Ingredient review
Polymethylsilsesquioxane/Ethyl Polysilicate Crosspolymer
INCI: POLYMETHYLSILSESQUIOXANE/ETHYL POLYSILICATE CROSSPOLYMER
A safe, synthetic silicone powder that gives a silky, matte feel and helps control shine without clogging pores.
In plain English
This ingredient is a tiny, synthetic powder made from silicone. When you apply a product containing it, it spreads easily and feels silky on your skin. It also soaks up extra oil, helping to reduce shine and keep makeup looking fresh longer. Think of it like a very fine, invisible powder that smooths your skin's surface.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Polymethylsilsesquioxane/Ethyl Polysilicate Crosspolymer 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.
- Step 1Start with the score, then check the irritation and clogging risk before judging Polymethylsilsesquioxane/Ethyl Polysilicate Crosspolymer.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- 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
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
A crosslinked silicone polymer that forms a fine, spherical powder. It is created by combining polymethylsilsesquioxane and ethyl polysilicate into a single, stable particle.
How it works
The powder particles are small and spherical, so they roll over the skin, filling in fine lines and pores to create a smooth, even surface. They also absorb excess sebum (skin oil), which helps control shine and keeps makeup from sliding off. Because it is a powder, it does not dissolve into the skin but sits on top, providing a matte finish.
Pros
Excellent oil control
Absorbs sebum effectively, keeping skin shine-free for hours without feeling heavy or cakey.
Smooths skin texture
The spherical particles fill in pores and fine lines, creating a soft-focus effect that makes skin look more even.
Cons and cautions
Can be drying
Because it absorbs oil, it may leave very dry skin feeling tight or flaky, especially if used in large amounts.
Synthetic origin
As a man-made silicone powder, it may not be preferred by those seeking natural or biodegradable ingredients.
Best for
- People with oily or combination skin who want a matte finish
- Anyone looking for a primer or foundation that smooths skin texture
Use caution if
- Those with very dry or dehydrated skin, as it may emphasize dryness
Usage tips
Safety summary
Polymethylsilsesquioxane/Ethyl Polysilicate Crosspolymer is considered safe for use in cosmetics. It is non-irritating, non-sensitizing, and non-comedogenic. No significant safety concerns have been reported in standard use concentrations.
Research notes
Safety assessments by the Cosmetic Ingredient Review (CIR) panel have concluded that similar silicone polymers are safe in cosmetics. While specific studies on this exact crosspolymer are limited, its chemical class is well-tolerated and widely used.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics globally, including by the FDA (USA) and EU CosIng database, with no known restrictions.
- Common uses
- Foundations, Primers, Powders, Sunscreens, Moisturizers
- Environmental note
- As a silicone-based polymer, it is not biodegradable and may accumulate in the environment. However, it is used in small amounts and is not a microplastic in the traditional sense.
Good to know
- This ingredient is often used in powder foundations and setting powders for its lightweight feel.
- It is considered non-comedogenic, meaning it is unlikely to clog pores.
Common questions
What is Polymethylsilsesquioxane/Ethyl Polysilicate Crosspolymer in beauty products?
This ingredient is a tiny, synthetic powder made from silicone. When you apply a product containing it, it spreads easily and feels silky on your skin. It also soaks up extra oil, helping to reduce shine and keep makeup looking fresh longer. Think of it like a very fine, invisible powder that smooths your skin's surface.
What does Polymethylsilsesquioxane/Ethyl Polysilicate Crosspolymer do in a beauty product?
The powder particles are small and spherical, so they roll over the skin, filling in fine lines and pores to create a smooth, even surface. They also absorb excess sebum (skin oil), which helps control shine and keeps makeup from sliding off. Because it is a powder, it does not dissolve into the skin but sits on top, providing a matte finish.
Is Polymethylsilsesquioxane/Ethyl Polysilicate Crosspolymer safe for most people?
Polymethylsilsesquioxane/Ethyl Polysilicate Crosspolymer is considered safe for use in cosmetics. It is non-irritating, non-sensitizing, and non-comedogenic. No significant safety concerns have been reported in standard use concentrations.
Who should be careful with Polymethylsilsesquioxane/Ethyl Polysilicate Crosspolymer?
Those with very dry or dehydrated skin, as it may emphasize dryness
Research sources
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.