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Barium sulfate

Barium sulfate

Basic Information

CAS No.: 7727-43-7
Molecular Formula: BaO4S
Molecular Weight: 233.39

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Product Details

Barium Sulfate is a white crystalline powder, insoluble in water, acids and alkalis. It has high whiteness, good weather resistance, chemical inertness and excellent hiding power. It is widely used in coatings, plastics, rubber, paints, paper making, ceramics and as a contrast agent in medical radiography.


Chemical Properties

PropertyValue
Melting point

1580 °C

Boiling point

Decomposes at 1580℃ [KIR78]

Density

4.5

Storage temp.

Storage temperature: no restrictions.

Solubility

Water: insoluble

Form

Powder

Color

White to yellow

Specific Gravity

4.5

PH Range

7

PH

3.5-10.0 (100g/l, H2O, 20℃)suspension

Odor

wh. or ylsh. fine powd. free from grittiness, odorless, tasteless

Water Solubility

0.0022 g/L (50 ºC)

Crystal Structure

Barite

Crystal system

Nogata

Merck

14,994

Solubility Product Constant (Ksp)

pKsp: 9.97

Space group

Pnma

Lattice constant

a/nmb/nmc/nmα/oβ/oγ/oV/nm30.89090.54670.7188909090

Dielectric constant

11.4(16.0℃)

Exposure limits

ACGIH: TWA 5 mg/m3OSHA: TWA 15 mg/m3; TWA 5 mg/m3NIOSH: TWA 10 mg/m3; TWA 5 mg/m3

Stability:

Stable.

LogP

-1.031 (est)

CAS DataBase Reference

7727-43-7(CAS DataBase Reference)

EPA Substance Registry System

Barium sulfate (7727-43-7)


Safety Information

PropertyValue
Safety descriptions24/25
WGK Germany1
RTECS numberVZ0950000
TSCATSCA listed
HS code28363000
Storage class11 - Combustible solids
Hazardous substances data144-55-8 (Hazardous Substances Data)
ToxicityLD50 orally in Rabbit: 4220 mg/kg


Product Usage

Barium sulfate is a high-density, chemically inert white powder. In the medical field, it serves as the core component of barium meal contrast agents; when ingested by patients, it clearly outlines the digestive tract for X-ray examination and diagnosis of stomach and intestinal diseases. In the coatings industry, it is used as an extender pigment and filler, increasing film thickness, improving weather resistance and chemical resistance, while its high specific gravity and low oil absorption help reduce production costs. In the plastics and rubber industries, it enhances the rigidity, density, and surface gloss of products. Additionally, it plays important roles in inks, ceramics, and radiation shielding materials. Its advantages include non-toxicity, acid and alkali resistance, and high whiteness.

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