C4H5Cl
88.53 g/mol
Industrial ChemicalDanger
2-Chlorobuta-1,3-diene
CAS126-99-8EC204-818-0
Category
Industrial Chemical
Compound Class
Halocarbon
Primary Use
Manufacture of synthetic rubber neoprene
2-Chlorobuta-1,3-diene, commonly known as chloroprene, is an industrial chemical primarily used in the manufacture of synthetic rubber. According to the International Agency for Research on Cancer (IARC) and the National Toxicology Program, chloroprene can cause cancer.
Manufacture of synthetic rubber (neoprene and polychloroprene latex)Chemical intermediate in the production of artificial rubberComponent of adhesives intended for use in food packaging
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
Restricted or banned substances
Substances on this list are banned or restricted under the named regulation. This page is a compliance reference — verify your obligations under applicable law.
Relevant lists:California Proposition 65
CAS 126-99-8
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plastic stabilizer additive
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Chemical intermediate
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Research chemical intermediate
Safety Reference
Danger
H225Highly flammable liquid and vapour
H302Harmful if swallowed
H315Causes skin irritation
H319Causes serious eye irritation
H332Harmful if inhaled
H335May cause respiratory irritation
H350May cause cancer
H373May cause damage to organs through prolonged or repeated exposure
H301Toxic if swallowed
H371May cause damage to organs
H411Toxic to aquatic life with long lasting effects
H310Fatal in contact with skin
H331Toxic if inhaled
H351Suspected of causing cancer
H361Suspected of damaging fertility or the unborn child
H370Causes damage to organs
H372Causes damage to organs through prolonged or repeated exposure
H311Toxic in contact with skin
H340May cause genetic defects
H360May damage fertility or the unborn child
Customs Tariff Classification
The international HS code for 2-Chlorobuta-1,3-diene (CAS 126-99-8) is 2903.29.
HS code (international, 6-digit)
2903.29
EU CN code (8-digit)
2903 29 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
2-chlorobuta-1,3-diene
InChIKey
YACLQRRMGMJLJV-UHFFFAOYSA-N
SMILES
C=CC(=C)Cl
Synonyms (31)
- .beta.-Chlorobutadiene
- 1,3-Butadiene, 2-chloro-
- 2-Chloor-1,3-butadieen
- 2-Chlor-1,3-butadien
- 2-Chlor-1,3-butadien [German]
- 2-Chloro-1,3-butadiene
- 2-Chlorobuta-1,3-diene
- 2-Chlorobutadiene
- 2-Chlorobutadiene 1,3
- 2-Chloroprene
- 2-Cloro-1,3-butadiene
- CHLORO-1,3-BUTADIENE, 2-
- Chlorobutadiene
- Chloropreen
- Chloropreen [Dutch]
- Chloropren
- Chloropren [German, Polish]
- Chloroprene, inhibited
- Chloroprene, uninhibited
- Cloroprene
- Cloroprene [Italian]
- beta-Chloroprene