Overview
Chloroprene (CAS 126-99-8 ), also known as 2-chlorobutadiene, is the primary monomer used in the production of polychloroprene, one of the most commercially significant synthetic elastomers.
It undergoes controlled polymerization to yield a rubber with strong resistance to oils, weathering, and flame. These properties determine its suitability across demanding industrial applications.
The dominant use of this monomer is in the manufacture of neoprene rubber, where it is polymerized to produce sheets, adhesives, foams, and molded goods for global markets.
In the automotive and construction sectors, polychloroprene is processed into belts, hoses, seals, and gaskets. These components must perform under mechanical stress and chemical exposure.
Adhesive formulators rely on polychloroprene-based contact adhesives for bonding dissimilar substrates. This is common in footwear, furniture, and panel assembly industries.
Specialty wire and cable jacketing also depends on polychloroprene for its flame-retardant characteristics. This is essential for safety in demanding electrical installations.
The product is supplied as a stabilized liquid monomer, typically in bulk or isotank quantities. It is handled under inhibited conditions to prevent premature polymerization during transit.
Technical-grade specifications are standard for industrial supply. Purity levels and inhibitor content are defined per buyer or process requirements to ensure consistent performance.
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Physical Properties
| Melting Point | -130 °C |
| Boiling Point | 59.4 °C |
| Density | 0.956 g/cm³ @ Temp: 20 °C |
| Flash Point | 11 °C |
| Appearance | Chloroprene is a colorless, flammable liquid possessing a pungent odor. The Odor Threshold is 0.4 milligram per cubic meter |
| Form | Colorless liquid |
| Water Solubility | 256mg/L at 20℃ |
| Vapor Pressure | 118 at 10 °C, 200 at 20 °C, 275 at 30 °C (quoted, Verschueren, 1983) |
| Refractive Index | 1.4583 |
| Log P | 2.525 at 20℃ |
Safety & Handling
Danger GHS02 GHS07 GHS08 GHS06 GHS09 Hazard Statements H225 Highly Flammable liquid and vapor H301 Toxic if swallowed H302 Harmful if swallowed H310 Fatal in contact with skin H311 Toxic in contact with skin H315 Causes skin irritation H319 Causes serious eye irritation H331 Toxic if inhaled H332 Harmful if inhaled H335 May cause respiratory irritation H340 May cause genetic defects H350 May cause cancer H351 Suspected of causing cancer H360 May damage fertility or the unborn child H361 Suspected of damaging fertility or the unborn child H370 Causes damage to organs H371 May cause damage to organs H372 Causes damage to organs through prolonged or repeated exposure H373 May causes damage to organs through prolonged or repeated exposure H411 Toxic to aquatic life with long lasting effects H302+H332 Harmful if swallowed or if inhaled Precautionary Statements P203 Obtain, consult and follow expert instructions for use. P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking. P233 Keep container tightly closed. P240 Ground and bond container and receiving equipment. P241 Use explosion-proof [electrical/ventilating/lighting/…] equipment. P242 Use non-sparking tools. P243 Take action to prevent static discharges. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P262 Do not get in eyes, on skin, or on clothing. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P316 Get emergency medical help immediately. P317 Get emergency medical help. P318 IF exposed or concerned, get medical advice. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P330 Rinse mouth. P391 Collect spillage. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P316 Get emergency medical help immediately. P301+P317 Get emergency medical help. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P308+P316 Get emergency medical help immediately. P332+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P361+P364 Take off immediately all contaminated clothing and wash it before reuse. P362+P364 Take off contaminated clothing and wash it before reuse. P370+P378 Use … for extinction. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P403+P235 Store in a well-ventilated place. Keep cool. P303+P361+P353 IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water/shower. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| Storage Class | 3 - Flammable liquids |
| WGK (Germany) | 3 |
Other Names
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Chemical Properties
- CAS Number
- 126-99-8
- EC Number
- 204-818-0
- Mol. Weight
- 88.53
- Category
- Monomers & Building Blocks