Barium sulfate
CAS 7727-43-7BaO4S233.39 g/mol
Barium sulfate is a metal sulfate with formula BaO4S. Virtually insoluble in water at room temperature, it is mostly used as a component in oil well drilling fluid it occurs naturally as the mineral barite. It has a role as a radioopaque medium. It is an inorganic barium salt, a metal sulfate and a barium salt.
IUPAC: barium(2+) sulfate
PubChem
Physical & Chemical Properties
| Melting Point | 2876 °F (NIOSH, 2024) |
| Boiling Point | 2912 °F at 760 mmHg (Decomposes) (NIOSH, 2024) |
| Density | 4.25 to 4.5 (NIOSH, 2024) |
| Solubility | 0.0002 % at 64 °F (NIOSH, 2024) |
| Vapor Pressure | 0 mmHg (approx) (NIOSH, 2024) |
| pH | 5% suspension in water is neutral to litmus paper |
| Appearance | Barium sulfate appears as white or yellowish odorless powder or small crystals. Mp: 1580 °C (with decomposition). Density: 4.25 -4.5 g cm-3. Insoluble in water, dilute acids, alcohol. Soluble in hot concentrated sulfuric acid. Used as a weighting mud in oil-drilling, in paints, paper coatings, linoleum, textiles, rubber. Administered internally ("barium cocktail") as a radio-opaque diagnostic aid. |
Data: PubChem · Last updated: 4/20/2026
GHS Classification
No GHS classification data available.
Classification data is sourced from ECHA.
Regulatory Compliance
TSCA
Listed
note: Status based on EPA TSCA Active Inventory · inventory name: TSCA Chemical Substance Inventory
View sourceGlobal Trade Intelligence
No trade flow data available for this chemical.
HS Code(s): 2833
Data: UN Comtrade
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