chloroprene

Also known as: 2-chloro-1,3-butadiene, β-chloroprene, 1,3-Butadiene, 2-chloro-, 2-chlorobuta-1,3-diene, 2-chloro-butadiene, Baypren 110, Baypren 216, Baypren 310, Baypren EM1, Baypren M1, Chloropren, Chloropreen, Chloroprene, Cloroprene, Neoprene AH, NSC 18589

chloroprene (CAS 126-99-8) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C4H5Cl and a molecular weight of 88.53550 g/mol. Key properties include a boiling point of 59.4ºC at 760mmHg, a density of 0,958 g/cm3 and a flash point of 11 °C. It is classified under GHS with signal word Danger and hazard statements H225 — Highly flammable liquid and vapour, H301 — Toxic if swallowed and H311 — Toxic in contact with skin. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 126-99-8
Jingsj CID: J-36756-7
Molecular Formula: C₄H₅Cl
Molecular Weight: 88.53550 g/mol
Category: Aliphatic Hydrocarbons
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	59.4ºC at 760mmHg
Density	0,958 g/cm3
Flash Point	11 °C
Exact Mass	88.00800
LogP	1.92490
Refractive Index	1.445

GHS Safety & Compliance

Flammable / Acute Toxicity / Health HazardSignal word: Danger

H225 — Highly flammable liquid and vapour
H301 — Toxic if swallowed
H311 — Toxic in contact with skin
H331 — Toxic if inhaled
H350 — May cause cancer
H370 — Causes damage to organs

Frequently Asked Questions

What is the CAS number of chloroprene?

The CAS number of chloroprene is 126-99-8.

What are the molecular formula and molecular weight of chloroprene?

chloroprene has molecular formula C4H5Cl and molecular weight 88.53550 g/mol.

Is chloroprene hazardous?

chloroprene has GHS signal word Danger and hazard statements H225 — Highly flammable liquid and vapour; H301 — Toxic if swallowed; H311 — Toxic in contact with skin.

What are the upstream and downstream products of chloroprene?

For chloroprene, Upstream Products: 1-buten-3-yne, Acetylene, 1,3-dichloro-2-butene; Downstream Products: 1,3-dichloro-2-butene, 1-Chlorocyclohexene, 5-Chloro-2-cyanopyridine.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "chloroprene (CAS 126-99-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-36756-7 (accessed 2026-11-06).

Data for reference only; verify product details with suppliers before purchase.