Mercury(II) oxide
Mercury(II) oxide (CAS 21908-53-2; HgO; MW: 216.59) is a red or yellow crystalline solid. This compound is primarily used in catalysis, chemical synthesis, and materials science. Its distinct chemical properties make it a valuable reagent in various inorganic and materials research applications. Tech Serve Solutions supplies Mercury(II) oxide with an assay of 98%, suitable for research and industrial use.
- IUPAC
- Mercuric oxide

Catalysis and Inorganic Chemistry
Mercury(II) oxide serves as a reagent or precursor in various inorganic reactions and catalytic processes. Its ability to participate in redox reactions is fundamental to its utility in these fields.
Chemical Synthesis
This compound is employed in organic and inorganic synthesis for the preparation of other mercury compounds or as an oxidizing agent. It is a key component in specific synthetic routes requiring controlled mercury introduction.
Materials Science
Mercury(II) oxide can be utilized in the development and study of novel materials. Its properties are investigated for potential applications in advanced material formulations.
| Molecular weight | 216.59 |
|---|---|
| Empirical formula | HgO |
| Assay | 98% |
| Form | powder |
| Impurities tested | ≤0.005% N compounds≤0.03% insol. dil. HCl |
| Melting point | 500 °C (dec.)(lit.) |



Hazard statements
- H300Fatal if swallowed
- H310Fatal in contact with skin
- H330Fatal if inhaled
- H373May cause damage to organs through prolonged exposure
- H410Very toxic to aquatic life with long-lasting effects
Precautionary statements
- P260Do not breathe dust, fume, gas, mist, vapours or spray
- P264Wash thoroughly after handling
- P273Avoid release to the environment
- P280Wear protective gloves, clothing and eye/face protection
- P284Wear respiratory protection
- P301IF SWALLOWED
| Protective equipment | Eyeshields, Faceshields, full-face particle respirator type N100 (US), Gloves, respirator cartridge type N100 (US), type P1 (EN143) respirator filter, type P3 (EN 143) respirator cartridges |
|---|---|
| Transport (UN / ADR) | UN 1641 6.1 / PGII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | T+,N |
| Risk statements (R) | 26/27/28-33-50/53 |
| Safety statements (S) | 13-28-45-60-61 |
| Cation traces | Fe: ≤0.005% |
| Anion traces | chloride (Cl-): ≤0.025%sulfate (SO42-): ≤0.015% |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Reduction Residue | ≤0.025% |
|---|---|
| Ign Residue After Reduction | ≤0.05% |
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 Mercury(II) oxide used for?
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Mercury(II) oxide is used in catalysis, chemical synthesis, and materials science.
What are the CAS number and chemical formula for Mercury(II) oxide?
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The CAS number is 21908-53-2, and the chemical formula is HgO.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Mercury(II) oxide with an assay of 98%. This is a technical/research grade material, and we do not represent it as USP, BP, or EP grade.
What are the safety and handling considerations for Mercury(II) oxide?
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Mercury(II) oxide is highly toxic and an environmental hazard. It is fatal if swallowed, in contact with skin, or if inhaled (H300-H310-H330). It may cause damage to organs through prolonged or repeated exposure (H373) and is very toxic to aquatic life with long-lasting effects (H410). Appropriate personal protective equipment, including eyeshields, gloves, and a suitable respirator, must be used. Handle only in a well-ventilated area or under a fume hood.
Is Mercury(II) oxide a controlled substance?
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While not explicitly listed as a controlled substance in all jurisdictions, Mercury(II) oxide is highly toxic and regulated due to its mercury content and environmental impact. Proper handling, disposal, and adherence to all relevant regulations are mandatory.
How is Mercury(II) oxide packed, shipped, and exported?
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Mercury(II) oxide is packed according to safety regulations for hazardous materials, UN 1641, Class 6.1, Packing Group II. We ensure all shipments comply with international export regulations for hazardous chemicals.
How can I request a quote or sample?
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To request a quote or sample of Mercury(II) oxide, please contact our sales team through the website or by phone, providing your specific requirements.
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