Substance profile
3-Chloro-2-methyl-1-propene
3-Chloro-2-methyl-1-propene is a colorless to straw-colored liquid with a sharp, penetrating odor.
01 · Identification
What 3-Chloro-2-methyl-1-propene is
3-Chloro-2-methyl-1-propene is a colorless to straw-colored liquid with a sharp, penetrating odor. It boils at 72 °C, melts at -80 °C.
Under the GHS it carries the signal word Danger. It is classed as flammable agents - 3rd degree.
02 · Identifiers
3-Chloro-2-methyl-1-propene identifiers and molecular data
3-Chloro-2-methyl-1-propene CAS number and EC number
3-Chloro-2-methyl-1-propene molecular formula and molecular weight
Other names for 3-Chloro-2-methyl-1-propene
- 3-chloro-2-methylpropene
03 · GHS classification
3-Chloro-2-methyl-1-propene hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
3-Chloro-2-methyl-1-propene pictograms and signal word
3-Chloro-2-methyl-1-propene hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Flammable liquids GHS chapter 2.6 | Category 2 | H225 | GHS02 |
| Acute toxicity - oral GHS chapter 3.1 | Category 4 | H302 | GHS07 |
| Acute toxicity - inhalation GHS chapter 3.1 | Category 4 | H332 | GHS07 |
| Skin corrosion/irritation GHS chapter 3.2 | Category 1A or 1B or 1C | H314 | GHS05 |
| Skin sensitisation GHS chapter 3.4 | Category 1 or 1A or 1B | H317 | GHS07 |
| Hazardous to the aquatic environment - chronic GHS chapter 4.1 | Category 2 | H411 | 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.
3-Chloro-2-methyl-1-propene hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H225 | Highly flammable liquid and vapour. |
| H332 | Harmful if inhaled. |
| H302 | Harmful if swallowed. |
| H314 | Causes severe skin burns and eye damage. |
| H317 | May cause an allergic skin reaction. |
| H411 | Toxic to aquatic life with long lasting effects. |
This page lists only the codes assigned to 3-Chloro-2-methyl-1-propen…. 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 3-Chloro-2-methyl-1-propen…
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 3-Chloro-2-methyl-1-pr… 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
3-Chloro-2-methyl-1-propene precautionary statements
CLP Annex VI assigns 22 precautionary statements to 3-Chloro-2-methyl-1-propen…. 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
3-Chloro-2-methyl-1-propene 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 | 2-метил-3-хлоропропен |
| Spanish español | 3-Cloro-2-metilpropeno |
| Czech čeština | 3-chlor-2-methylpropen |
| Danish dansk | 3-chlor-2-methylpropen |
| German Deutsch | 3-Chlor-2-methylpropen Methallylchlorid2-Methylallylchlorid |
| Estonian eesti | 3-kloro-2-metüülpropeen |
| Greek ελληνικά | 3-χλωρο-2-μεθυλοπροπένιο |
| English English | 3-chloro-2-methylpropene |
| French français | 3-chloro-2-méthylpropène |
| Croatian hrvatski | 3-klor-2-metilpropen |
| Italian italiano | 3-cloro-2-metilpropene |
| Latvian latviešu | 3-hlor-2-metilpropēns |
| Lithuanian lietuvių | 3-chlor-2-metilpropenas |
| Hungarian magyar | 3-klór-2-metilpropén |
| Maltese Malti | 3-kloro-2-metilpropen |
| Dutch Nederlands | 3-chloor-2-methylpropeen |
| Polish polski | 3-chloro-2-metylopropen chlorek 2-metyloallilu |
| Portuguese português | 3-cloro-2-metilpropeno |
| Romanian română | 3-cloro-2-metilpropenă |
| Slovak slovenčina | 3-chlór-2-metylpropén |
| Slovenian slovenščina | 3-kloro-2-metilpropen |
| Finnish suomi | 3-kloori-2-metyylipropeeni metallyylikloridi |
| Swedish svenska | 3-klor-2-metylpropen |
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
3-Chloro-2-methyl-1-propene GHS label elements
Everything CLP Annex VI fixes for 3-Chloro-2-methyl-1-propen…, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Danger
3-Chloro-2-methyl-1-propene
- Highly flammable liquid and vapour.
