Polyurethane-42
molecular structure · PubChem
AKA: Polyurethane polymer, Film-forming agent
Synthetic
Occlusive
Not Clean
'Polyurethane-42 is a copolymer of Di-C12-13 Alkyl Tartrate, Hydrogenated Dilinoleyl Alcohol and isophorone diisocyanate
CAS #
1184186-26-2
Form
Powder
Functions
Film Forming
Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.
Creates Protective Barrier
Traditional Use
Synthetic polymer developed in the mid-20th century. Used in cosmetics as a film-forming and conditioning agent in hair and skin products.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: CosIng · EWG · CIR