Isoprene/Pentadiene Copolymer

AKA: Synthetic Rubber
Synthetic
Not Clean
OriginIsoprene and pentadiene monomers are derived from petroleum hydrocarbons through fractional distillation and cracking processes. The monomers are polymerized together using catalytic polymerization to form the copolymer film-forming agent.
1,3-Pentadiene, polymer with 2-methyl-1,3-butadiene
CAS #
31303-93-2
Form
Liquid
State
Solid
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Viscosity Controlling
Controls Viscosity
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
4
CIR
Safe as used
Pregnancy
Yes
Concentration Guide
CIR lists it as not reported to be in use.
CIR · report published 2020
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: CosIng · EWG · CIR