Substance profile
1,4-Dichloro-2-butene
1,4-Dichloro-2-butene is a colorless liquid with a sweet, pungent odor.
01 · Identification
What 1,4-Dichloro-2-butene is
1,4-Dichloro-2-butene is a colorless liquid with a sweet, pungent odor. Its molecular formula is C4H6Cl2 and its molecular weight is 124.99 g/mol. It boils at 158 °C, melts at 3.5 °C, is soluble in water.
Under the GHS it carries the signal word Danger.
02 · Identifiers
1,4-Dichloro-2-butene identifiers and molecular data
1,4-Dichloro-2-butene CAS number and EC number
1,4-Dichloro-2-butene molecular formula and molecular weight
Other names for 1,4-Dichloro-2-butene
- 1,4-dichlorobut-2-ene
03 · GHS classification
1,4-Dichloro-2-butene hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
1,4-Dichloro-2-butene pictograms and signal word
1,4-Dichloro-2-butene hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| 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 1 or 2 | H330 | GHS06 |
| Skin corrosion/irritation GHS chapter 3.2 | Category 1A or 1B or 1C | H314 | GHS05 |
| Carcinogenicity GHS chapter 3.6 | Category 1A or 1B | H350 | 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 |
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.
1,4-Dichloro-2-butene hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H350 | May cause cancer <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>. |
| H330 | Fatal if inhaled. |
| H311 | Toxic in contact with skin. |
| H301 | Toxic 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 1,4-Dichloro-2-butene. 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 1,4-Dichloro-2-butene
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 1,4-Dichloro-2-butene 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
1,4-Dichloro-2-butene precautionary statements
CLP Annex VI assigns 17 precautionary statements to 1,4-Dichloro-2-butene. 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
1,4-Dichloro-2-butene 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 | 1,4-дихлоробут-2-ен |
| Spanish español | 1,4-Diclorobut-2-eno |
| Czech čeština | 1,4-dichlorbut-2-en |
| Danish dansk | 1,4-dichlorbut-2-en |
| German Deutsch | 1,4-Dichlorbut-2-en 1,4-Dichlorbuten-2 |
| Estonian eesti | 1,4-diklorobut-2-een |
| Greek ελληνικά | 1,4-διχλωροβουτ-2-ένιο |
| English English | 1,4-dichlorobut-2-ene |
| French français | 1,4-dichlorobut-2-ène |
| Croatian hrvatski | 1,4-diklorbut-2-en |
| Italian italiano | 1,4-diclorobut-2-ene |
| Latvian latviešu | 1,4-dihlorbut-2-ēns |
| Lithuanian lietuvių | 1,4-dichlorbut-2-enas |
| Hungarian magyar | 1,4-diklórbut-2-én |
| Maltese Malti | 1,4-diklorobut-2-en |
| Dutch Nederlands | 1,4-dichloorbut-2-een |
| Polish polski | 1,4-dichlorobut-2-en |
| Portuguese português | 1,4-diclorobut-2-eno |
| Romanian română | 1,4-diclorbut-2-enă |
| Slovak slovenčina | 1,4-dichlórbut-2-én |
| Slovenian slovenščina | 1,4-diklorobut-2-en |
| Finnish suomi | 1,4-diklooribut-2-eeni |
| Swedish svenska | 1,4-diklorbut-2-en |
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
1,4-Dichloro-2-butene GHS label elements
Everything CLP Annex VI fixes for 1,4-Dichloro-2-butene, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Danger
1,4-Dichloro-2-butene
- May cause cancer <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>.
- Fatal if inhaled.
- Toxic in contact with skin.
- Toxic if swallowed.
- Causes severe skin burns and eye damage.
- Very toxic to aquatic life.
- Very toxic to aquatic life with long lasting effects.
- Obtain special instructions before use.
- 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:
- IF exposed or concerned:
- Immediately call a POISON CENTER/doctor/…
- Get medical advice/attention.
- 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 1,4-Dichloro-2-butene in the GHS label constructor →
07 · Health hazards
1,4-Dichloro-2-butene health hazards and exposure limits
1,4-Dichloro-2-butene hazard summary
Highly toxic; [Quick CPC] When heated, decomposes to toxic gases: phosgene and HCl; High inhalation exposure can cause pulmonary edema; [HSDB] Skin contact with liquid causes severe blistering; [CHRIS] Induces genetic damage in germ cells of humans or animals (3A); [MAK] Reacts with water forming hydrochloric acid; Vapor is irritating to nose and throat; Highly irritating to skin (blistering) and eyes (lachrymation); [CAMEO] Generally available in the US as a mixture of 95-98% trans- (CAS# 110-57-6) and 2-5% cis- (CAS#1476-11-5) isomers; [OECD SIDS] Causes burns and lachrymation; Inhalation may cause corrosive injuries to upper respiratory tract and lungs; Highly toxic by inhalation; Toxic by ingestion and skin absorption; [Aldrich MSDS] See 1,4-Dichloro-trans-2-butene.
Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
1,4-Dichloro-2-butene carcinogenicity classification
Classification of carcinogenicity: evidence in animals: inadequate. No epidemiological data relevant to the carcinogenicity of trans-1,4-dichlorobutene were available. Overall summary evaluation of carcinogenic risk to humans is Group 3. The agent is not classifiable as to its carcinogenicity to humans.
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
1,4-Dichloro-2-butene 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.
1,4-Dichloro-2-butene boiling point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 158 °C (316.4 °F) | HSDB | |
| 156.11 °C (313 °F) | at 760 mmHg | CAMEO | |
| 158 °C (316.4 °F) | at 760 mmHg | DOE PAC |
1,4-Dichloro-2-butene melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | 3.5 °C (38.3 °F) | HSDB | |
| -47.78 °C (-54 °F) | CAMEO |
1,4-Dichloro-2-butene density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 1.1858 g/cm³ | HSDB | |
| 1.183 g/cm³ | technical grade mixture | HSDB | |
| 1.112 g/cm³ | at 20 °C | CAMEO |
1,4-Dichloro-2-butene solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| Solubility | Miscible with benzene, alc, carbon tetrachloride; immiscible with ethylene glycol and glycerol. | HSDB | |
| Soluble in ether. | HSDB | ||
| Water solubility = 580 mg/l at 25 °C | at 25 °C | HSDB |
1,4-Dichloro-2-butene vapor pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor pressure | 3 mmHg | at 25 °C | HSDB |
| 3 mmHg | Haz-Map |
1,4-Dichloro-2-butene lower explosive limit (LEL)
| Property | Value | Conditions | Source |
|---|---|---|---|
| Lower explosive limit (LEL) | 1.5 % by volume | CAMEO | |
| 1.5-4.0% | Dichlorobutene | HSDB | |
| Vapor may explode if ignited in an enclosed area. | Dichlorobutene | HSDB |
1,4-Dichloro-2-butene upper explosive limit (UEL)
| Property | Value | Conditions | Source |
|---|---|---|---|
| Upper explosive limit (UEL) | 4 % by volume | CAMEO |
1,4-Dichloro-2-butene corrosivity
| Property | Value | Conditions | Source |
|---|---|---|---|
| Corrosivity | Corrodes metal when wet. | Dichlorobutene | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Handling and storage
1,4-Dichloro-2-butene storage and handling
1,4-Dichloro-2-butene storage conditions
Storage temperature: ambient /Dichlorobutene/
Source: Hazardous Substances Data Bank (HSDB)
1,4-Dichloro-2-butene incompatible materials
/Dichlorobutene/ reacts slowly with water to form hydrochloric acid. /Dichlorobutene/
Source: Hazardous Substances Data Bank (HSDB)
1,4-Dichloro-2-butene reactivity
Halogenated unsaturated aliphatic compounds, such as 1,4-DICHLORO-2-BUTENE, are moderately or very reactive. Halogenated organics generally become less reactive as more of their hydrogen atoms are replaced with halogen atoms. Low molecular weight haloalkanes are highly flammable and can react with some metals to form dangerous products. Materials in this group are incompatible with strong oxidizing and reducing agents. Also, they are incompatible with many amines, nitrides, azo/diazo compounds, alkali metals, and epoxides.
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check 1,4-Dichloro-2-butene in the storage compatibility matrix →
10 · Questions
1,4-Dichloro-2-butene — frequently asked questions
What is the CAS number of 1,4-Dichloro-2-butene?
The CAS number of 1,4-Dichloro-2-butene is 764-41-0. Its EC number is 212-121-8.
What is the chemical formula of 1,4-Dichloro-2-butene?
The molecular formula of 1,4-Dichloro-2-butene is C4H6Cl2 and its molecular weight is 124.99 g/mol.
What does a 1,4-Dichloro-2-butene label have to show?
Under CLP Annex VI the label for 1,4-Dichloro-2-butene carries the pictograms Skull and crossbones, Health hazard, Corrosion and Environment and the signal word is Danger.
Is 1,4-Dichloro-2-butene flammable?
CLP Annex VI assigns 1,4-Dichloro-2-butene 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 1,4-Dichloro-2-butene a carcinogen?
Yes. CLP Annex VI classifies 1,4-Dichloro-2-butene as a category 1A or 1B carcinogen and assigns it H350: may cause cancer.
What is the boiling point of 1,4-Dichloro-2-butene?
The boiling point reported for 1,4-Dichloro-2-butene is 158 °C (316.4 °F) (HSDB).
What is the melting point of 1,4-Dichloro-2-butene?
The melting point reported for 1,4-Dichloro-2-butene is 3.5 °C (38.3 °F) (HSDB).
How should 1,4-Dichloro-2-butene be stored?
Storage temperature: ambient /Dichlorobutene/ (Hazardous Substances Data Bank (HSDB))
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