Barium sulfide
Barium sulfide (BaS) is an inorganic compound with CAS 21109-95-5 and a molecular weight of 169.39 g/mol. This white solid is a key source of barium ions and is utilized in diverse chemical applications. It serves as a precursor in the synthesis of other barium compounds and finds utility in the production of pigments, phosphors, and in certain specialized materials science applications.

Chemical Synthesis
Barium sulfide acts as a crucial intermediate for the preparation of various other barium-containing compounds. Its reactivity allows for diverse synthetic pathways in inorganic chemistry.
Pigment Production
It has historically been used in the manufacturing of pigments, contributing to colouration in various industrial products. Its properties are leveraged for specific pigment formulations.
Phosphor Materials
Barium sulfide is a component in the creation of phosphorescent materials. These are used in applications requiring luminescence, such as glow-in-the-dark products.
Materials Science
The compound finds applications in materials science research, particularly in the development of chalcogenides and other advanced inorganic materials. Its properties are explored for novel material functionalities.
| Molecular weight | 169.39 |
|---|---|
| Linear formula | BaS |
| Assay | 99.9% |
| Density | 4.25 g/mL at 15 °C(lit.) |



Hazard statements
- H290May be corrosive to metals
- H301Toxic if swallowed
- H314Causes severe skin burns and eye damage
- H332Harmful if inhaled
- H400Very toxic to aquatic life
Precautionary statements
- P273Avoid release to the environment
- P280Wear protective gloves, clothing and eye/face protection
- P301IF SWALLOWED
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Transport (UN / ADR) | UN 2813 4.3 / PGII |
| Water hazard class (WGK, DE) | 2 |
| Hazard codes (EU) | C,N |
| Risk statements (R) | 20/22-31-35-41-50 |
| Safety statements (S) | 28-61 |
| Supplemental hazards | Contact with acids liberates toxic gas. |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Barium sulfide used for?
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Barium sulfide (BaS) is used as a chemical intermediate for synthesising other barium compounds, in the production of pigments and phosphors, and in materials science applications.
What are the CAS number and formula for Barium sulfide?
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The CAS number for Barium sulfide is 21109-95-5, and its chemical formula is BaS.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Barium sulfide with an assay of 99.9%. We do not represent this product as USP, BP, EP, or other pharmacopoeia grades unless explicitly stated.
How should Barium sulfide be handled safely?
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Barium sulfide is classified as Danger, presenting hazards including severe skin burns and eye damage, and toxicity if swallowed or inhaled (H301, H314, H332). It is also harmful to aquatic life (H400). Contact with acids liberates toxic gas. Always wear appropriate personal protective equipment, including a dust mask (N95), eyeshields, and gloves. Ensure good ventilation and avoid contact with acids.
Is Barium sulfide a controlled substance?
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The provided data does not indicate that Barium sulfide is a controlled substance under standard regulations. Please consult local regulations for specific import/export requirements.
How is Barium sulfide packed and shipped?
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Barium sulfide is shipped as UN 2813, Hazard Class 4.3, Packing Group II. Specific packaging details adhere to international transport regulations. TSS is a global supplier and exporter.
How can I request a quote or sample?
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To request a quote or sample of Barium sulfide, please contact the Tech Serve Solutions sales team through our website or by phone.
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