Substance profile
Hexachlorocyclopentadiene
Hexachlorocyclopentadiene is a dense, oily liquid with a pungent, unpleasant odor.
01 · Identification
What Hexachlorocyclopentadiene is
Hexachlorocyclopentadiene is a dense, oily liquid with a pungent, unpleasant odor. Its molecular formula is C5Cl6 and its molecular weight is 272.8 g/mol. It boils at 239 °C, melts at -9 °C.
Under the GHS it carries the signal word Danger. It is classed as hazardous Air Pollutants (HAPs).
02 · Identifiers
Hexachlorocyclopentadiene identifiers and molecular data
Hexachlorocyclopentadiene CAS number and EC number
Hexachlorocyclopentadiene molecular formula and molecular weight
03 · GHS classification
Hexachlorocyclopentadiene hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
Hexachlorocyclopentadiene pictograms and signal word
Hexachlorocyclopentadiene 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 3 | H311 | GHS06 |
| Acute toxicity - inhalation GHS chapter 3.1 | Category 1 or 2 | H330 | GHS06 |
| Skin corrosion/irritation GHS chapter 3.2 | Category 1A or 1B or 1C | H314 | GHS05 |
| 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 |
Where two values are shown with “or”, the hazard statement is shared by more than one category or by more than one class, and the code alone does not say which. H272, for example, belongs to oxidising liquids and to oxidising solids — the physical state decides. The binding answer for a specific entry is in the CLP Annex VI table itself.
Hexachlorocyclopentadiene hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H330 | Fatal if inhaled. |
| H311 | Toxic in contact with skin. |
| H302 | Harmful if swallowed. |
| H314 | Causes severe skin burns and eye damage. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
This page lists only the codes assigned to Hexachlorocyclopentadiene. 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 Hexachlorocyclopentadiene
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 Hexachlorocyclopentadi… 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
Hexachlorocyclopentadiene precautionary statements
CLP Annex VI assigns 15 precautionary statements to Hexachlorocyclopentadiene. 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
Hexachlorocyclopentadiene 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 | хексахлороциклопентадиен |
| Spanish español | Hexaclorociclopentadieno |
| Czech čeština | hexachlorcyklopenta-1,3-dien |
| Danish dansk | hexachlorcyclopentadien |
| German Deutsch | Hexachlorcyclopentadien |
| Estonian eesti | heksaklorotsüklopentadieen |
| Greek ελληνικά | εξαχλωροκυκλοπενταδιένιο |
| English English | hexachlorocyclopentadiene |
| French français | hexachlorocyclopentadiène |
| Croatian hrvatski | heksaklorciklopentadien |
| Italian italiano | esaclorociclopentadiene |
| Latvian latviešu | heksahlorciklopentadiēns |
| Lithuanian lietuvių | heksachlorciklopentadienas |
| Hungarian magyar | hexaklórciklopentadién |
| Maltese Malti | eżakloroċiklopentadjen |
| Dutch Nederlands | hexachloorcyclopentadieen |
| Polish polski | heksachlorocyklopentadien |
| Portuguese português | hexaclorociclopentadieno |
| Romanian română | hexaclorociclopentadienă |
| Slovak slovenčina | hexachlórcyklopentadién |
| Slovenian slovenščina | heksaklorociklopentadien |
| Finnish suomi | heksakloorisyklopentadieeni |
| Swedish svenska | hexaklorcyklopentadien |
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
Hexachlorocyclopentadiene GHS label elements
Everything CLP Annex VI fixes for Hexachlorocyclopentadiene, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Danger
Hexachlorocyclopentadiene
- Fatal if inhaled.
- Toxic in contact with skin.
- Harmful if swallowed.
- Causes severe skin burns and eye damage.
- Very toxic to aquatic life.
- Very toxic to aquatic life with long lasting effects.
- 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/…
- Call a POISON CENTER/doctor/… if you feel unwell.
- Rinse mouth.
- Do NOT induce vomiting.
- 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 Hexachlorocyclopentadiene in the GHS label constructor →
07 · Health hazards
Hexachlorocyclopentadiene health hazards and exposure limits
Hexachlorocyclopentadiene hazard summary
HCCPD is a manufactured chemical that does not occur naturally. It is a light, lemon-yellow liquid that has a sharp musty odor. It easily evaporates into the air; the vapor looks like a blue haze. HCCPD is used in the manufacture of certain pesticides. Most of the HCCPD in the environment results from releases during its production and disposal. It is also used to make flame retardants, resins that won't burn, shock-proof plastics, esters, ketones, fluorocarbons, and dyes.
Source: Agency for Toxic Substances and Disease Registry (ATSDR)
Hexachlorocyclopentadiene carcinogenicity classification
Under the conditions of these 2-year studies, there was no evidence of carcinogenic activity of hexachlorocyclopentadiene in male or female F344/N rats or B6C3F1 mice exposed to 0.01, 0.05, or 0.2 ppm.
Source: US National Toxicology Program · TR-437: Toxicology and Carcinogenesis Studies of Hexachlorocyclopentadiene (CASRN 77-47-4) in F344/N Rats and B6C3F1 Mice (Inhalation Studies) (1994 )
Cancer Classification: Group D Not Classifiable as to Human Carcinogenicity
Source: Hazardous Substances Data Bank (HSDB)
CLASSIFICATION: D; not classifiable as to human carcinogenicity. BASIS FOR CLASSIFICATION: Inadequate data in humans and no data in animals concerning carcinogenicity of hexachlorocyclopentadiene. HUMAN CARCINOGENICITY DATA: Inadequate.
