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Ethyl Trisiloxane, also known as 3‑ethylheptamethyltrisiloxane, is a low‑viscosity cyclic siloxane featuring three silicon atoms connected by oxygen atoms with ethyl substitution.
Ethyl Trisiloxane is prized in cosmetic formulations as a skin-conditioning emollient and viscosity controlling agent that evaporates quickly for a lightweight, non-greasy feel.
CAS Number: 17861‑60‑8
EC / COSING Number: Not listed; INCI reference 56068
Molecular Formula: C₉H₂₆O₂Si₃
Molecular Weight: ~250.56 g/mol
Synonyms: Ethyl Trisiloxane, 3‑ethylheptamethyltrisiloxane, Trisiloxane, 3‑ethyl‑1,1,1,3,5,5,5‑heptamethyl‑, Ethyl‑methyl‑bis(trimethylsilyloxy)silane, Ethyl methyl bis(trimethylsilyloxy)silane, Silsoft ETS, Momentive Silsoft ETS, ENNOX Ethyl trisiloxane, Ethyl methicone (trisiloxane), Methylethylbis(trimethylsilyloxy)silane, Y‑14877, INCI Ethyl Trisiloxane, CAS 17861‑60‑8, EC 469‑070‑1, PubChem CID 140291, UNII ZH1WJO5481, DTXSID 80170518, Silicone viscosity controlling agent, Cosmetic-grade trisiloxane, Volatile linear siloxane, Siloxane skin conditioner, Siloxane spreading agent, Cosmetic carrier fluid Ethyl Trisiloxane, Ethyl Trisiloxane; 3‑ethylheptamethyltrisiloxane; Ethyl‑methyl‑bis(trimethylsilyloxy)silane; Ethyl methicone; Silsoft ETS
APPLICATIONS
Ethyl Trisiloxane is used in personal care formulations as a spreading agent.
Ethyl Trisiloxane is used in hair serums to improve combability and gloss.
Ethyl Trisiloxane is used in sunscreens to enhance even application on the skin.
Ethyl Trisiloxane is used in skincare products for its lightweight, non-greasy texture.
Ethyl Trisiloxane is used in color cosmetics to help foundation and BB creams spread smoothly.
Ethyl Trisiloxane is used in antiperspirants and deodorants for fast drying.
Ethyl Trisiloxane is used in makeup removers due to its ability to dissolve oily residues.
Ethyl Trisiloxane is used in shaving products to provide smooth glide and comfort.
Ethyl Trisiloxane is used in hair sprays for a soft, flexible finish.
Ethyl Trisiloxane is used in conditioning treatments for its ability to enhance shine.
Ethyl Trisiloxane is used in aftershaves and balms for quick absorption.
Ethyl Trisiloxane is used in facial mists for light skin feel and evaporation.
Ethyl Trisiloxane is used in primers to create a smooth base before makeup.
Ethyl Trisiloxane is used in anti-aging creams to deliver active ingredients evenly.
Ethyl Trisiloxane is used in foundations for improved blending and silky finish.
Ethyl Trisiloxane is used in body lotions for a quick-drying, powdery afterfeel.
Ethyl Trisiloxane is used in eye creams to prevent greasy residue.
Ethyl Trisiloxane is used in lip products to improve application glide.
Ethyl Trisiloxane is used in nail care products for high-spread formulations.
Ethyl Trisiloxane is used in makeup setting sprays for uniform coverage.
Ethyl Trisiloxane is used in cream-to-powder makeup for a smooth texture transition.
Ethyl Trisiloxane is used in facial masks to increase ease of application.
Ethyl Trisiloxane is used in face oils to reduce tackiness and enhance spread.
Ethyl Trisiloxane is used in serums to reduce viscosity while improving delivery.
Ethyl Trisiloxane is used in liquid highlighters for light dispersion and blending.
Ethyl Trisiloxane is used in roll-on products to improve flow and evaporation.
Ethyl Trisiloxane is used in men's grooming products for quick absorption.
Ethyl Trisiloxane is used in hydrating gels to create a smooth skin finish.
Ethyl Trisiloxane is used in BB creams for weightless texture.
Ethyl Trisiloxane is used in waterproof makeup formulations to balance feel.
Ethyl Trisiloxane is used in hair colorants to improve scalp distribution.
Ethyl Trisiloxane is used in liquid soaps for a silky post-wash effect.
Ethyl Trisiloxane is used in creamy concealers for better blendability.
Ethyl Trisiloxane is used in bath oils to reduce greasiness.
Ethyl Trisiloxane is used in hand creams for fast absorption and light touch.
Ethyl Trisiloxane is used in silicone emulsions to enhance skin feel.
Ethyl Trisiloxane is used in body oils to reduce oily residue.
Ethyl Trisiloxane is used in scalp treatments to spread actives evenly.
Ethyl Trisiloxane is used in under-eye treatments for non-tacky feel.
Ethyl Trisiloxane is used in deodorant sticks to facilitate glide.
