Substance profile
Thiocyanic Acid
Thiocyanic Acid: colourless liquid.
01 · Identification
What Thiocyanic Acid is
Thiocyanic Acid: colourless liquid. Its molecular formula is CHNS and its molecular weight is 59.09 g/mol. It melts at 5 °C.
Under the GHS it carries the signal word Warning.
02 · Identifiers
Thiocyanic Acid identifiers and molecular data
Thiocyanic Acid CAS number and EC number
Thiocyanic Acid molecular formula and molecular weight
03 · GHS classification
Thiocyanic Acid hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
Thiocyanic Acid pictograms and signal word
Thiocyanic Acid hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Acute toxicity - oral GHS chapter 3.1 | Category 4 | H302 | GHS07 |
| Acute toxicity - dermal GHS chapter 3.1 | Category 4 | H312 | GHS07 |
| Acute toxicity - inhalation GHS chapter 3.1 | Category 4 | H332 | GHS07 |
| Hazardous to the aquatic environment - chronic GHS chapter 4.1 | Category 3 | H412 | — |
Thiocyanic Acid hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H332 | Harmful if inhaled. |
| H312 | Harmful in contact with skin. |
| H302 | Harmful if swallowed. |
| H412 | Harmful to aquatic life with long lasting effects. |
Thiocyanic Acid supplemental EU statements (EUH)
| Code | Statement |
|---|---|
| EUH032 | Contact with acids liberates very toxic gas. |
This page lists only the codes assigned to Thiocyanic Acid. 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 Thiocyanic Acid
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 Thiocyanic Acid 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
Thiocyanic Acid precautionary statements
CLP Annex VI assigns 12 precautionary statements to Thiocyanic Acid. 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
Thiocyanic Acid 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 | тиоцианова киселина |
| Spanish español | Ácido tiociánico |
| Czech čeština | thiokyanatá kyselina |
| Danish dansk | thiocyansyre |
| German Deutsch | Thiocyansäure Rhodanwasserstoffsäure |
| Estonian eesti | tiotsüaanhape |
| Greek ελληνικά | θειοκυανικό οξύ |
| English English | thiocyanic acid |
| French français | acide thiocyanique |
| Croatian hrvatski | tiocijanska kiselina |
| Italian italiano | acido tiocianico |
| Latvian latviešu | tiociānskābe |
| Lithuanian lietuvių | tiocianato rūgštis |
| Hungarian magyar | tiociánsav |
| Maltese Malti | aċidu tijoċjaniku |
| Dutch Nederlands | thiocyaanzuur |
| Polish polski | kwas tiocyjanowy kwas rodanowodorowy |
| Portuguese português | ácido tiociânico |
| Romanian română | acid tiocianic |
| Slovak slovenčina | kyselina tiokyanatá |
| Slovenian slovenščina | tiocianska kislina |
| Finnish suomi | tiosyaanihappo |
| Swedish svenska | tiocyansyra |
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
Thiocyanic Acid GHS label elements
Everything CLP Annex VI fixes for Thiocyanic Acid, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Warning
Thiocyanic Acid
- Harmful if inhaled.
- Harmful in contact with skin.
- Harmful if swallowed.
- Harmful to aquatic life with long lasting effects.
- Contact with acids liberates very toxic gas.
- 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:
- Call a POISON CENTER/doctor/… if you feel unwell.
- Rinse mouth.
- Wash with plenty of water/…
- Dispose of contents/container to …
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open Thiocyanic Acid in the GHS label constructor →
07 · Health hazards
Thiocyanic Acid health hazards and exposure limits
Thiocyanic Acid hazard summary
A very strong acid; [Merck Index] Polymerizes on warming; Chronic exposure may cause hypothyroidism; [ICSC] See Sodium thiocyanate.
Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
08 · Physical and chemical properties
Thiocyanic Acid properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
Thiocyanic Acid melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | 5 °C (41 °F) | ICSC |
Thiocyanic Acid solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| Solubility | Solubility in water: good | ICSC |
Thiocyanic Acid vapor pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor pressure | 4.73 mmHg | Haz-Map |
Thiocyanic Acid vapor density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor density | 2 (air = 1) | ICSC |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Handling and storage
Thiocyanic Acid storage and handling
Thiocyanic Acid safe storage
Separated from strong oxidants, strong bases and food and feedstuffs. Ventilation along the floor.
Source: ILO-WHO International Chemical Safety Cards (ICSCs)
Planning storage for a mix of chemicals? Check Thiocyanic Acid in the storage compatibility matrix →
10 · Questions
Thiocyanic Acid — frequently asked questions
What is the CAS number of Thiocyanic Acid?
The CAS number of Thiocyanic Acid is 463-56-9. Its EC number is 207-337-4.
What is the chemical formula of Thiocyanic Acid?
The molecular formula of Thiocyanic Acid is CHNS and its molecular weight is 59.09 g/mol.
What does a Thiocyanic Acid label have to show?
Under CLP Annex VI the label for Thiocyanic Acid carries the pictogram Exclamation mark and the signal word is Warning.
Is Thiocyanic Acid flammable?
CLP Annex VI assigns Thiocyanic Acid 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 Thiocyanic Acid a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for Thiocyanic Acid. 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 melting point of Thiocyanic Acid?
The melting point reported for Thiocyanic Acid is 5 °C (41 °F) (ICSC).
Nearby
Substances next to Thiocyanic Acid
Keep going: substances starting with T, or search the whole database by name, CAS number, pictogram or signal word.