Good Cosmetic Ingredient

Trimethylsiloxysilicate

INCI: TRIMETHYLSILOXYSILICATE

Trimethylsiloxysilicate (CAS 68909-20-6) is a cosmetic cosmetic ingredient functioning as film-forming, transfer-resistant binder, long-wear agent, sunscreen adhesion aid. EU Regulation 1223/2009 status: permitted.

CAS Number
68909-20-6
Function
film-forming, transfer-resistant binder, long-wear agent, sunscreen adhesion aid
Safety Rating
GOOD

Regulatory Status

🇪🇺 EU Status permitted
🇺🇸 US Status permitted
US Notes No FDA restriction; widely used in long-wear color cosmetics, waterproof sunscreens, and transfer-resistant foundations; no safety restrictions

For full compliance data across multiple jurisdictions, use the Substance Compliance tool.

Safety Data

Margin of Safety, dermal absorption, and sensitization profile summaries for Trimethylsiloxysilicate - available to Pro subscribers.

Calculate MoS for your specific formulation with the MoS Calculator.

EU CLP Annex VI Harmonized Classification

Legally binding harmonized classification per Regulation (EC) No 1272/2008 (CLP) Annex VI.

Signal Word
Warning
Pictograms
Health Hazard
Hazard Class and Category
STOT RE 2
Hazard Statements
  • H373 (inhalation) (lungs)

Inserted via ATP: 2023-11-23

Additional Ingredient Properties

10 property records from structured ingredient metadata.

comedogenicity_detail
{"comedogenicity_rating": "1", "irritancy_rating": "0", "skin_type_suitability": "all,oily,combination,normal,acne-prone", "acne_safe": "yes", "source": "Resinous silicone"}
cost_pricing
{"cost_tier": "mid-range", "estimated_cost_per_kg_usd_low": "25", "estimated_cost_per_kg_usd_high": "45", "natural_premium_markup_pct": "0", "organic_certified_premium_pct": "0", "supply_chain_volatility": "low", "primary_source_region": "Global", "bulk_discount_threshold_kg": "100", "seasonal_price_variation": "low", "commodity_or_specialty": "specialty", "substitute_ingredients": "Dimethicone Cr…
deodorant
{"cas_number": "68909-20-6", "ingredient_class": "other", "mechanism_of_action": "other", "antiperspirant_efficacy_sweat_reduction_pct": "0", "deodorant_efficacy_hours": "0", "odor_reduction_pct": "0", "bacteriostatic": "no", "bactericidal": "no", "microbiome_impact": "neutral", "axillary_microbiome_effect": "varies by ingredient", "MIC_value_if_antimicrobial": "varies", "astringency_level": "vari…
ecotoxicity
{"biodegradable": "no", "biodegradation_days": "365+", "bioaccumulative": "yes", "aquatic_toxicity_level": "low", "coral_reef_safe": "unknown", "marine_toxicity": "low acute toxicity", "freshwater_toxicity": "persistent", "soil_toxicity": "accumulates", "endocrine_disruptor": "no", "persistent_organic_pollutant": "yes", "microplastic": "no", "nano_particle": "no", "hawaii_banned": "no", "eu_restri…
hair_care
{"hair_function": "styling", "hair_type_suitability": "fine/medium", "curl_pattern_suitability": "all", "porosity_suitability": "all", "protein_sensitivity": "neutral", "moisture_protein_balance": "no", "cg_method_approved": "non-water-soluble", "silicone_type": "not-a-sulfate", "sulfate_type": "no", "drying_alcohol": "no", "fatty_alcohol": "yes", "heat_protectant": "yes", "color_safe": "neutral",…
polymer
{"ingredient_class": "film_former/waterproofing_agent", "polymer_type": "silicone_based", "chemical_backbone": "other", "molecular_weight_Da_range": "1000-10000", "ionic_character": "nonionic", "pH_viscosity_sensitivity": "moderate", "salt_tolerance": "moderate", "electrolyte_effect_on_viscosity": "moderate", "temperature_viscosity_sensitivity": "moderate", "film_transparency": "transparent", "fil…
regulatory
{"eu_status": "allowed", "us_status": "allowed"}
sensory
{"silky": "silky", "smooth, glides easily": "smooth, water-resistant", "dry-touch, non-greasy": "protected, matte", "instant": "fast", "low": "low", "w/o": "w/o", "very-high": "high", "no": "yes", "yes": "yes", "light-diffusing": "matte", "1.40": "1.40", "transparent": "transparent", "colorless": "colorless", "excellent": "good", "light": "light", "synthetic": "synthetic"}

Function Categories & List Membership

Cosmetic/Chemical Function Categories
Filler Processing aids not otherwise specified Surface modifier Thickening agent
Regulatory List Membership (1)
EPA Safer Chemical Ingredients List (SCIL)

Expert Verdict

Expert safety assessment and concern-level summary for Trimethylsiloxysilicate - available to Pro subscribers.

Regulatory Flags

non-volatile-silicone film-former transfer-resistant waterproof long-wear silicone-resin cosmos-prohibited epa_safer_alternative

Frequently Asked Questions

Is Trimethylsiloxysilicate safe in cosmetics?

Three-dimensional MQ silicone resin providing water-resistant, transfer-resistant film in color cosmetics, waterproof sunscreens, and long-wear foundations. Not subject to EU cyclic siloxane restrictions. Excellent safety profile with no dermal penetration and no significant sensitization concerns. The EU classifies Trimethylsiloxysilicate as "permitted". Safety rating: GOOD.

Is Trimethylsiloxysilicate allowed in the EU?

Trimethylsiloxysilicate EU regulatory status: permitted. This is based on EU Regulation 1223/2009 and its amendments.

What does Trimethylsiloxysilicate do in cosmetics?

Trimethylsiloxysilicate functions as: film-forming, transfer-resistant binder, long-wear agent, sunscreen adhesion aid. It is classified as a cosmetic ingredient in our database. CAS number: 68909-20-6.

What is the Margin of Safety for Trimethylsiloxysilicate?

adequate The Margin of Safety (MoS) is calculated using SCCS methodology. A MoS above 100 is generally considered safe. Use the MoS Calculator tool to calculate MoS for your specific formulation and product category.

Compliance Tools

Check Trimethylsiloxysilicate compliance across multiple jurisdictions:

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Ingredient Decoder
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82 Allergen Checker
Check for EU declarable fragrance allergens
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Substance Compliance
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MoS Calculator
Calculate Margin of Safety using SCCS methodology
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Heavy Metal Limits
Compare limits across jurisdictions

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