- Harmful if inhaled.
- Harmful if swallowed.
- Causes severe skin burns and eye damage.
- May cause an allergic skin reaction.
- Toxic to aquatic life with long lasting effects.
- Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
- Keep container tightly closed.
- Use explosion-proof [electrical/ventilating/lighting/…] equipment.
- Use only non-sparking tools.
- Do not breathe dust/fume/gas/mist/vapours/spray.
- Avoid breathing 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.
- Contaminated work clothing should not be allowed out of the workplace.
- Avoid release to the environment.
- Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/…
- IF SWALLOWED:
- IF INHALED:
- Immediately call a POISON CENTER/doctor/…
- Call a POISON CENTER/doctor/… if you feel unwell.
- Get medical advice/attention.
- Rinse mouth.
- Do NOT induce vomiting.
- If skin irritation or rash occurs:
- Collect spillage.
- Store in a well-ventilated place.
- Dispose of contents/container to …
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open 3-Chloro-2-methyl-1-propen… in the GHS label constructor →
07 · Health hazards
3-Chloro-2-methyl-1-propene health hazards and exposure limits
3-Chloro-2-methyl-1-propene hazard summary
A skin, eye, and respiratory tract irritant; Tear drawing; Inhalation of high concentrations may cause CNS effects; May cause skin sensitization; [ICSC] Dangerous fire risk; Explosive limits in air are 3.2 - 8.1%; [Hawley] Harmful by inhalation and ingestion; Causes burns; Lachrymatory effect; May cause skin sensitization; [MSDSonline] See Carcinogenicity of some industrial chemicals, Volume 115. [IARC, News Release, 23 February 2016] Methylallyl chloride (UN2554) has warning of explosive polymerization; [ERG 2016]
Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
3-Chloro-2-methyl-1-propene carcinogenicity classification
Under the conditions of these 2-year gavage studies, there was clear evidence of carcinogenicity for 3-chloro-2-methylpropene as shown by the increased incidences of squamous cell neoplasms in the forestomach of male and female F344/N rats and of male and female B6C3F1 mice.
Source: US National Toxicology Program · TR-300: Toxicology and Carcinogenesis Studies of 3-Chloro-2-methylpropene (Technical grade containing 5% Dimethylvinyl chloride) (CASRN 563-47-3) in F344/N Rats and B6C3F1 Mice (Gavage Studies) (1986 )
Evaluation: There is inadequate evidence in humans for the carcinogenicity of 3-chloro-2-methylpropene. There is limited evidence in experimental animals for the carcinogenicity of 3-chloro-2-methylchloropropene. Overall evaluation: 3-Chloro-2-methylpropene is not classifiable as to its carcinogenicity to humans (Group 3).
Source: Hazardous Substances Data Bank (HSDB)
3-Chloro-2-methyl-1-propene: reasonably anticipated to be a human carcinogen.
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.
08 · Physical and chemical properties
3-Chloro-2-methyl-1-propene 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.
