murphyPolybutylene Terephthalate
AKA: Polyester resin
Synthetic
Occlusive
Clean
OriginSynthesized from petroleum-derived terephthalic acid and butanediol through esterification and polymerization reactions. Produced via polycondensation of dimethyl terephthalate or terephthalic acid with butylene glycol at high temperatures.
1,4-Benzenedicarboxylic acid, polymer with 1,4-butanediol
CAS #
26062-94-2
Form
Powder
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Film Forming
Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.
Viscosity Controlling
Creates Protective Barrier
Controls Viscosity
Reduces Inflammation
Wound Healing
Fights Bacteria
Creates protective layer
Controls product thickness
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not an Eye Irritant
1 study / 1 not irritating (CIR 629)
Not a Sensitizer
1 study / 1 not sensitizing (CIR 629)
Concentration Guide
Leave-on0.006–12%
Rinse-off0.2%
0%50%100%
CIR reported use · report published 2014
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR