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Cyclopentasiloxane is a volatile silicone fluid belonging to the cyclic siloxane family and is commonly used to provide fast-drying slip, spreadability, and a silky sensory finish in personal care formulations.
Cyclopentasiloxane is widely used in hair care, skin care, and color cosmetics to improve application feel, reduce tack, and help deliver uniform spreading of oils, silicones, and actives.
Cyclopentasiloxane is valued for very low surface tension, quick evaporation, excellent compatibility with many silicone elastomers and dimethicone blends, and strong sensory enhancement in leave-on and rinse-off products.
CAS Number: 541-02-6
EC Number: 208-764-9
Molecular Formula: C10H30O5Si5
Molecular Weight: 370.77 g/mol
Synonyms: Cyclopentasiloxane, D5, Decamethylcyclopentasiloxane, Cyclomethicone (D5), Cyclomethicone 5, Cyclo-pentasiloxane, Cyclic Siloxane D5, Volatile Silicone Fluid, Decamethyl Cyclopentasiloxane, Silicone Volatile Carrier, D5 Cyclomethicone, Cyclopentasiloxane Silicone, Cyclopentasiloxane, Decamethylcyclopentasiloxane, D5, Cyclomethicone D5, Cyclomethicone 5, Cyclopenta Siloxane, Pentameric Dimethylsiloxane, Cyclopentasiloxane Fluid, Cyclopentasiloxane Cosmetic Grade, Cyclopentasiloxane Personal Care Grade, Cyclopentasiloxane Volatile Silicone, Cyclopentasiloxane Silicone Fluid, Cyclopentasiloxane Volatile Fluid, Cyclopentasiloxane Low Viscosity Silicone, Cyclopentasiloxane Carrier Fluid, Cyclopentasiloxane Emollient, Cyclopentasiloxane Spreading Agent, Cyclopentasiloxane Conditioning Agent, Cyclopentasiloxane Hair Conditioning Silicone, Cyclopentasiloxane Skin Conditioning Silicone, Cyclopentasiloxane Volatile Carrier, Cyclopentasiloxane Silicone Base, Cyclopentasiloxane Clear Fluid, Cyclopentasiloxane Colorless Fluid, Cyclopentasiloxane Odorless Silicone, Cyclopentasiloxane Cosmetic Fluid, Cyclopentasiloxane Silicone Oil, Cyclopentasiloxane Personal Care Fluid, Cyclopentasiloxane Volatile Oil, Cyclopentasiloxane Light Silicone, Cyclopentasiloxane Fast-Evaporating Silicone, Cyclopentasiloxane Siloxane Pentamer, Cyclopentasiloxane Cyclic Siloxane, Cyclopentasiloxane Cyclic Dimethylsiloxane, Cyclopentasiloxane PDMS Cyclic, Cyclopentasiloxane Silicone Pentamer, Cyclopentasiloxane Volatile PDMS, Cyclopentasiloxane Silicone Diluent, Cyclopentasiloxane Formulation Carrier, Cyclopentasiloxane Silicone Vehicle, Cyclopentasiloxane Silicone Emollient, Cyclopentasiloxane Topical Silicone, Cyclopentasiloxane Sensory Modifier, Cyclopentasiloxane Slip Agent, Cyclopentasiloxane Spreadability Enhancer, Cyclopentasiloxane Volatile Emollient, Cyclopentasiloxane Low Surface Tension Silicone, Cyclopentasiloxane Silicone Intermediate
APPLICATIONS
Cyclopentasiloxane is used in hair serums to provide slip, shine, and frizz reduction with a lightweight feel.
Cyclopentasiloxane is incorporated into anti-frizz sprays to improve spreadability and reduce flyaways.
Cyclopentasiloxane is used in hair oils to deliver a silky finish without heavy greasiness.
Cyclopentasiloxane is used in leave-in conditioners to improve combability and reduce wet and dry friction.
