Ingredient review

Acryloyloxypropyl Polysilsesquioxane

INCI: ACRYLOYLOXYPROPYL POLYSILSESQUIOXANE

A silicone-based film former that helps makeup last longer and resist water, but may feel slightly tight on dry skin.

beautyskincarefilm-former

In plain English

This is a synthetic silicone ingredient that forms a thin, flexible film on the skin. It helps makeup stay put longer, resist sweat and water, and gives a smooth, even finish. Think of it as a clear, breathable shield that locks in your look without feeling heavy.

Quick decision guide

Useful, but context matters

Acryloyloxypropyl Polysilsesquioxane is generally a lower-concern ingredient when the full formula suits your skin.

Plain-English read

Treat this as a practical screening step before you compare products that contain this ingredient.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Acryloyloxypropyl Polysilsesquioxane.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.

Score terms in plain English

Irritation risk

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A silicone resin (polysilsesquioxane) modified with acrylate groups. It is a synthetic polymer that dries down to a flexible, water-resistant film.

How it works

When applied, the solvent evaporates and the polymer chains crosslink into a continuous film. This film adheres to the skin, creating a barrier that resists water, oil, and friction. It also helps suspend pigments evenly for consistent color payoff.

Pros

Long-wear performance

Helps foundation and eyeliner stay intact for hours, even in humid conditions.

Smooth application

Creates a silky, even layer that helps pigments glide on and blend easily.

Cons and cautions

Can feel tight on dry skin

The film may emphasize dryness or feel restrictive if your skin is already parched.

Requires double cleansing

Water-resistant films need an oil-based cleanser or micellar water for thorough removal.

Best for

  • People who want long-lasting, transfer-proof makeup
  • Those with oily or combination skin who need extra staying power

Use caution if

  • Individuals with very dry or dehydrated skin who find film-formers uncomfortable

Usage tips

Use an oil-based cleanser or balm to remove products containing this ingredient.
Pair with a hydrating primer or moisturizer if you have dry skin to avoid a tight feeling.
Shake the product well before use to ensure even distribution of the polymer.

Safety summary

Acryloyloxypropyl Polysilsesquioxane is considered safe for cosmetic use. It has low irritation and comedogenic potential. The main practical concern is that it may feel drying on very dry skin and requires thorough cleansing to remove.

Research notes

Evidence is based on manufacturer safety data and regulatory reviews. There are no published peer-reviewed studies on this specific ingredient, but its chemical class (silicone resins) is well-studied and considered safe for topical use.

Common label clues

Typical concentration
1–10%
Regulatory status
Approved for use in cosmetics in the EU, US, and other major markets. No known restrictions at typical use levels.
Common uses
Long-wear foundations, Waterproof eyeliners, Lip products, Sunscreens
Environmental note
As a silicone-based polymer, it is not biodegradable and may accumulate in the environment. Some brands are exploring bio-based alternatives.

Good to know

  • This ingredient is often listed near the top of INCI for long-wear formulas because it is used at effective concentrations.
  • It is considered safe for use in cosmetics by major regulatory bodies when used as intended.

Common questions

What is Acryloyloxypropyl Polysilsesquioxane in beauty products?

This is a synthetic silicone ingredient that forms a thin, flexible film on the skin. It helps makeup stay put longer, resist sweat and water, and gives a smooth, even finish. Think of it as a clear, breathable shield that locks in your look without feeling heavy.

What does Acryloyloxypropyl Polysilsesquioxane do in a beauty product?

When applied, the solvent evaporates and the polymer chains crosslink into a continuous film. This film adheres to the skin, creating a barrier that resists water, oil, and friction. It also helps suspend pigments evenly for consistent color payoff.

Is Acryloyloxypropyl Polysilsesquioxane safe for most people?

Acryloyloxypropyl Polysilsesquioxane is considered safe for cosmetic use. It has low irritation and comedogenic potential. The main practical concern is that it may feel drying on very dry skin and requires thorough cleansing to remove.

Who should be careful with Acryloyloxypropyl Polysilsesquioxane?

Individuals with very dry or dehydrated skin who find film-formers uncomfortable

Research sources

CosIng Database - European CommissionOpenPersonal Care Council - Silicones SafetyOpenPubMed - Safety of Silicone Polymers in CosmeticsOpen

Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.