Silicone fluid properties-Silicone oil - Wikipedia

Silicone fluid is extremely stable against thermal oxidation. Silicone fluid has excellent low-temperature resistance. Since temperature has little effect on viscosity, these products are ideal for applications in cold regions. Silicone fluid shows little change in viscosity due to changes in temperature. It is thus ideal for use as instrument oil in instruments used in airplanes, automobiles, and trains, and for other applications that make use of silicone fluid's viscous properties.

Silicone fluid properties

Silicone fluid properties

Silicone fluid properties

Note that this is not due to destruction of the molecules, so the viscosity returns to the propertkes level when the shear stress Silicone fluid properties removed. Releasability and Nonadhesiveness. Silicone oil is also one of the two main ingredients in Silly Puttyalong with boric acid. The permanent viscosity change results from the molecules being torn apart by the mechanical fluic. Silicone fluid has much higher compressibility than petroleum-based insulating oils or synthetic lubricants, and is thus well-suited for use as damper Silicone fluid properties.

Bathroom vintage milk glass. Silicones: Unique Chemical Structure

At the same time, the organic groups bound to the silicon pave the way for a diverse range of modifications. Properties and Applications Chemical Definition Remarkably Stable The backbone of silicones is based on an Si-O bond, whose stability Silicone fluid properties exceeds that of the C-C bonds of organic compounds. Oily, viscous, opaque or slightly cloudy liquids They are mostly used in systems containing little or no water Compounds can be used neat or mixed Silicond suitable formulation components such as surfactants. Plus, it is permanently elastic, easy to clean Silicone fluid properties more importantly neutral in terms of odor and taste. As hydrophobizing additives, silicone emulsions protect textiles or building and insulation materials pro;erties water and damp. Particular silicone compounds, cyclic siloxanes D4 and D5, are air and water pollutants and have negative health effects on test animals. Namespaces Article Talk. They are water-resistant, water-repellent and oxidation-resistant. They are mostly used Christy victims of tentacles systems containing little or no water. This affords a way of transforming hydrophobic silicone fluids into more or less hydrophilic molecules. These are responsible for silicones' semi-organic nature. Polydimethylsiloxane is often used for this purpose, since its specific crosslinking results in a flexible and soft silicone with high durability and tack.

Silicone Oil in Vitreoretinal Surgery pp Cite as.

  • We encounter silicones every day without noticing them.
  • Share facts or photos of intriguing scientific phenomena.
  • A silicone oil is any liquid polymerized siloxane with organic side chains.
  • Silicones are particularly stable and exceptionally resistant to such influences as heat and electromagnetic radiation.
  • Silicone fluid is extremely stable against thermal oxidation.

In chemical structure, dimethyl silicone fluids are quite different from all other fluids. See sample structures at the bottom of this page. This chemical structure gives silicone fluids a profile of properties, which permits them to perform in applications where other fluids would not be suitable. Some of the outstanding properties shared by most silicone fluids are;.

All of these properties are found in the basic family of dimethyl silicone fluids, which are available in a wide range of viscosities. Clearco Silicones offers a complete line of silicone fluids in a wide viscosity range to provide maximum latitude in selecting the specific silicone fluid to meet the requirements of a particular industrial, military or consumer application.

While it is difficult to recommend the use of any one fluid for an application, this publication lists various applications and indicates the Clearco silicone fluids most frequently used. Generally speaking, it is best to evaluate several possible silicone fluids to determine which will provide the optimum performance in an application. Listed below are descriptions of the commonly used Clearco silicone fluids with examples of the types of applications for which the fluids are designed.

Introduction to Silicone Fluids. Silicones: Unique Chemical Structure In chemical structure, dimethyl silicone fluids are quite different from all other fluids.

Wide Temperature Range: Low temperature limits and high temperature capabilities of silicone fluids far surpass those of conventional fluids. Thermal Stability: Silicone fluids show excellent stability when exposed to high temperatures for extended periods of time. See also 16 below Thermal Conductivity: The thermal conductivity of silicone fluids over a wide temperature range is comparable to hydrocarbon fluids.

