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Polyisoprene

Also known as: Isoprene rubber, IR, Synthetic natural rubber, cis-1,4-Polyisoprene, Isoprene homopolymer

Polyisoprene (CAS 9003-31-0) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C14H28O2 and a molecular weight of 228.37100 g/mol. Key properties include a boiling point of 122-142ºC(lit.), a density of 0.92 g/mL at 25ºC and a flash point of >110.0 °C. It is classified under GHS with signal word Danger and hazard statements H226 — Flammable liquid and vapour, H304 and H312 — Harmful in contact with skin. No supplier offers are currently listed; request a quote. Record last updated Nov 3, 2026.

CAS No.
9003-31-0
Jingsj CID
J-1507283-6
Molecular Formula
C14H28O2
Molecular Weight
228.37100 g/mol
Category
Aliphatic Hydrocarbons
Last updated
11/3/2026
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Physicochemical Properties

Boiling Point122-142ºC(lit.)
Density0.92 g/mL at 25ºC
Flash Point>110.0 °C
Exact Mass228.20900
PSA18.46000
LogP4.13610
Refractive Indexn20/D 1.521
Storage Conditions2-8°C

GHS Safety & Compliance

Flammable / Irritant / Health HazardSignal word: Danger
  • H226 — Flammable liquid and vapour
  • H304
  • H312 — Harmful in contact with skin
  • H332 — Harmful if inhaled
  • H315 — Causes skin irritation
  • H319 — Causes serious eye irritation
  • H335 — May cause respiratory irritation
  • H412 — Harmful to aquatic life with long lasting effects

Frequently Asked Questions

What is the CAS number of Polyisoprene?

The CAS number of Polyisoprene is 9003-31-0.

What are the molecular formula and molecular weight of Polyisoprene?

Polyisoprene has molecular formula C14H28O2 and molecular weight 228.37100 g/mol.

Is Polyisoprene hazardous?

Polyisoprene has GHS signal word Danger and hazard statements H226 — Flammable liquid and vapour; H304; H312 — Harmful in contact with skin.

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

Last updated:

How to cite: Jingsj. "Polyisoprene (CAS 9003-31-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1507283-6 (accessed 2026-11-06).

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