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Dimethyl silicone oil 

 
The viscosity specifications of dimethyl silicone oil in stock are 5cst, 10cst, 20cst, 50cst, 100cst, 200cst, 350cst, 500cst, 1000cst, 2000cst, 3000cst, 5000cst.

 

 

What is dimethyl silicone oil?

Dimethyl silicone oil is a linear polydimethylsiloxane fluid with trimethylsiloxy as the end-capping group. Hexamethyldisiloxane is prepared by hydrolysis and polycondensation of trimethylchlorosilane. Dimethyl mixed ring (DMC) and hexamethyldisiloxane are put into the reaction kettle. Under the action of the catalyst, DMC occurs a Ring-opening polymerization reaction, and under the action of hexamethyldisiloxane end capping, the initial product is obtained. Finally, through a series of complex procedures for removing low-boiling substances, the low-boiling substances in the outcome are removed to obtain silicone oil.

Synonyms: Methyl silicone oil, dimethyl silicone fluid, 201 dimethyl silicone oil, 201 silicone oil, PDMS, polydimethylsiloxane, straight silicone oil, silicone oil, simethicone, Dimethicone, Dimethyl silicone oil 201, Dimethyl silicone

General purpose viscosity
100 cSt silicone oil
350 cSt silicone oil
1000 cSt silicone oil
Medium viscosity
5 cSt
10 cSt
20 cSt
50 cSt
200 cSt
500 cSt
3000 cSt
5000 cSt
High viscosity
10000 cSt
300000 cSt
12500 cSt
30000 cSt
60000 cSt

Chemical structure

The main molecular chain of dimethyl silicone oil consists of alternating silicon and oxygen atoms, and the side chain is connected to methyl groups through silicon atoms. The Si-O-Si bond angle is large, the intermolecular forces of the dimethyl silicone oil molecule are weak, the molecule is in a helical structure, and the organic group (methyl) can rotate freely. Therefore, it has a series of excellent properties, such as hydrophobicity, high compression resistance, lubricity, electrical insulation, softness, spreadability, smoothness, weather resistance, radiation resistance, chemical inertness, high and low-temperature resistance, High flash point and low surface tension.
Dimethyl silicone oil

Physical properties of dimethyl silicone oil


 
 
YNGRUI Number                  Viscosity                      Flash Point(℃)                 Densit（25℃） g/cm3                  Volatile（150℃、3h）%                         Freezing Point(℃)
YR-201-5                               5cst                             160                                   0.934                                              3.0                                                           -65
YR-201-10                             10cst                           160                                   0.935                                              3.0                                                            -65
YR-201-20                             20cst                            210                                  0.95                                                2.0                                                            -65
YR-201-50                             50cst                            270                                  0.95                                                1.0                                                            -55
YR-201-100                           100cst                          310                                  0.97                                                1.0                                                            -50
YR-201-200                            200cst                         315                                  0.97                                                1.0                                                            -50
YR-201-350                            350cst                         310                                  0.97                                                 1.0                                                           -50
YR-201-500                            500cst                         320                                  0.97                                                 1.0                                                           -50
YR-201-1000                          1000cst                       320                                 0.975                                                1.0                                                           -50
YR-201-3000                          3000cst                       320                                 0.975                                                1.0                                                           -50
YR-201-5000                          5000cst                       320                                 0.976                                                1.0                                                           -50
YR-201-10000                        10000cst                     320                                 0.976                                                1.0                                                           -50
YR-201-12500                        12500cst                     320                                 0.977                                                1.0                                                           -50
YR-201-60000                         60000cst                    320                                 0.977                                                1.0                                                           -50

 

Dimethyl silicone oil benefits

The side groups of dimethyl silicone oil are all methyl groups, and the methyl groups are arranged outward and rotate freely around the Si-O bond, which makes dimethyl silicone oil have special properties:
■ Thermal Oxidative Stability: Compared to vegetable oils and mineral oils, dimethicone is very stable in thermal oxidation. Even if the dimethicone oil is continuously heated in the atmospheric environment within 200°C, there will be no obvious change. When heated in rare gas or vacuum, it can withstand more than 300° in a short time, and the main chain Si-O-Si will not be decomposed.
■ Stable viscosity-temperature performance: The force between the methyl silicone oil molecules is very weak, there is no strong polar interaction and the Si-O-Si-bond of the molecular main chain can rotate freely, so the viscosity changes extremely in a wide temperature range are small.
■ Excellent shear resistance: The viscosity of high and low-viscosity dimethyl silicone oil does not change significantly under the action of high shear force. Its shear resistance is more than 20 times that of ordinary mineral oil.
■ Low surface tension: As viscosity increases, the surface tension remains at 20-21mN/m2, which is much lower than that of water (76mN/m2). Low surface tension means higher surface activity. Therefore, it is very easy to spread a film on the surface of the material. It is suitable as water repellent, mold release agent, and defoamer.
■Solubility: Based on the special chemical structure of dimethyl silicone oil, it is a non-polar molecule, easily soluble in non-polar solvents with low solubility (such as carbon tetrachloride, benzene, chloroform, toluene, xylene, dichloromethane , ether, cyclohexane, kerosene, petroleum ether, gasoline, butanone, etc.), insoluble with water or substances containing polar groups.
 

Why use dimethyl silicone oil ?

Dimethyl silicone oil has the most outstanding characteristics, the largest output, and the most widely used variety among many organic silicone oils.
dimethyl silicone oil is generally chemically inert. Due to its unique molecular structure, polymers with different properties can be prepared by introducing side or terminal organic groups to replace part of the methyl group. Let it have hydrophobic, waterproof, hydrophilic, antistatic, antifouling, flexibility, shrink, wrinkle, and so on. For example, dimethyl-emulsified silicone oil is suitable for fabric softening and finishing, it can be used in combination with other additives to improve the smoothness of fabrics and enhance lubricity of fabrics. It is an ideal material for fabric softening and finishing agents.
Silicone emulsion benefits：
■Used as a softener and additive in cosmetic formulations.
■ Used in cars and furniture as a polish, adding gloss.
■ In the leather industry as a softener, waterproofing agent, polishing agent, smoothing agent, brightening agent, etc.
■ In chemical, rubber, paint, paper, food, textile, pharmaceutical, and other industrial production as a defoamer, and lubricant.
■ For silicone rubber, glass products, plastic products, and metal founding as a release agent.

Different viscosities of dimethyl silicone oil use

Experimental oil bath (50CST or 100CST)
Thermal oil (10CST or 50CST)
Pressure gauge silicone oil (1000CST)
High-pressure gas cylinder (1000CST)
Release agent silicone oil (regular viscosity)
Treadmill silicone oil (1000CST)
Maintenance lubricating silicone oil (regular viscosity)
Defoamer silicone oil (regular viscosity)
Silicone rubber dilution (50CST or 100CST)
Pad printing paste to adjust hardness (50CST)
Sewing thread silicone oil (350CST)
Silicone oil for building materials (1000CST)
For cosmetics (above 10000CST)

Why choose Yongrui's dimethyl silicone oil ?

 
 

  • Professional

    12 years experience manufacurer 
    dimethyl silicone oil 

  • OEM/ODM

    All kinds of viscosity of dimethyl silicone oil can be produced
    according to customer requirements.

  • Quality certificate

    Passed ISO9001 certification. That means that we guarantee to provide you with high-quality dimethyl silicone oil.

  • Mass Production​​​​​​​

    Yongrui uses advanced machinery and equipment to produce and provide
    dimethyl silicone oil with stable performance and quality assurance.
HCR silicone
Silicone resins
Liquid silicone rubbers(LSR)
Silicone emulsions
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