Molekula
Mercury (ll) oxide red
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Mercury(II) oxide red is a bright red inorganic compound primarily used as a pigment in ceramics, a reagent in chemical synthesis, and in the production of mercury-oxide batteries. It is also employed in analytical chemistry for redox titrations and as a mild oxidizing agent. This chemical has a CAS number of 21908-53-2, with the molecular formula HgO and a molecular weight of 216.5894. It should be stored at ambient conditions and handled with caution, as it carries a "Danger" signal word due to its toxicity. Molekula supplies Mercury(II) oxide red from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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100 g — £54.00 per pack ex VAT · £64.80 inc. VAT
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500 g — £210.00 per pack ex VAT · £252.00 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Red/ orange powder |
| Loss on Drying | ≤ 0.5% (105°C) |
| Chloride (Cl-) | ≤ 0.05% |
| Assay | ⩾ 99.0% |
| Residue on Ignition | ≤ 0.5% |
| Solubility in water | Insoluble in water |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 6.1 |
| Packing Group | II |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Heavy, bright orange powder |
| Odour | Odorless |
| Melting Point | 500 °C (decomp) |
Source: PubChem CID 30856 (HSDB)
Identification
| Property | Value |
|---|---|
| SKU | 56099385 |
| CAS Number | 21908-53-2 |
| IUPAC Name | oxomercury |
| EC Number | 244-654-7 |
| Molecular Formula | HgO |
| Molecular Weight | 216.5894 |
| Exact Mass | 217.9656 |
| SMILES | O=[Hg] |
| InChIKey | UKWHYYKOEPRTIC-UHFFFAOYSA-N |
| InChI | InChI=1S/Hg.O |
| PubChem CID | 30856 |
| UN Number | UN1641 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 28521010 |
| Tariff Code | 28521000 |
Safety & GHS
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Toxic
GHS06
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Serious Health Hazard
GHS08
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Hazardous to the Environment
GHS09
Hazard statements
- H300 +H310 + H330 Fatal if swallowed, in contact with skin or if inhaled
- H373 May cause damage to organs through prolonged or repeated exposure
- H400 Very toxic to aquatic life
- H410 Very toxic to aquatic life with long lasting effects
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P264 Wash thoroughly after handling
- P273 Avoid release to the environment
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P284 Wear respiratory protection
- P301+310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician
Documents
Safety Data Sheets (SDS)
Available in English, English (US), French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- MERCURIC OXIDE
- Mercuric oxide, red
- Mercuric oxide, yellow
- Mercury oxide (HgO)
- Mercury(II) oxide
- oxomercury
- Red mercuric oxide
- Red Precipitate
- Santar
- Santar M
Frequently asked questions
What are the primary applications of red mercury(II) oxide?
Red mercury(II) oxide is primarily used as a reagent in analytical chemistry, in the manufacture of mercury-oxide batteries, and as a catalyst in certain chemical reactions.
What is the chemical formula and molecular weight of red mercury(II) oxide?
The chemical formula is HgO, and the molecular weight is 216.5894 g/mol.
How should red mercury(II) oxide be stored?
Store at ambient temperature in a tightly sealed container, away from incompatible substances and moisture.
What purity grades are available for red mercury(II) oxide?
Molekula supplies red mercury(II) oxide in technical and reagent grades, with purity typically ≥98%.
Can Molekula supply red mercury(II) oxide in bulk quantities?
Yes, bulk quantities are available upon request—contact our sales team for pricing and lead times.
What documentation is provided with an order of red mercury(II) oxide?
Each order includes a Certificate of Analysis (CoA), Safety Data Sheet (SDS), and a product specification sheet.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.