Substance profile
Mercury cyanide oxide (Hg2(CN)2O)
Mercury cyanide oxide (Hg2(CN)2O) is a chemical substance with the molecular formula C2Hg2N2O.
01 · Identification
What Mercury cyanide oxide… is
Mercury cyanide oxide (Hg2(CN)2O) is a chemical substance with the molecular formula C2Hg2N2O. Its molecular formula is C2Hg2N2O and its molecular weight is 469.22 g/mol.
Under the GHS it carries the signal word Danger.
02 · Identifiers
Mercury cyanide oxide… identifiers and molecular data
Mercury cyanide oxide… CAS number and EC number
Mercury cyanide oxide… molecular formula and molecular weight
Other names for Mercury cyanide oxide…
- dimercury dicyanide oxide
- mercuric oxycyanide
03 · GHS classification
Mercury cyanide oxide… hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
Mercury cyanide oxide… pictograms and signal word
Mercury cyanide oxide… hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Explosives GHS chapter 2.1 | Category 1.1 | H201 | GHS01 |
| Acute toxicity - oral GHS chapter 3.1 | Category 3 | H301 | GHS06 |
| Acute toxicity - dermal GHS chapter 3.1 | Category 3 | H311 | GHS06 |
| Acute toxicity - inhalation GHS chapter 3.1 | Category 3 | H331 | GHS06 |
| Specific target organ toxicity - repeated exposure GHS chapter 3.9 | Category 2 | H373 | GHS08 |
| Hazardous to the aquatic environment - acute GHS chapter 4.1 | Category 1 | H400 | GHS09 |
| Hazardous to the aquatic environment - chronic GHS chapter 4.1 | Category 1 | H410 | GHS09 |
Mercury cyanide oxide… hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H201 | Explosive; mass explosion hazard. |
| H331 | Toxic if inhaled. |
| H311 | Toxic in contact with skin. |
| H301 | Toxic if swallowed. |
| H373 | May cause damage to organs <or state all organs affected, if known> through prolonged or repeated exposure <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
This page lists only the codes assigned to Mercury cyanide oxide…. The full reference lives on the hazard statements hub, the precautionary statements hub and the GHS pictograms hub.
Safety Data Sheet
Getting an SDS for Mercury cyanide oxide…
A Safety Data Sheet is written for a product, not for a substance: the supplier of the grade you actually buy issues it, so two suppliers of Mercury cyanide oxide… issue two different sheets. That is why there is no single authoritative SDS for a substance to download — what there is, is the job of collecting the sheets for the products you hold and keeping them current as suppliers revise them.
04 · Precautionary statements
Mercury cyanide oxide… precautionary statements
CLP Annex VI assigns 15 precautionary statements to Mercury cyanide oxide…. They are grouped the way a label groups them: what to do before handling, what to do when something has already happened, how to store it and how to dispose of it.
Prevention
What to do before and during handling so the hazard never happens.
Response
What to do once exposure, spillage or fire has already happened.
Disposal
What has to happen to the contents and the empty container.
Reading the notation. … is a blank the supplier fills in — not a truncated sentence.· [square brackets] mark a part printed only when it applies.
05 · Names in the regulation
Mercury cyanide oxide… name in 23 EU languages
CLP Annex VI Part 3 is published in every language edition of the regulation, and the identification column is written out in each of them. Nothing below is translated by us: each line is the name as that edition prints it. Under Art. 18(2) the substance name from Annex VI is a lawful product identifier, so this is the wording to put on a label going to that market — and where the cell lists several designations, any one of them qualifies.
| Language | Name in CLP Annex VI Part 3 |
|---|---|
| Bulgarian български | диживачен оксид дицианид живачен оксицианид |
| Spanish español | Óxido de dicianuro de dimercurio oxicianuro mercúrico |
| Czech čeština | oxydikyanid rtuťnatý oxykyanid rtuťnatý |
| Danish dansk | dikviksølvdicyanidoxid kviksølvoxycyanid |
| German Deutsch | Diquecksilberdicyanidoxid Quecksilberoxycyanid |
| Estonian eesti | dielavhõbeditsüaniidoksiid elavhõbe(II)oksütsüaniid |
| Greek ελληνικά | οξείδιο του δικυανιούχου διυδραργύρου οξυκυανιούχος υδράργυρος |
| English English | dimercury dicyanide oxide mercuric oxycyanide |
| French français | oxydicyanure de dimercure oxycyanure mercurique |
| Croatian hrvatski | diživin dicijanid oksid živin oksicijanid |
| Italian italiano | ossodicianuro di dimercurio ossicianuro di mercurio |
| Latvian latviešu | dzīvsudraba dicianīda oksīds dzīvsudraba(II) oksicianīds |
| Lithuanian lietuvių | digyvsidabrio dicianido oksidas gyvsidabrio oksicianidas |
| Hungarian magyar | dihigany-dicianid-oxid higany-oxicianid |
| Maltese Malti | ossidu tad-diċjanur tad-dimerkurju ossiċjanur merkuriku |
| Dutch Nederlands | dikwikdicyanideoxide kwikoxycyanide |
| Polish polski | dicyjank tlenek dirtęci(II) dicyjanek tlenek dirtęcitlenocyjanek rtęci |
| Portuguese português | oxidicianeto de dimercúrio oxicianeto mercúrico |
| Romanian română | oxidicianură de dimercur oxicianură mercurică |
| Slovak slovenčina | dikyanid-oxid ortuťnatý hydrargýrium-dikyanid-oxid |
| Slovenian slovenščina | diživosrebrov dicianid oksid živosrebrov oksicianid |
| Finnish suomi | dielohopeadisyanidioksidi elohopeaoksisyanidi |
| Swedish svenska | dikvicksilverdicyanidoxid kvicksilveroxicyanid |
All 23 language editions of Annex VI carry this entry. Irish is the twenty-fourth official EU language and has no line here for a different reason: no consolidated CLP text has ever been published in Irish, so there is no Irish edition of Annex VI to quote a name from. Source: consolidated CLP, CELEX 02008R1272, language editions. © European Union, https://eur-lex.europa.eu — only the electronic Official Journal of the European Union is authentic.
