Mercury(I) chloride
Mercury(I) chloride (CAS: 10112-91-1, formula: Hg2Cl2) is a white crystalline solid with a molecular weight of 472.09 g/mol. Also known as calomel, this inorganic mercury salt is primarily utilised in chemical synthesis and as a reagent in inorganic chemistry. Its applications extend to research essential uses, where its specific chemical properties are leveraged for various laboratory procedures. Tech Serve Solutions supplies this compound with a high purity assay.
- IUPAC
- Calomel,Mercurous chloride
- Synonyms
- CalomelMercurous chloride

Chemical Synthesis
Mercury(I) chloride serves as a reagent in various organic and inorganic synthesis pathways. It can be used as a mild chlorinating agent or as a precursor for other mercury compounds.
Catalysis
In certain catalytic processes, mercury compounds, including Mercury(I) chloride, can play a role. Its specific catalytic activity is often observed in specialized organic transformations.
Laboratory Reagent
As a well-characterised inorganic salt, Mercury(I) chloride is employed as a standard reagent in analytical chemistry and general laboratory procedures. It is essential for various research applications.
Historical Applications
Historically, calomel was used in medicine, though such applications are now largely discontinued due to toxicity. Its chemical properties continue to be of interest in research settings.
| Molecular weight | 472.09 |
|---|---|
| Linear formula | Hg2Cl2 |
| Assay | ≥99.5% |
| Grade | ACS reagent |
| Impurities tested | ≤0.01% HgCl2 |
| Melting point | 400 °C (subl.)(lit.) |


Hazard statements
- H302Harmful if swallowed
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
- H410Very toxic to aquatic life with long-lasting effects
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P273Avoid release to the environment
- P305IF IN EYES
- P501Dispose of contents and container per local regulations
| Transport (UN / ADR) | UN 2025 6.1 / PGIII |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn,N |
| Risk statements (R) | 22-36/37/38-50/53 |
| Safety statements (S) | 13-24/25-46-60-61 |
| Anion traces | sulfate (SO42-): ≤0.01% |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Reduction Residue | ≤0.02% |
|---|
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(I) chloride used for?
+
Mercury(I) chloride is used in chemical synthesis, catalysis, and as a laboratory reagent for research essential purposes.
What is the CAS number and formula for Mercury(I) chloride?
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The CAS number for Mercury(I) chloride is 10112-91-1, and its formula is Hg2Cl2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Mercury(I) chloride in ACS reagent grade with an assay of ≥99.5%. It is not represented as USP, BP, or EP grade.
How should Mercury(I) chloride be handled?
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Mercury(I) chloride is harmful if swallowed, causes skin irritation, eye irritation, and may cause respiratory irritation. It is also toxic to aquatic life with long-lasting effects. Handle with appropriate personal protective equipment in a well-ventilated area. Refer to the Safety Data Sheet for full details.
How is Mercury(I) chloride packed and shipped?
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Mercury(I) chloride is packed according to relevant transport regulations, including UN 2025 classification for hazardous materials. TSS exports globally, adhering to all shipping and customs requirements.
How can I request a sample or quote for Mercury(I) chloride?
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To request a sample or quote, please use the contact form on our website or call our sales team, referencing product CAS 10112-91-1.
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