Source: Hazardous Substances Data Bank (HSDB)
An IARC group and a CLP classification answer different questions. IARC judges whether the evidence for cancer in humans is strong enough; CLP Annex VI is the legally binding EU classification. A substance can carry one and not the other.
Hexachlorocyclopentadiene occupational exposure limits
| Limit | Value | Source |
|---|---|---|
| PEL | none See Appendix G | The National Institute for Occupational Safety and Health (NIOSH) |
| REL | 0.01 ppm (0.1 mg/m³) | Occupational Safety and Health Administration (OSHA) |
| REL | TWA 0.01 ppm (0.1 mg/m3) | The National Institute for Occupational Safety and Health (NIOSH) |
| IDLH | N.D. | The National Institute for Occupational Safety and Health (NIOSH) |
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 · Physical and chemical properties
Hexachlorocyclopentadiene 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.
Hexachlorocyclopentadiene boiling point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 239 °C (462.2 °F) | HSDB | |
| 238.89 °C (462 °F) | NIOSH | ||
| 238.89 °C (462 °F) | at 753 mmHg | CAMEO |
Hexachlorocyclopentadiene melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | -9 °C (15.8 °F) | HSDB | |
| -8.89 °C (16 °F) | NIOSH |
Hexachlorocyclopentadiene density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 1.71 g/cm³ | NIOSH | |
| 1.7019 g/cm³ | at 25 °C | HSDB |
Hexachlorocyclopentadiene solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| Solubility | Soluble in all proportions in acetone, carbon tetrachloride, methanol and hexane. | HSDB | |
| In water, 1.8 mg/L at 25 °C | at 25 °C | HSDB | |
| (77 °F): 0.0002% (Reacts) | at 25 °C | NIOSH |
Hexachlorocyclopentadiene vapor pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor pressure | 0.06 mmHg | at 25 °C, Extrapolated | HSDB |
| 0.08 mmHg | at 25 °C | NIOSH |
Hexachlorocyclopentadiene flash point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Flash point | Non-flammable (EPA, 1998) | CAMEO |
Hexachlorocyclopentadiene lower explosive limit (LEL)
| Property | Value | Conditions | Source |
|---|---|---|---|
| Lower explosive limit (LEL) | In presence of moisture explosive hydrogen gas may collect in enclosed space. | HSDB | |
| Noncombustible Liquid | NIOSH |
Hexachlorocyclopentadiene vapor density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor density | 9.4 (air = 1) | HSDB |
Hexachlorocyclopentadiene odor threshold
| Property | Value | Conditions | Source |
|---|---|---|---|
| Odor threshold | 0.15 ppm or 1.7 mg/cu m | HSDB | |
| Odor low: 1.5 mg/cu m; Odor high: 3.3 mg/cu m | HSDB | ||
| Odor Threshold Low: 0.15 [ppm] | Haz-Map |
Hexachlorocyclopentadiene corrosivity
| Property | Value | Conditions | Source |
|---|---|---|---|
| Corrosivity | In presence of moisture, will corrode iron & other metals. | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Fire and explosion
Hexachlorocyclopentadiene fire and explosion behaviour
These are descriptions rather than measured values, so they are kept out of the table above and quoted here with the source that reported them.
Hexachlorocyclopentadiene fire potential
Nonflammable
Source: Hazardous Substances Data Bank (HSDB)
10 · Handling and storage
Hexachlorocyclopentadiene storage and handling
Hexachlorocyclopentadiene safe storage
Store in an area without drain or sewer access. Dry. Well closed. Ventilation along the floor.
Source: ILO-WHO International Chemical Safety Cards (ICSCs)
Hexachlorocyclopentadiene incompatible materials
Reacts slowly with water to form hydrochloric acid.
Source: Hazardous Substances Data Bank (HSDB)
Hexachlorocyclopentadiene reactivity
HEXACHLOROCYCLOPENTADIENE is incompatible with strong oxidizing and reducing agents. Also incompatible with many amines, nitrides, azo/diazo compounds, alkali metals (sodium), and epoxides.
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Hexachlorocyclopentadiene in the storage compatibility matrix →
11 · Questions
Hexachlorocyclopentadiene — frequently asked questions
What is the CAS number of Hexachlorocyclopentadiene?
The CAS number of Hexachlorocyclopentadiene is 77-47-4. Its EC number is 201-029-3.
What is the chemical formula of Hexachlorocyclopentadiene?
The molecular formula of Hexachlorocyclopentadiene is C5Cl6 and its molecular weight is 272.8 g/mol.
What does a Hexachlorocyclopentadiene label have to show?
Under CLP Annex VI the label for Hexachlorocyclopentadiene carries the pictograms Skull and crossbones, Corrosion and Environment and the signal word is Danger.
Is Hexachlorocyclopentadiene flammable?
CLP Annex VI assigns Hexachlorocyclopentadiene 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. The flash point reported for it is Non-flammable (EPA, 1998) (CAMEO).
Is Hexachlorocyclopentadiene a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for Hexachlorocyclopentadiene. 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 Hexachlorocyclopentadiene?
The US occupational exposure limit reported for Hexachlorocyclopentadiene is none See Appendix G (The National Institute for Occupational Safety and Health (NIOSH)). 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.
What is the boiling point of Hexachlorocyclopentadiene?
The boiling point reported for Hexachlorocyclopentadiene is 239 °C (462.2 °F) (HSDB).
What is the melting point of Hexachlorocyclopentadiene?
The melting point reported for Hexachlorocyclopentadiene is -9 °C (15.8 °F) (HSDB).
Nearby
Substances next to Hexachlorocyclopentadiene
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