Polypropylsilsesquioxane

Synthetic

Occlusive

Silicone

Clean

Polymer formed by hydrolysis and condensation of propyltrichlorosilane

CAS #

36088-62-7

Form

Powder

Functions

Film Forming

Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.

Creates Protective Barrier

Traditional Use

A synthetic silicone-based polymer developed in the late 20th century for cosmetics. Designed to provide lightweight texture, slip, and mattifying properties as a modern alternative to talc and mineral powders.

EWG

CIR

Safe as used

Pregnancy

Yes

CIR Safety Findings

Not a Sensitizer

medical-approval

all-shades-safe

Regulatory Status

USA✔ permitted

EU⚠ restricted

JAPAN⚠ restricted

CANADA⚠ restricted

Regulatory Agencies

EWG CIR FDA EU COSING Health Canada

Skin Types

●all-skin-types

Best For

General

Pregnancy & Breastfeeding Safe

Yes

The paper trail

🔬Peer-reviewednone on file

⚖️Regulatory1 listing →

🛡️Safety-assessed2 reviews →

Counts, not a verdict. A listing isn't a study. The trail, you decide.

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Verified Jun 2026

Data: CosIng · EWG · CIR