Chemical Inertness: Silicone fluids are chemically inert to most common materials of construction. Low Surface Tension Silicone fluids have unusually low surface tensions, which help provide easy and efficient spreading, high surface activity and low internal cohesive energies. Lower viscosities provide lower surface tensions than higher viscosities. Compressibility: Silicone fluids of 10 centistokes or more exhibit compressibility of 1.

Lower viscosities exhibit higher compressibility than higher viscosities. Low Surface Tension: Silicone fluids have unusually low surface tensions, which help provide easy and efficient spreading, high surface activity and low internal cohesive energies. Shear Stability: Silicone fluids have unusually high resistance to breakdown by mechanical shearing.

The shear stability of silicone fluids can be as much as twenty times that of quality petroleum oils, providing longer life at higher speeds and loadings. Shear Characteristics: The viscosity of a fluid is defined as the ratio of shear stress to shear rate. In the ideal, or Newtonian fluid, this ratio is constant and is independent of the shear rate.

The dimethyl fluids Pure Silicone Fluids approach Newtonian behavior. The lower the viscosity, the more nearly Newtonian the fluid.

Many organic fluids show a drop in nominal viscosity after prolonged shearing action. This is a permanent loss in viscosity resulting from poor shear stability and is different from the recoverable drop in viscosity demonstrated by silicone fluids.

The permanent viscosity change results from the molecules being torn apart by the mechanical action. Silicones show extremely good shear stability and retain their original viscosity characteristics as they are not affected by mechanical working Dielectric Properties: Electrical grade silicone fluids offer excellent dielectric properties, which are maintained for prolonged periods, even under adverse operating conditions. Because of the basic properties of silicone fluids, these electrical properties are maintained for prolonged periods and under adverse operating conditions.

At very high temperatures, the loss in simple volatiles is compounded by some oxidative effects. Specific Heat: Specific heat of most silicone fluids falls in the 0. Oxidation Stability: The oxidation stability of silicone fluids is excellent. In the presence of air, oxidation stability becomes an important factor in the high temperature performance of silicone fluids.

The reaction is dependent on the temperature and supply of air. Below this temperature, some oxidation will occur which will not adversely affect the useful life of the silicone fluids. The following table compares the Oxidation Threshold of several silicone and organic fluids. This information is offered for comparison purposes only with the suggestion that user perform his own appropriate tests.

Since there are only very weak intermolecular forces between the individual methylsilicone chains, they have a liquid consistency over wide ranges of their molecular weight. Chemical Reactions in Everyday Life. These silicon atoms are tetravalent. An overview of this is provided by the following table:. Silicone Antifoam Powders These are ideal for use in powder products, such as powder-form detergents.

Silicone fluid properties

Silicone fluid properties

Silicone fluid properties

Silicone fluid properties. A World of Unlimited Possibilities

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Silicone fluid is extremely stable against thermal oxidation. Silicone fluid has excellent low-temperature resistance. Since temperature has little effect on viscosity, these products are ideal for applications in cold regions.

Silicone fluid shows little change in viscosity due to changes in temperature. It is thus ideal for use as instrument oil in instruments used in airplanes, automobiles, and trains, and for other applications that make use of silicone fluid's viscous properties. The specific heat of silicone fluid varies somewhat depending on viscosity, but is generally about one-third that of water.

The values are comparable to common organic compounds that have low specific heat. However, viscosity increases and gelation can occur if even trace amounts of acids or alkalis are introduced at high temperatures. Silicone fluid is almost unaffected by the presence of aluminum, stainless steel, and most other metals. However, lead, selenium, and tellurium can cause gelation. Precautions must therefore be taken during handling. Silicone fluid has no adverse effect on metals, nor on most other substances.

However, it may reduce the volume and weight of some rubber and plastic compounds due to extraction of the plasticizers when subjected to high temperatures. This tendency is especially strong for low-viscosity fluids. Particular care must be exercised when silicone fluid comes into contact with rubber sealing materials. The surface tension of silicone fluid is much lower than that of water or common synthetic oils. Silicone fluids spread easily over the surfaces of various substances, and are thus widely used as release agents, defoamers, and ingredients for cosmetics.

