Surfactant
OCTYL POLYSTYRENE OXIDE/PEG-10 COPOLYMER PHOSPHATE
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
A complex surfactant polymer used to stabilize sunscreens and pigment mixes. Safe at typical use levels; main caveat is environmental persistence.
Octyl Polystyrene Oxide/PEG-10 Copolymer Phosphate (CAS 308336-62-1) is a phosphated copolymer combining polystyrene oxide and polyethylene glycol blocks with an octyl hydrophobe. It functions as a dispersant and emulsion stabilizer, especially in mineral sunscreens and pigment systems. No SCCS opinion exists; CIR has reviewed related PEG-phosphate surfactants as safe when manufacturing controls ensure low 1,4-dioxane residues. The polystyrene-oxide segment raises persistence concerns for environmental biodegradation. No GHS classification flagged at cosmetic concentrations.
Function
Skin benefits
- Effective surfactant and dispersant
- Stabilizes sunscreen and pigment formulations
- Improves spreading on skin
Known concerns
- PEG-based surfactant — 1,4-dioxane trace contamination possible if not purified
- Polystyrene-oxide segment is not biodegradable
- Limited standalone cosmetic review
References
EU CosIng database
European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.
Related surfactants
Same plant / compound family
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.