murphyPentaerythrityl Tetra C5-9 Acid Esters
molecular structure · PubChem
AKA: Pentaerythritol Ester
Synthetic
Skin Conditioner
Hair Care
Acid
Not Clean
OriginDerived from pentaerythritol, a synthetic alcohol, and branched C5-C9 carboxylic acids or their equivalents. Produced through esterification reaction between pentaerythritol and mixed fatty acids under catalytic conditions.
Carboxylic acids, C5-9, tetraesters with pentaerythritol
CAS #
67762-53-2
State
Solid
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Hair Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Plasticiser
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Locks in moisture
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.
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Skin Irritant in Testing
2 studies / 2 irritating / reactions minimal to slight (CIR 585)
Concentration Guide
CIR lists it as not reported to be in use.
CIR · report published 2015
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR