murphyBis-Isobutyl PEG-24/PPG-7/Dimethicone Copolymer
molecular structure · PubChem
AKA: Silicone Copolymer, Silicone Blend
Synthetic
Humectant
Occlusive
Silicone
Not Clean
OriginSynthesized from polydimethylsiloxane (silicone) polymers combined with polyethylene glycol and polypropylene glycol units. Produced through step-wise polymerization and coupling reactions to create the branched copolymer structure.
Bis-Isobutyl PEG-24/PPG-7/Dimethicone Copolymer is a block copolymer of polyethylene glycol, polypropylene glycol and Dimethicone containing an average of 24 moles of ethylene oxide and 7 moles of propylene oxide
CAS #
158451-77-5
Form
Liquid
State
Solid
Skin Types
●all-skin-types
Best For
Dryness
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.
Humectant
A moisture magnet. Pulls water from the air and deeper skin layers up to the surface to keep skin plump and hydrated.
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
Not a Sensitizer
1 study / 1 not sensitizing (CIR 664)
Concentration Guide
CIR lists it as not reported to be in use.
CIR · report published 2014
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR