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63148-62-9
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63148-62-9
Silicone oil, also known as polydimethylsiloxane (PDMS), is a linear polysiloxane liquid formed by the hydrolysis and condensation of organosilicon monomers (dimethyldichlorosilane). It is the most produced product in the organosilicon industry, usually written with the structural formulae:
Polydimethylsiloxane (CAS No. : 63148-62-9) (CH3)3SiO-[Si(CH3)2O]n-Si(CH3)3
It is a colorless, odorless and transparent liquid at room temperature, has an extremely wide viscosity range (from a light liquid of 0.65cSt to highly viscous liquid of millions of cSt), temperature resistance range of about -50℃ to above 200℃, low surface tension, chemical stability, physiological inertness, excellent electrical insulation, and the change of viscosity with temperature is very small. Non-industrial grade products are typically low viscosity or refined to specific viscosities and with the required higher purity.
The backbone of silicone oil is an arrangement of alternating silicon-oxygen (Si-O) bonds with methyl (-CH3) side groups attached to the silicon atoms, as far as molecular arrangement is concerned. The high bond energy and free rotation of Si-O bonds result in excellent thermal stability and a wide operating temperature range for silicone oil. The methyl side groups are directed outwards to give a “umbrella-like” barrier layer, giving very low surface tension and high hydrophobicity. In cosmetics it provides a smooth skin feel and film-forming moisturizing properties and in food it provides safe anti-foaming properties.
Because of its chemical inertness, silicone oil does not react with most chemicals and is resistant to oxidation and high temperatures. It is non-toxic, non-irritant to the skin and physiologically inert and is non-flammable or flame-retardant. Store in a cool, dry place, away from heat.
Non-industrial grade silicone oil refers to those products that are manufactured for use in cosmetics, food and scientific research. These products are typically available in cosmetic grade, food grade and reagent grade specifications. Compared to industrial grade, non-industrial grade products focus more on the following indicators:
Viscosity
Viscosity determines the skin feel, film-forming properties, and flowability of a product. Cosmetic grade products commonly use low viscosity specifications of 5-100 cSt, and different viscosities are selected for different applications.
Low cyclic content (D4, D5, D6)
Cyclosiloxanes (D4, D5, D6) are impurities of concern in cosmetic regulations. Cosmetic-grade products must control the content of cyclic compounds to a low level to meet regulatory requirements.
Heavy metal limits
Cosmetic-grade and food-grade products have strict limits on harmful impurities such as heavy metals, which are key indicators for ensuring safety.
acid value
Acid value reflects the content of free acid, which affects product stability and safety in contact with skin and food, and must be strictly controlled.
Color and transparency
The product must be colorless, transparent, and free of mechanical impurities. Color and transparency are important references for the quality of cosmetic and food-grade products.
1. Cosmetics and Personal Care (Cosmetic Grade, Core Application)
( 1 ) Silicone oil is a classic ingredient in shampoos, conditioners, skin care products, sunscreens and makeup. It is smooth to the touch, forms a moisturizing film, protects against UV rays and gives a refreshing non-oily sensation. It is one of the most used oily raw materials in cosmetic formulations.
( 2 ) Baby lotion, diaper rash cream and mild cleaners use silicone oil. Its physiological inertness and mildness have made it a common ingredient in formulas for maternal and infant care. It might be in the care products we use for our babies.
2. Processing of food (quality of food)
Polydimethylsiloxane is an anti-foaming agent . Food grade polydimethylsiloxane can be used in edible oils . It is also used in defoaming, demolding and lubrication of food processing machinery to help prevent oil splattering and improve processing operations. It should be used according to the stipulations of GB 2760.
3. Release agent (for cores)
Silicone oil is the most popular release agent in plastics, rubber, metal die casting and glass fiber molding. It is widely used in the injection molding, extrusion, die casting and composite material molding process, taking advantage of its low surface tension and non-adhesive properties, which helps to smoothly release the products from the mold.
4. Defoamer
The active ingredient in industrial defoamers is silicon oil. It has a low surface tension and can quickly break bubbles, and it is widely used in defoaming processes in industries such as food, papermaking, water treatment, detergents, sugar refining, fermentation, coatings, textile printing and dyeing, drilling and oil refining.
5. High grade lubricants and damping fluids
Silicone oil is a lubricant of high grade for precision machinery, bearings, instruments and food processing machinery. It is also used as an anti-vibration oil (damping fluid) in shock absorbers, instrument damping and buffer devices, thanks to its wide temperature range and stable viscosity.
6. Electronic Applications and Electrical Insulation
Silicone oil has good electrical insulating properties and is used as transformer oil, capacitor insulating oil and insulating medium for electronic components. It is also used as a base oil for thermal grease and electronic potting material for the electrical and electronics industries.
7. Textile Finishing and Surface Modification
Amino silicone oil, hydroxyl silicone oil and the like are textile softeners, water repellents and fiber lubricants that give softness, smoothness and water repellency to the fabric. They are also used for surface treatment of leather and paper .
8. Oils for vacuum pumps and special oils
Silicone oil is the vacuum diffusion pump oil and reaches the high vacuum levels in high vacuum equipment due to its low vapor pressure and thermal stability. It is also used as hydraulic oil and instrument oil for special working condition.
9. Household goods and cars (indirect contact)
Silicone oil is used in car tire polish, polishing wax, shock absorber fluid, sealing lubrication. We might also be using it indirectly when we wax our cars or use household care products.
10. Scientific Research and Laboratory Use (Reagent Grade)
Laboratory silicone oil baths use silicone oil as the heating medium (high boiling point, stable). It is also a popular material for research related to microfluidic chips, soft lithography and flexible electronics (PDMS) and is an essential consumable in scientific research laboratories.
11. Material Development and Custom Synthesis
Functional derivatives such as amino silicone oil, hydroxyl silicone oil etc. can be prepared with silicone oil. It is also a basic raw material for the research and development of materials such as silicone rubber and silicone resin, which are used in the research and development of new materials and fine chemicals.
12. Other Uses
As organosilicon materials develop, the application scope of non-industrial grade silicone oil continues to broaden, such as pet care, musical instrument and collectibles maintenance, and anti-fog eyeglasses.
Non-industrial grade specifications should be noted as not being “risk-free”: Although silicone oil is physiologically inert, cosmetic and food grade silicone oil must be used to meet the corresponding standards and cannot be mixed; industrial grade silicone oil is strictly prohibited from use in cosmetics and food; waste silicone oil must be disposed of in accordance with regulations.
Silicone oil (polydimethylsiloxane, PDMS, CAS No. 63148-62-9) is a colorless, odorless, linear polysiloxane liquid with a very broad viscosity range. It has a wide temperature range, low surface tension, chemical inertness and physiological inertness with the Si-O backbone and methyl side groups, and is an important functional fluid in the daily chemical, food and scientific research fields. It is present in our everyday life in cosmetics and hair care products, in food and cooking, in maternal and infant care, in scientific research laboratories, and in industrial supply chains. Refined cosmetic-grade, food-grade and reagent-grade silicone oils are widely used in non-industrial applications such as personal care products, edible oil antifoaming agents, ointment bases, laboratory silicone oil baths and microfluidic research, and custom synthesis. They are a gentle functional fluid bridging “organosilicon chemistry” with “beauty, health and scientific research”.ch."