3-Chloro-2-methyl-1-propene boiling point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 72 °C (161.6 °F) | ICSC | |
| 72.17 °C (161.9 °F) | at 760 mmHg | DOE PAC | |
| 71.5 °C (160.7 °F) | range, midpoint shown | HSDB |
3-Chloro-2-methyl-1-propene melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | -80 °C (-112 °F) | ICSC | |
| -80 °C (-112 °F) | below this value | HSDB |
3-Chloro-2-methyl-1-propene density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 0.92 g/cm³ | ICSC | |
| 0.928 g/cm³ | at 20 °C | CAMEO | |
| 0.9257 g/cm³ | at 20 °C | DOE PAC |
3-Chloro-2-methyl-1-propene solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| Solubility | Miscible in alcohol and ether, very soluble in chloroform, and soluble in acetone. | HSDB | |
| Solubility in water at 20 °C is ca. 0.05 wt%; water solubility in methylallyl chloride is 0.04 wt%. | at 20 °C | HSDB | |
| 1400 mg/l in water at 25 °C. | at 25 °C | HSDB |
3-Chloro-2-methyl-1-propene vapor pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor pressure | 101.7 mmHg | at 20 °C | HSDB |
| 105.009 mmHg | at 20 °C | ICSC |
3-Chloro-2-methyl-1-propene flash point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Flash point | -19.44 °C (-3 °F) | HSDB | |
| 33.33 °C (92 °F) | HSDB | ||
| -12.78 °C (9 °F) | CAMEO |
3-Chloro-2-methyl-1-propene autoignition temperature
| Property | Value | Conditions | Source |
|---|---|---|---|
| Autoignition temperature | 540 °C (1004 °F) | ICSC |
3-Chloro-2-methyl-1-propene lower explosive limit (LEL)
| Property | Value | Conditions | Source |
|---|---|---|---|
| Lower explosive limit (LEL) | 2.3 % by volume | CAMEO | |
| 2.2 % by volume | ICSC | ||
| 3.2 % by volume | DOE PAC |
3-Chloro-2-methyl-1-propene upper explosive limit (UEL)
| Property | Value | Conditions | Source |
|---|---|---|---|
| Upper explosive limit (UEL) | 9.3 % by volume | CAMEO | |
| 10.4 % by volume | ICSC |
3-Chloro-2-methyl-1-propene vapor density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor density | 3.1 (air = 1) | HSDB | |
| 3.12 (air = 1) | CAMEO |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Fire and explosion
3-Chloro-2-methyl-1-propen… 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.
3-Chloro-2-methyl-1-propene fire potential
FLAMMABLE, DANGEROUS FIRE RISK.
Source: Hazardous Substances Data Bank (HSDB)
10 · Handling and storage
3-Chloro-2-methyl-1-propene storage and handling
3-Chloro-2-methyl-1-propene safe storage
Fireproof. Separated from strong oxidants and strong bases. Cooled. Well closed. Ventilation along the floor. Store in an area without drain or sewer access.
Source: ILO-WHO International Chemical Safety Cards (ICSCs)
3-Chloro-2-methyl-1-propene reactivity
METHYLALLYL CHLORIDE is sensitive to light. This chemical can react vigorously with oxidizers. It is incompatible with strong bases. It may react with water at elevated temperatures. (NTP, 1992).
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check 3-Chloro-2-methyl-1-prope… in the storage compatibility matrix →
11 · Questions
3-Chloro-2-methyl-1-propene — frequently asked questions
What is the CAS number of 3-Chloro-2-methyl-1-propene?
The CAS number of 3-Chloro-2-methyl-1-propene is 563-47-3. Its EC number is 209-251-2.
What does a 3-Chloro-2-methyl-1-propene label have to show?
Under CLP Annex VI the label for 3-Chloro-2-methyl-1-propene carries the pictograms Flame, Corrosion, Exclamation mark and Environment and the signal word is Danger.
Is 3-Chloro-2-methyl-1-propene flammable?
Yes. CLP Annex VI assigns 3-Chloro-2-methyl-1-propene H225 — highly flammable liquid and vapour. The flash point reported for it is -19.44 °C (-3 °F) (HSDB).
Is 3-Chloro-2-methyl-1-propene a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for 3-Chloro-2-methyl-1-propene. 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. IARC places it in Group 2B: possibly carcinogenic to humans.
What is the boiling point of 3-Chloro-2-methyl-1-propene?
The boiling point reported for 3-Chloro-2-methyl-1-propene is 72 °C (161.6 °F) (ICSC).
What is the melting point of 3-Chloro-2-methyl-1-propene?
The melting point reported for 3-Chloro-2-methyl-1-propene is -80 °C (-112 °F) (ICSC).
How should 3-Chloro-2-methyl-1-propene be stored?
CLP Annex VI assigns 3-Chloro-2-methyl-1-propene the storage statement P403.
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