Cellulose Acetate Butyrate
AKA: CAB, Cellulose acetate butyrate resin
Synthetic
Occlusive
Clean
Cellulose, acetates, butanoates
CAS #
9004-36-8
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
Antioxidant Protection
Reduces Inflammation
Fights Bacteria
Traditional Use
Developed in the early 20th century as a semi-synthetic polymer derived from cellulose. Used in cosmetics since the 1930s as a film-forming agent and texture enhancer in nail polishes, mascaras, and hair products.
Skin Types
●all-skin-types, gentle
Best For
General
Pregnancy & Breastfeeding Safe
Yes
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.
Verified Jun 2026
Data: CosIng · EWG · CIR