Cyclopentasiloxane is incorporated into heat-protection sprays to support even distribution of conditioning agents on hair.
Cyclopentasiloxane is used in smoothing creams to improve brush slip and reduce roughness after styling.
Cyclopentasiloxane is used in styling products to improve application feel and reduce tack during rub-in.
Cyclopentasiloxane is incorporated into hair mousses to improve foam feel and reduce stickiness on drying.
Cyclopentasiloxane is used in hair sprays to support fine misting and a cleaner, less sticky finish.
Cyclopentasiloxane is used in antiperspirant aerosols to improve spray pattern, dry feel, and quick-drying performance.
Cyclopentasiloxane is incorporated into deodorant sprays to enhance slip and reduce wet residue on skin.
Cyclopentasiloxane is used in roll-on deodorants to improve glide and reduce drag during application.
Cyclopentasiloxane is used in body lotions to improve spreadability and provide a silky after-feel.
Cyclopentasiloxane is incorporated into body creams to reduce tack and improve elegance of rich formulations.
Cyclopentasiloxane is used in hand creams to improve rub-in and reduce greasy feel perception.
Cyclopentasiloxane is used in facial moisturizers to improve slip and reduce heaviness in emulsion systems.
Cyclopentasiloxane is incorporated into gel creams to enhance sensory profile and improve quick absorption feel.
Cyclopentasiloxane is used in facial serums to deliver actives evenly and provide a smooth finish.
Cyclopentasiloxane is used in primers to improve slip, blurring feel, and smooth application over skin texture.
Cyclopentasiloxane is incorporated into foundations to improve spread and reduce drag during blending.
Cyclopentasiloxane is used in concealers to improve glide and reduce caking perception.
Cyclopentasiloxane is used in makeup setting products to improve comfort and reduce sticky residue.
Cyclopentasiloxane is incorporated into setting sprays to improve dry-down and reduce tack.
Cyclopentasiloxane is used in powders and hybrid products to improve payoff and reduce patchiness during application.
Cyclopentasiloxane is used in sunscreens to improve spreadability and reduce whitening perception in certain systems.
Cyclopentasiloxane is incorporated into water-resistant sunscreen formats to enhance uniform film formation.
Cyclopentasiloxane is used in after-sun products to improve slip and reduce sticky feel.
Cyclopentasiloxane is used in cleansing oils to improve sensory feel and reduce heavy residue during rinse-off.
Cyclopentasiloxane is incorporated into makeup removers to improve glide and gentle wipe-off performance.
Cyclopentasiloxane is used in rinse-off conditioners to enhance slip and improve wet combing feel.
Cyclopentasiloxane is used as a carrier for silicone elastomers to create blurring and matte-feel gels.
Cyclopentasiloxane is incorporated into anhydrous gel systems to improve spread and quick-dry feel.
Cyclopentasiloxane is used in stick products to improve payoff and reduce drag in wax and polymer matrices.
Cyclopentasiloxane is used in fragrance applications as a volatile carrier in compatible systems to improve dry-down feel.
Cyclopentasiloxane is used in massage products to provide high slip with a lighter finish after evaporation.
Cyclopentasiloxane is used in specialty skin-feel modifiers where fast evaporation and smooth feel are required.
Cyclopentasiloxane is used in industrial and specialty applications as a volatile silicone carrier for lubricity and wetting.
Cyclopentasiloxane is incorporated into surface-treatment products to improve spreading and reduce friction.
Cyclopentasiloxane is used in processing aids where quick evaporation reduces residue after application.
Cyclopentasiloxane is valued in high-sensory formulations because Cyclopentasiloxane delivers fast-drying slip and a silky finish.
Cyclopentasiloxane is selected when a lightweight carrier is needed to distribute silicones, oils, and elastomers uniformly.
Cyclopentasiloxane is used in many premium products because Cyclopentasiloxane improves elegance without heavy after-feel.
