Ingredient review
Diisostearoyl Trimethylolpropane Siloxy Silicate
INCI: Diisostearoyl Trimethylolpropane Siloxy Silicate
A silicone-based film former that gives a silky, smooth feel and helps makeup last longer without clogging pores.
In plain English
This ingredient is a type of silicone that forms a thin, flexible film on your skin. It helps products spread smoothly, reduces the appearance of fine lines temporarily, and makes makeup or sunscreen more water-resistant. It feels lightweight and non-greasy, so it's common in primers and long-wear foundations.
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
Diisostearoyl Trimethylolpropane Siloxy Silicate 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 Diisostearoyl Trimethylolpropane Siloxy Silicate.
- 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 synthetic silicone polymer modified with fatty acids (diisostearoyl) and a siloxy silicate backbone. It is designed to create a breathable, flexible film on the skin.
How it works
When applied, it dries down to a clear, flexible film that holds pigments in place, resists water and sweat, and gives a silky, smooth texture. It also helps other ingredients spread evenly and stay on the skin longer.
Pros
Long-wear support
Helps makeup and sunscreen stay put for hours, even in humidity or sweat.
Smooth texture
Gives a silky, velvety feel that makes products glide on easily and reduces the look of pores or fine lines.
Cons and cautions
Potential buildup
Silicones can accumulate on skin if not thoroughly cleansed, which may lead to dullness or clogged pores for some.
Not for silicone-free routines
If you prefer to avoid silicones for environmental or personal reasons, this ingredient won't fit your routine.
Best for
- People who want long-wearing makeup or water-resistant sunscreen
- Those with oily or combination skin who prefer a matte, smooth finish
Use caution if
- Those who avoid silicones for personal preference
- Very dry skin types if used in high concentrations without moisturizing ingredients
Usage tips
Safety summary
Diisostearoyl Trimethylolpropane Siloxy Silicate is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. As with all silicones, proper cleansing is recommended to avoid buildup.
Research notes
Safety assessments by cosmetic ingredient review panels and regulatory bodies support its use. Most evidence comes from industry safety data rather than independent clinical studies, but no significant safety concerns have been identified.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and many other regions. No specific restrictions beyond general cosmetic safety requirements.
- Common uses
- Foundations, Primers, Sunscreens, Long-wear makeup, Lip products
- Environmental note
- Silicones are generally not biodegradable and can accumulate in the environment. Some manufacturers are working on more eco-friendly alternatives.
Good to know
- This ingredient is often used in 'long-wear' or 'transfer-proof' makeup formulas.
- It is considered non-comedogenic for most skin types, but individual reactions can vary.
Common questions
What is Diisostearoyl Trimethylolpropane Siloxy Silicate in beauty products?
This ingredient is a type of silicone that forms a thin, flexible film on your skin. It helps products spread smoothly, reduces the appearance of fine lines temporarily, and makes makeup or sunscreen more water-resistant. It feels lightweight and non-greasy, so it's common in primers and long-wear foundations.
What does Diisostearoyl Trimethylolpropane Siloxy Silicate do in a beauty product?
When applied, it dries down to a clear, flexible film that holds pigments in place, resists water and sweat, and gives a silky, smooth texture. It also helps other ingredients spread evenly and stay on the skin longer.
Is Diisostearoyl Trimethylolpropane Siloxy Silicate safe for most people?
Diisostearoyl Trimethylolpropane Siloxy Silicate is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. As with all silicones, proper cleansing is recommended to avoid buildup.
Who should be careful with Diisostearoyl Trimethylolpropane Siloxy Silicate?
Those who avoid silicones for personal preference Very dry skin types if used in high concentrations without moisturizing ingredients
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.