06 · Label elements
Mercury cyanide oxide… GHS label elements
Everything CLP Annex VI fixes for Mercury cyanide oxide…, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Danger
Mercury cyanide oxide…
- Explosive; mass explosion hazard.
- Toxic if inhaled.
- Toxic in contact with skin.
- Toxic if swallowed.
- May cause damage to organs <or state all organs affected, if known> through prolonged or repeated exposure <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>.
- Very toxic to aquatic life.
- Very toxic to aquatic life with long lasting effects.
- Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
- Do not breathe dust/fume/gas/mist/vapours/spray.
- Do not eat, drink or smoke when using this product.
- Use only outdoors or in a well-ventilated area.
- Avoid release to the environment.
- Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/…
- IF SWALLOWED:
- IF ON SKIN:
- IF INHALED:
- Immediately call a POISON CENTER/doctor/…
- Get medical advice/attention if you feel unwell.
- Rinse mouth.
- Wash with plenty of water/…
- Collect spillage.
- Dispose of contents/container to …
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open Mercury cyanide oxide… in the GHS label constructor →
07 · Health hazards
Mercury cyanide oxide… health hazards and exposure limits
Mercury cyanide oxide… hazard summary
Toxic by inhalation, skin exposure, and ingestion; [ESIS] Detonates on heating, dangerous explosion risk; [Hawley] See Mercury, inorganic compounds and the linked occupational disease. See CYANIDES.
Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Mercury cyanide oxide… occupational exposure limits
| Limit | Value | Source |
|---|---|---|
| PEL | 0.1 [mg/m3], as Hg (5 mg/m3, as CN) | Haz-Map, Information on Hazardous Chemicals and Occupational Diseases |
| IDLH | 10 mg Hg/m3 (NIOSH, 2024) | CAMEO Chemicals |
| IDLH | 10.0 [mg/m3], as Hg | Haz-Map, Information on Hazardous Chemicals and Occupational Diseases |
These are United States values. The European Union sets its own indicative and binding limits, and the figure that applies at a given workplace is the one in the local regulation — not the one shown here.
08 · Handling and storage
Mercury cyanide oxide… storage and handling
Mercury cyanide oxide… reactivity
MERCURIC OXYCYANIDE detonates on heating [Hawley]. Several instances have been reported where explosions occurred in handling this substance. Friction is a frequent cause of the explosion [Chem. Abst. 16:2010. 1972]. Decomposes on contact with acid to give off hydrogen cyanide, a flammable poisonous gas. Desensitized by mixing 67% mercuric cyanide to create commercial product.
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Mercury cyanide oxide… in the storage compatibility matrix →
09 · Questions
Mercury cyanide oxide… — frequently asked questions
What is the CAS number of Mercury cyanide oxide…?
The CAS number of Mercury cyanide oxide… is 1335-31-5. Its EC number is 215-629-8.
What is the chemical formula of Mercury cyanide oxide…?
The molecular formula of Mercury cyanide oxide… is C2Hg2N2O and its molecular weight is 469.22 g/mol.
What does a Mercury cyanide oxide… label have to show?
Under CLP Annex VI the label for Mercury cyanide oxide… carries the pictograms Exploding bomb, Skull and crossbones, Health hazard and Environment and the signal word is Danger.
Is Mercury cyanide oxide… flammable?
CLP Annex VI assigns Mercury cyanide oxide… no flammability hazard class. That is not a statement that it cannot burn: the harmonised list only records the hazards that were assessed for it.
Is Mercury cyanide oxide… a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for Mercury cyanide oxide…. Annex VI is a list of agreed classifications, not a list of substances found safe, so this is an absence of a classification rather than a clean bill of health.
What is the exposure limit for Mercury cyanide oxide…?
The US occupational exposure limit reported for Mercury cyanide oxide… is 0.1 [mg/m3], as Hg (5 mg/m3, as CN) (Haz-Map, Information on Hazardous Chemicals and Occupational Diseases). Limits differ by country: the EU sets its own indicative and binding values, and the figure that applies at a given workplace is the one in the local regulation.
Nearby
Substances next to Mercury cyanide oxide…
Keep going: substances starting with M, or search the whole database by name, CAS number, pictogram or signal word.