DESCRIPTION
Cyclopentasiloxane is typically a clear, colorless, low-viscosity liquid with a light characteristic odor.
Cyclopentasiloxane is a volatile cyclic siloxane composed of five dimethylsiloxane units, commonly referred to as D5.
Cyclopentasiloxane spreads rapidly due to low surface tension and then evaporates, leaving a smooth, dry-feel finish.
Cyclopentasiloxane improves sensory properties by reducing tack, improving slip, and enhancing glide during application.
Cyclopentasiloxane is compatible with many silicone fluids, silicone elastomers, and dimethicone-based blends, enabling a wide range of textures.
Cyclopentasiloxane can help distribute pigments and actives evenly in anhydrous and emulsion systems when properly formulated.
Cyclopentasiloxane has very low water solubility and is generally used in oil or silicone phases rather than water phases.
Cyclopentasiloxane performance depends on formulation type, evaporation conditions, and the presence of compatible silicone and oil components.
Cyclopentasiloxane should be stored properly to maintain purity and to minimize contamination and evaporation losses.
PROPERTIES
Chemical Formula: C10H30O5Si5
Molecular Weight: 370.77 g/mol
Common Name: Cyclopentasiloxane (D5)
Chemical Nature: Volatile cyclic dimethylsiloxane
Appearance: Clear, colorless liquid
Odor: Mild characteristic odor
Solubility: Insoluble in water; soluble in many silicone fluids and compatible oils
Viscosity: Low (typical for D5; grade dependent)
Boiling Point: ~210°C (typical)
Melting Point: ~ -40°C (typical)
Density: ~0.95 g/cm³ (typical; grade dependent)
Flash Point: ~77°C (typical; closed cup, grade dependent)
Vapor Pressure: Relatively high for a silicone fluid; supports volatility (temperature dependent)
Stability: Stable under normal conditions; avoid strong oxidizers and unnecessary high heat
Storage Temperature: 15–30°C, tightly closed, away from heat sources
Shelf Life: Typically 24 months in original sealed packaging (supplier dependent)
FIRST AID
Inhalation:
Move to fresh air if vapors or mists are inhaled.
Seek medical attention if respiratory irritation persists.
Avoid prolonged breathing of concentrated vapors in poorly ventilated areas.
Skin Contact:
Wash with soap and water after contact.
Remove contaminated clothing and wash before reuse.
Seek medical advice if irritation develops or persists.
Eye Contact:
Rinse cautiously with water for several minutes.
Remove contact lenses if present and easy to do, then continue rinsing.
Seek medical attention if irritation persists.
Ingestion:
Rinse mouth with water.
Do not induce vomiting unless directed by medical personnel.
Seek medical attention if a large amount is swallowed or discomfort occurs.
Note to Physicians:
Treat symptomatically.
No specific antidote is required.
Provide supportive care based on exposure route and symptoms.
HANDLING AND STORAGE
Handling:
Use appropriate PPE including gloves and safety glasses.
Avoid generating aerosols or mists during transfer and mixing.
Wash hands after handling and before eating, drinking, or smoking.
Ventilation:
Use local exhaust or general ventilation where vapors may accumulate.
Provide adequate ventilation during spraying, heating, or large-scale mixing.
Avoid prolonged exposure in enclosed areas due to volatile nature.
Storage:
Store in a cool, dry place in tightly closed containers to reduce evaporation losses.
Keep away from heat, sparks, open flames, and strong oxidizers.
Keep containers properly labeled and prevent contamination during repeated opening.
Spill and Leak Procedures:
Contain the spill and absorb with inert material such as sand or universal absorbent.
Clean residue with detergent and water while preventing slip hazards because silicone fluids can be slippery.
Dispose of waste according to local regulations and facility procedures.
Handling Precautions:
Maintain good housekeeping because spills can create significant slip hazards.
Use closed transfer systems when feasible to reduce vapor exposure and evaporation losses.
Rotate stock using FIFO practices to maintain consistent quality and performance.