Ethyl Trisiloxane is used in lotion sprays for better atomization.
Ethyl Trisiloxane is used in illuminating drops for smooth application.
Ethyl Trisiloxane is used in skin tint serums for natural finish.
Ethyl Trisiloxane is used in skin barrier creams to improve tactile quality.
Ethyl Trisiloxane is used in mousse textures for easy distribution.
Ethyl Trisiloxane is used in mattifying primers for silky feel.
Ethyl Trisiloxane is used in gel creams to boost elegance and softness.
Ethyl Trisiloxane is used in exfoliating products to reduce drag.
Ethyl Trisiloxane is used in illuminating creams to aid spread and feel.
Ethyl Trisiloxane is used in anti-frizz hair sprays for even distribution.
Ethyl Trisiloxane is stable under typical formulation conditions and is non-reactive.
Ethyl Trisiloxane is used in skincare, color cosmetics, and haircare formulations as a conditioning agent providing silky smooth skin feel.
Ethyl Trisiloxane is applied to control viscosity and improve spreadability in creams, lotions, serums, and foundations.
Ethyl Trisiloxane is included in spray formulas and light textures to enhance evaporation, reduce tack and provide a clean sensory profile.
Ethyl Trisiloxane helps disperse pigments and inorganic sunscreens evenly in formulations.
Ethyl Trisiloxane contributes to reduced surface tension, improving formulation flow and coverage.
Ethyl Trisiloxane is valued in non-comedogenic products and is well tolerated by sensitive skin types.
DESCRIPTION
Ethyl Trisiloxane is a low molecular weight linear siloxane compound.
Ethyl Trisiloxane is characterized by its ultra-light, volatile nature.
Ethyl Trisiloxane evaporates quickly from the skin, leaving no residue.
Ethyl Trisiloxane improves the sensory feel of emulsions and oil-based systems.
Ethyl Trisiloxane enhances the spreadability of both aqueous and anhydrous formulations.
Ethyl Trisiloxane has excellent compatibility with silicones, esters, and oils.
Ethyl Trisiloxane is clear, colorless, and odorless in appearance.
Ethyl Trisiloxane is widely used in personal care due to its silky afterfeel.
Ethyl Trisiloxane is often included in formulations requiring quick dry-down.
Ethyl Trisiloxane is a volatile, colorless to clear, odorless liquid with fast spreading and dry touch characteristics.
The compound forms a lightweight silicone film on the skin that feels silky and breathable without residue.
Ethyl Trisiloxane evaporates rapidly, is water‑insoluble (water solubility ≈0.007 mg/L), and has a log Kₒₘ greater than 3 indicating high lipophilicity.
Ethyl Trisiloxane is thermally stable (up to ~300 °C), non-oxidizing, and hydrolytically stable under normal formulation pH conditions.
Ethyl Trisiloxane is chemically inert and compatible with common cosmetic surfactants, oils, and polymers.
Ethyl Trisiloxane’s volatility profile makes it ideal for rinse‑off and non-aerosol spray applications with light sensory feel.
PROPERTIES
Chemical Formula: C₉H₂₆O₂Si₃
Molecular Weight: ~250.56 g/mol
Appearance: Clear, colorless liquid
Odor: Minimal to none
Density: ~0.843 g/cm³ at 25 °C
Melting Point: < –60 °C
Boiling Point: ~201 °C at 101 kPa
Flash Point: ~66 °C closed cup (~49 °C per NICNAS)
Vapor Pressure: ~0.45 mmHg at 25 °C
Log Kₒₘ: ~3.8–5.8 indicating high lipophilicity, limited water solubility
Water Solubility: ~0.007 mg/L at 25 °C
Stability: Thermally stable up to 300 °C; non‑oxidizing and hydrolytically stable under normal conditions
Storage Conditions: Store in tightly sealed container, cool, dry, protected from ignition sources and light.
FIRST AID
Inhalation:
Move to fresh air.
Seek medical attention if respiratory symptoms develop.
Skin Contact:
Wash thoroughly with soap and water.
Seek medical advice if irritation arises.
Eye Contact:
Flush eyes with plenty of water for at least 15 minutes.
Seek medical attention if irritation persists.
Ingestion:
Do not induce vomiting.
Rinse mouth and seek medical attention if discomfort occurs.
Note to Physicians:
Treat symptomatically.
Low acute toxicity; no specific antidote known.
HANDLING AND STORAGE
Handling:
Use in well-ventilated environments with appropriate PPE (gloves, goggles).
Avoid inhalation of vapors; ground equipment during transfer of larger volumes.
Prevent static discharge due to volatile flammable nature.
Storage:
Store in cool, well-ventilated area.
Keep containers tightly closed and away from ignition sources.
Protect from high heat and direct sunlight.
Precautions:
Classified as Flammable Liquid Class 3 based on flash point (~49 °C).
Ensure storage and transport per local flammable-liquid regulations.
Dispose as flammable organic solvent waste following environmental guidelines.
