murphyPolybutene
AKA: Polybutylene, Butylene polymer
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Nécessaire
Lit Up Highlight Stick - Biscuit
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Lit Up Highlight Stick - Garçonne
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Lit Up Highlight Stick - Lit
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Lit Up Highlight Stick
Westman Atelier
Synthetic
Clean
OriginProduced from petroleum-derived hydrocarbons through polymerization of butene monomers. Synthesized via catalytic polymerization to create a long-chain hydrocarbon polymer.
Polybutene is the polymer formed by the polymerization of a mixture of iso- and normal butenes.
CAS #
9003-28-5, 9003-29-6
Form
Powder
Skin Types
●all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
Functions
Binding
Viscosity Controlling
Holds Formula Together
Controls Viscosity
Antioxidant Protection
Reduces Inflammation
Wound Healing
Holds ingredients together
Controls product thickness
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed4 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 a Sensitizer
6 studies / 6 not sensitizing (CIR 232 and 687)
Not Phototoxic
Product formulation test found no phototoxicity in the CIR safety assessment (CIR 232 and 687)
Mixed Eye Irritation Results
9 studies / 4 irritating / 1 mixed / 4 not irritating / reactions minimal to mild (CIR 232 and 687)
Mixed Skin Irritation Results
19 studies / 7 irritating / 1 mixed / 11 not irritating / reactions mild (CIR 232 and 687)
Concentration Guide
Leave-on0.1–82.4%
Rinse-off8–20%
0%50%100%
CIR reported use · 2013 survey
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR