Ingredient review

Silsesquioxane Dimethicone Crosspolymer

INCI: Polymethyl/Octyl/Phenyl/Propylsilsesquioxane Dimethicone Crosspolymer

A silicone powder that gives a silky, matte finish and helps control oil without clogging pores.

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In plain English

This ingredient is a synthetic silicone powder. It feels silky and smooth on the skin and helps absorb excess oil, giving a matte finish. It also helps other ingredients spread evenly and can make the skin feel soft without being greasy.

Review score

Safety, usefulness, and evidence

4.0Good
4.0/ 5

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
How reviews are scored

Quick decision guide

Useful, but context matters

Silsesquioxane Dimethicone 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Silsesquioxane Dimethicone Crosspolymer.
  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 crosslinked silicone polymer that forms a fine, spherical powder. It is made by combining silsesquioxane (a silicone resin) with dimethicone (a common silicone oil) to create a soft, absorbent particle.

How it works

When applied, the powder particles sit on the skin's surface and absorb oil and sebum. They also help other ingredients like pigments spread more evenly and create a smooth, blurring effect on fine lines and pores.

Pros

Oil control

Effectively absorbs excess sebum, helping to reduce shine throughout the day without feeling heavy.

Smooth texture

Creates a silky, velvety feel on the skin and helps makeup apply more evenly, minimizing the look of pores.

Cons and cautions

Potential dryness

Because it absorbs oil, it can leave very dry skin feeling tight or flaky if used in high amounts.

Synthetic origin

As a lab-made silicone, 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 smooth, blurring primer or foundation

Use caution if

  • Those with very dry or dehydrated skin who prefer a dewy finish

Usage tips

Use in powder or primer form for best oil-control results.
If you have dry skin, layer a hydrating moisturizer underneath to avoid a matte finish that feels too dry.
Shake well before use if in a loose powder to ensure even distribution.

Safety summary

Considered safe for topical use in cosmetics. Low irritation and comedogenic risk. No significant safety concerns reported in routine use.

Research notes

Limited independent studies specifically on this ingredient, but silicone crosspolymers in general are well-tolerated and widely used. Safety assessments by cosmetic ingredient review panels support its use.

Common label clues

Typical concentration
1% to 10%
Regulatory status
Approved for use in cosmetics globally, including by the FDA and EU CosIng database. No known restrictions.
Common uses
Foundations, Primers, Powders, Sunscreens
Environmental note
As a silicone-based polymer, it is not biodegradable and may accumulate in the environment. Some manufacturers are exploring bio-based alternatives.

Good to know

  • This ingredient is often used in 'blur' products to soften the appearance of fine lines and pores.
  • It is considered non-comedogenic, meaning it is unlikely to clog pores.

Common questions

What is Silsesquioxane Dimethicone Crosspolymer in beauty products?

This ingredient is a synthetic silicone powder. It feels silky and smooth on the skin and helps absorb excess oil, giving a matte finish. It also helps other ingredients spread evenly and can make the skin feel soft without being greasy.

What does Silsesquioxane Dimethicone Crosspolymer do in a beauty product?

When applied, the powder particles sit on the skin's surface and absorb oil and sebum. They also help other ingredients like pigments spread more evenly and create a smooth, blurring effect on fine lines and pores.

Is Silsesquioxane Dimethicone Crosspolymer safe for most people?

Considered safe for topical use in cosmetics. Low irritation and comedogenic risk. No significant safety concerns reported in routine use.

Who should be careful with Silsesquioxane Dimethicone Crosspolymer?

Those with very dry or dehydrated skin who prefer a dewy finish

Research sources

CosIng - European Commission databaseOpenPersonal Care Council - Silicone SafetyOpenPubMed - Silicone polymers in dermatologyOpen

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.