The application of silicone fluid to mold surfaces prevents the adhesion of other materials, thereby enhancing mold releasability. Silicone fluids are widely used as release agents because they have excellent heat resistance and do not contaminate molds or molded materials. Added in small amounts, silicone fluid has excellent defoaming action. Silicone fluid is primarily used as a defoamer for oil-based foaming fluids.

Silicone fluid also has excellent water repellency. Silicone fluid can also be used to improve the fluidity of powders and prevent coagulation. Generally speaking, silicone fluid is physiologically inert and poses almost no risk to people or animals. It is thus widely used as an ingredient in cosmetics and pharmaceuticals.

The electrical properties of silicone fluid are extremely stable with respect to variations in temperature and frequency. Silicone fluid also withstands dielectric breakdown better than mineral oil. However, as with ordinary insulating oils, moisture absorption affects the electrical insulation properties of silicone fluid, so care must be taken to limit contact with moisture.

Steps should be taken to dehydrate silicone fluid before using it as insulating oil in high-voltage transformers. Silicone fluid has extremely high shear resistance, and it resists shear degradation at high speeds and high loads, meaning it has a long operating life. When synthetic or mineral oils pass through narrow gaps under pressure, shear stress destroys the oil molecules, causing a drop in viscosity. However, with high-viscosity products there may be an apparent drop in viscosity depending on the shear velocity.

Note that this is not due to destruction of the molecules, so the viscosity returns to the initial level when the shear stress is removed. The shear resistance of silicone fluids is over 20 times greater than that of even top-quality petroleum-based oils.

Unlike mineral oil, silicone fluid exhibits extremely high compressibility and does not coagulate when pressurized. Silicone fluid has much higher compressibility than petroleum-based insulating oils or synthetic lubricants, and is thus well-suited for use as damper oil.

Silicone fluid is highly soluble in hydrocarbon solvents such as toluene, xylene, ligroin, and mineral spirits as well as in chlorinated hydrocarbons. However, it is insoluble in ethanol, methanol, and water. Although silicone fluid has many advantageous properties eg. However, silicone fluid does provide good lubrication for steel-bronze, steel-aluminum, steel-zinc, and wood-wood interfaces and for various combinations of plastics.

In terms of radiation resistance, methylphenyl silicone fluid is superior to dimethyl silicone fluid, and the stability of radiation resistance increases proportionately with the amount of phenyl groups present in the molecules. Due to this property and its resistance to high and low temperatures, methylphenyl silicone fluid is widely used in the high-temperature parts of radiological equipment. Heat Resistance. Low-Temperature Resistance. Viscosity Stability Silicone fluid shows little change in viscosity due to changes in temperature.

Specific Heat The specific heat of silicone fluid varies somewhat depending on viscosity, but is generally about one-third that of water. Corrosivity and Effects on Other Materials.

Surface Tension. Releasability and Nonadhesiveness. Defoaming properties. Water Repellency. Physiological Effects Generally speaking, silicone fluid is physiologically inert and poses almost no risk to people or animals.

Results of various safety tests. Electrical Properties The electrical properties of silicone fluid are extremely stable with respect to variations in temperature and frequency. Arc resistance. Resistance to Shear Stress Silicone fluid has extremely high shear resistance, and it resists shear degradation at high speeds and high loads, meaning it has a long operating life. Compressibility Unlike mineral oil, silicone fluid exhibits extremely high compressibility and does not coagulate when pressurized.

Solubility Silicone fluid is highly soluble in hydrocarbon solvents such as toluene, xylene, ligroin, and mineral spirits as well as in chlorinated hydrocarbons. Lubricity Although silicone fluid has many advantageous properties eg.

Radiation Resistance In terms of radiation resistance, methylphenyl silicone fluid is superior to dimethyl silicone fluid, and the stability of radiation resistance increases proportionately with the amount of phenyl groups present in the molecules.

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Silicone fluid properties