Is Trimethylsiloxysilicate safe in cosmetics?
Trimethylsiloxysilicate has a safety rating of "GOOD" in our database. EU status: permitted. US status: permitted.
Good
Cosmetic Ingredient
Trimethylsiloxysilicate
Also known as: EINECS 272-697-1, Hexamethyldisilazane, silica reaction product, Hydrolysis products of 1,1,1-trimethyl-N-(trimethylsilyl)silanamine with silica
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. Industrial safety data is also available in the chemical safety database.
View industrial chemical safety profile for CAS 68909-20-6 →
Auto-generated CPSR Part A draft with source citations
Function
film-forming, transfer-resistant binder, long-wear agent, sunscreen adhesion aid
Safety Rating
GOOD
Regulatory Status
EU EU Status
permitted
US 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.
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: ATP18
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.
Regulatory Flags
non-volatile-silicone
film-former
transfer-resistant
waterproof
long-wear
silicone-resin
cosmos-prohibited
epa_safer_alternative
Known Synonyms
EINECS 272-697-1
Hexamethyldisilazane, silica reaction product
Hydrolysis products of 1,1,1-trimethyl-N-(trimethylsilyl)silanamine with silica
Chemical Function
Processing aids not otherwise specified
Filler
Surface modifier
Thickening agent
Regulatory Lists
SCIL (9/2019)
CEDI
inert_ingredient; Pesticides
inert_ingredient; non_food_use; Pesticides
Australian Status
AICIS status: listed
Frequently Asked Questions
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.
Compliance Tools
Check Trimethylsiloxysilicate compliance across multiple jurisdictions:
Ingredient Decoder
Paste a full ingredient list for instant analysis
82 Allergen Checker
Check for EU declarable fragrance allergens
Substance Compliance
Check compliance across multiple jurisdictions
MoS Calculator
Calculate Margin of Safety using SCCS methodology
Heavy Metal Limits
Compare limits across jurisdictions
Related Ingredients
PVP
Excellent
Same category
film-forming, adhesion promoter, hair...
Acrylates Copolymer
Good
Same category
film-forming, adhesion promoter, long...
Acrylates/Octylacrylamide Copolymer
Good
Same category
Film-forming polymer; waterproofing, ...
Acrylates/VA Copolymer
Good
Same category
Film former; binder; viscosity contro...
Adipic Acid/Diethylene Glycol/Glycerin Crosspolymer
Good
Same category
Film-former; bodying agent; adhesion aid
Dimethiconol
Good
Same category
film-forming, hair conditioning, emol...
(AGARICUS BLAZEI FERMENT + GANODERMA LUCIDUM FERMENT + GANODERMA MULTIPILEUM FERMENT) EXTRACT
Good
Similar safety
Anti-sebum, Antioxidant, Skin Protecting
(ANGELICA ACUTILOBA/PAEONIA LACTIFLORA/REHMANNIA GLUTINOSA) ROOT/CNIDIUM OFFICINALE RHIZOME EXTRACT
Good
Similar safety
Skin Conditioning, Skin Conditioning ...
(ANGELICA ACUTILOBA/PAEONIA LACTIFLORA/REHMANNIA GLUTINOSA/SCUTELLARIA BAICALENSIS) ROOT/(CNIDIUM OFFICINALE/COPTIS CHINENSIS) RHIZOME/GARDENIA JASMINOIDES FRUIT/PHELLODENDRON CHINENSE BARK EXTRACT
Good
Similar safety
(ANGELICA GIGAS/GLYCYRRHIZA URALENSIS/REHMANNIA GLUTINOSA ROOT)/ANGELICA GIGAS STEM/CARTHAMUS TINCTORIUS FLOWER/(CARTHAMUS TINCTORIUS/PRUNUS PERSICA SEED)PORIA COCOS WATER
Good
Similar safety
Humectant, Skin Conditioning, Skin Pr...
(ANGELICA KEISKEI/CHRYSANTHEMUM ZAWADSKII) LEAF/STEM/CINNAMOMUM CASSIA BARK/TRICHOSANTES KIRILOWII FRUIT/ULMUS DAVIDIANA BARK/ROOT/(PAEONIA JAPONICA/BUPLEURUM FALCATUM/POLYGALA TENUIFOLIA ROOT)/VISCUS ALBUM STEM EXTRACT
Good
Similar safety
Anti-seborrheic, Anti-sebum, Antioxid...
(APPLE/CITRUS JUNOS/LENTIL/PEAR/PUMPKIN/STRAWBERRY/TOMATO FRUIT)/CORN KERNEL/(ARCTIUM LAPPA/BRASSICA OLERACEA ACEPHALA/CABBAGE/CAMELLIA SINENSIS/MORINGA OLEIFERA/RADISH/SPINACH LEAF)/(SORGHUM BICOLOR LEAF/STEM)/OAT MEAL/POTATO PULP/(CARROT/NELUMBO NUCIFERA/RADISH/WILD YAM ROOT)/(AMARANTHUS HYPOCHONDRIACUS/CASHEW/CICER ARIETINUM/COIX LACRYMA-JOBI MA-YUEN /MACADAMIA TERNIFOLIA/PHASEOLUS ANGULARIS/PISTACIA VERA/RHYNCHOSIA NULUBILIS/RICE/SESAME/SETARIA ITALICA/SOYBEAN/SWEET ALMOND/WHEAT SEED)/HORDEUM VULGARE SPROUT/CYPERUS ESCULENTUS TUBER/ARTEMISIA PRINCEPS/BROCCOLI/CHENOPODIUM QUINOA/ENTEROMORPHA COMPRESSA/HORDEUM VULGARE/IPOMOEA BATATAS/LAMINARIA JAPONICA/LENTINUS EDODES/PLEUROTUS OSTREATUS/PORPHYRA TENERA/UNDARIA PINNATIFIDA EXTRACT
Good
Similar safety
Antioxidant
Silica Silylate
Good
Chemical family
Anticaking, Antifoaming, Bulking, Emu...
TRI (POLYGLYCERYL-3/LAURYL) HYDROGENATED TRILINOLEATE
Good
Browse nearby
Surfactant - Cleansing, Surfactant - ...
TRICHLOROMETHYL PHENYL CARBINYL ACETATE
Good
Browse nearby
Perfuming
Is Trimethylsiloxysilicate in Your Products?
Scan any product label with Piro — our free ingredient scanner. Point your camera at the ingredients list and get instant safety scores for every ingredient.
Try Piro Free →Analyze Your Full Ingredient List
Paste any INCI list into the Decoder for instant safety analysis, or calculate the Margin of Safety for Trimethylsiloxysilicate in your formulation.