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CAS Number: 63148-62-9 (polydimethylsiloxane)
Synonyms: Polydimethylsiloxane (PDMS); Dimethyl polysiloxane; Dimethicone; Dimethyl silicone fluid; Silicone oil (5000 cSt); Dimethylsiloxane polymer; Siloxane, dimethyl, homopolymer
Chemical Identity and Properties:
Dimethicone 5000 is a specific grade of polydimethylsiloxane (PDMS), a silicone-based polymer characterized by a repeating backbone of silicon-oxygen bonds with methyl groups attached to the silicon atoms. The general molecular formula is (C₂H₆OSi)ₙ, with n representing the degree of polymerization. The "5000" designation refers to the kinematic viscosity, which is approximately 5000 centistokes (cSt) at 25°C. This viscosity corresponds to a molecular weight in the range of approximately 70,000–100,000 g/mol, depending on the polymer's molecular weight distribution.
Physical Properties:
Appearance: Clear, colorless, odorless liquid
Viscosity: 5000 cSt (±10% typical specification) at 25°C
Density: Approximately 0.97–0.98 g/cm³ at 25°C
Refractive Index: Approximately 1.403
Surface Tension: Approximately 21 mN/m (very low)
Flash Point: >300°C (open cup)
Pour Point: Approximately -40°C
Thermal Stability: Stable up to approximately 200°C; above this temperature, gradual degradation occurs
Dimethicone 5000 is insoluble in water, alcohols, and polar solvents but soluble in aliphatic and aromatic hydrocarbons, chlorinated solvents, and silicone fluids of lower viscosity. It exhibits excellent shear stability, oxidative stability, and a low surface tension, contributing to its spreading and lubricating properties.
Applications:
Personal Care and Cosmetics: Dimethicone 5000 is widely used in hair care products (shampoos, conditioners, styling products) where it provides smoothness, shine, and detangling benefits without a heavy or greasy feel. In skin care (lotions, creams, sunscreens), it functions as a skin protectant, emollient, and film former, imparting a silky, non-occlusive feel. In color cosmetics (foundations, primers), it improves spreadability, enhances wear time, and provides a smooth application surface.
Industrial Lubricants: Used as a high-temperature lubricant, damping fluid, and release agent in applications requiring stable viscosity across wide temperature ranges.
Antifoaming Agent: Effective as a defoamer in industrial processes including wastewater treatment, fermentation, food processing, and chemical manufacturing.
Plastics and Rubber Processing: Acts as a mold release agent and lubricant in the processing of rubber, plastics, and composites.
Textile and Fiber Processing: Applied as a fiber lubricant and softening agent to improve processing characteristics and fabric hand.
Regulatory Status:
Dimethicone is generally recognized as safe (GRAS) by the FDA for certain food contact applications and is permitted in over-the-counter (OTC) skin protectant products at concentrations up to 30%. It is widely accepted in cosmetic regulations globally, including under the EU Cosmetics Regulation and the FDA monograph for skin protectants.
SAFETY INFORMATION ABOUT DIMETHICONE 5000
First aid measures:
Description of first aid measures:
General advice:
Consult a physician.
Show this safety data sheet to the doctor in attendance.
Move out of dangerous area:
If inhaled:
If breathed in, move person into fresh air.
If not breathing, give artificial respiration.
Consult a physician.
In case of skin contact:
Take off contaminated clothing and shoes immediately.
Wash off with soap and plenty of water.
Consult a physician.
In case of eye contact:
Rinse thoroughly with plenty of water for at least 15 minutes and consult a physician.
Continue rinsing eyes during transport to hospital.
If swallowed:
Do NOT induce vomiting.
Never give anything by mouth to an unconscious person.
Rinse mouth with water.
Consult a physician.
Firefighting measures:
Extinguishing media:
Suitable extinguishing media:
Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Special hazards arising from the substance or mixture
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas
Advice for firefighters:
Wear self-contained breathing apparatus for firefighting if necessary.
Accidental release measures:
Personal precautions, protective equipment and emergency procedures
Use personal protective equipment.
Avoid breathing vapours, mist or gas.
Evacuate personnel to safe areas.
Environmental precautions:
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
Methods and materials for containment and cleaning up:
Soak up with inert absorbent material and dispose of as hazardous waste.
Keep in suitable, closed containers for disposal.
Handling and storage:
Precautions for safe handling:
Avoid inhalation of vapour or mist.
Conditions for safe storage, including any incompatibilities:
Keep container tightly closed in a dry and well-ventilated place.
Containers which are opened must be carefully resealed and kept upright to prevent leakage.
Storage class (TRGS 510): 8A: Combustible, corrosive hazardous materials
Exposure controls/personal protection:
Control parameters:
Components with workplace control parameters
Contains no substances with occupational exposure limit values.
Exposure controls:
Appropriate engineering controls:
Handle in accordance with good industrial hygiene and safety practice.
Wash hands before breaks and at the end of workday.
Personal protective equipment:
Eye/face protection:
Tightly fitting safety goggles.
Faceshield (8-inch minimum).
Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).
Skin protection:
Handle with gloves.
Gloves must be inspected prior to use.
Use proper glove
removal technique (without touching glove's outer surface) to avoid skin contact with this product.
Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices.
Wash and dry hands.
Full contact:
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
Splash contact
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
It should not be construed as offering an approval for any specific use scenario.
Body Protection:
Complete suit protecting against chemicals, The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace.
Respiratory protection:
Where risk assessment shows air-purifying respirators are appropriate use a fullface respirator with multi-purpose combination (US) or type ABEK (EN 14387) respirator cartridges as a backup to engineering controls.
If the respirator is the sole means of protection, use a full-face supplied air respirator.
Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU).
Control of environmental exposure
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
Stability and reactivity:
Chemical stability:
Stable under recommended storage conditions.
Incompatible materials:
Strong oxidizing agents:
Hazardous decomposition products:
Hazardous decomposition products formed under fire conditions.
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas.
Disposal considerations:
Waste treatment methods:
Product:
Offer surplus and non-recyclable solutions to a licensed disposal company.
Contact a licensed professional waste disposal service to dispose of this material.
Contaminated packaging:
Dispose of as unused product
