acid. This insolubility prevents meaningful absorption of barium ions, making it suitable for purified pharmaceutical applications.
Q:
What are the main applications of Barium Sulfate in coatings and plastics?

A: It works as a functional extender pigment to improve gloss, hardness, chemical resistance, and whiteness. Fine precipitated grades are used in high-end paints, automotive coatings, powder coatings, engineering plastics, and masterbatches.
Q:
Which Barium Sulfate grade should be selected for pharmaceutical or superfine coating use?

A: For pharmaceutical use, select a purified, controlled-purity grade. For high-gloss coatings and plastics, choose a precipitated grade with tight particle size and high whiteness; natural barite is generally limited to drilling, friction materials, or less demanding fillers.

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