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.

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, also called barite or Blanc Fixe, CAS 7727-43-7, is a white high-density inorganic filler supplied for coatings, plastics, drilling and pharmaceutical applications. Confirm the required grade, particle size and whiteness, then request a quotation with COA/TDS/SDS for bulk supply.

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 CAS 7727-43-7 is a white, odorless, high-density inorganic filler, also known as barite or Blanc Fixe, with molecular formula BaSO4, molecular weight about 233.39 and EINECS 231-784-4.

Synonyms: Barite; Blanc Fixe; Sulfuric acid barium salt; C.I. Pigment White 21; Barytes; Heavy Spar.

CAS: 7727-43-7.

It has the molecular formula BaSO4 and a molecular weight of about 233.39 g/mol.

It appears as a white, odorless powder.

It is chemically inert and nearly insoluble in water, dilute acid and alkali.

Natural barite is ground ore with coarser particle size, while precipitated barium sulfate (Blanc Fixe) is synthesized for higher purity, finer particle size and higher whiteness.

Precipitated grades provide high gloss, defined particle size and narrow particle size distribution.

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.

Natural barite powder is used in drilling fluids and friction materials.

Surface treatment such as stearic acid or coupling agents improves dispersion in organic polymers.

Store in a cool, dry, well-ventilated area in tightly closed containers away from moisture.

Protect from moisture and keep containers closed when not in use.

Confirm appearance, BaSO4 content, particle size (D50), whiteness and grade as required.

Use suitable dust and eye protection during handling, and wash skin contact with soap and water.

Confirm packaging with the requested quantity and destination requirements.

The page is an RFQ entry point and does not state stock, price, MOQ or fixed lead time.

For an RFQ, state the intended application, required grade, particle size, whiteness, quantity, packaging, destination and document needs.

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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