Silicone Oil, Polydimethylsiloxane oil

Silicone oil in the form of polydimethylsiloxanes without active/crosslinking components is a base product for many polycondensation silicones. Please note: if the quality of the oil is not explicitly mentioned, we supply industrial quality. If you are interested in food-safe, pharmaceutical or medically suitable silicone oil, you can of course...

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Silicone oil in the form of polydimethylsiloxanes without active/crosslinking components is a base product for many polycondensation silicones.

Please note: if the quality of the oil is not explicitly mentioned, we supply industrial quality. If you are interested in food-safe, pharmaceutical or medically suitable silicone oil, you can of course contact us.

The oil is used to make the silicone more fluid, softer, more flexible and more elastic.

This can be used in both polycondensation silicones and addition silicones.

Because oil is not cross-linked in the silicone elastomer, it can migrate to the surface over time and under mechanical stress. This means that the silicone loses mass and shrinkage can occur.

Silicone oils are not extracted from petroleum, but made from silicon, the most abundant element in the earth's crust.

Silicone oil has many desirable properties:

✔ Minimal change in physical properties over a wide temperature range
✔ excellent water-repellent properties
✔ good dielectric properties
✔ low surface tension and thus high surface activity chemically very reactive
✔ low pour point
✔ good solubility in a wide range of solvents

Silicone oil is fairly stable over a wide temperature range.

Here is a graph of the dependence of the viscosity (the viscosity) versus the temperature of silicone oil

Viscositeit in cSt van siliconen olie tegen Temperatuur in oC


Here is an overview of average properties of silicone oil per available viscosity

Heat baths / heat transfer silicone oil

Silicone oil can be used as a fluid in heat exchange baths/pumps. Please note the following 2 things:

1) Choose an oil that is fluid enough for the application, but especially with a flash point well above the desired application temperature

2) Remember that regular silicone oil can withstand higher temperatures, but not for too long! If you are going to work continuously at higher temperatures for longer periods, we strongly recommend using phenyl modified silicone oil. This is much more stable under elevated temperatures.

Expansion coefficient

While we do not have measurements of the exact coefficient of expansion for silicones of different viscosities versus temperature, this general formula should give you an idea of what to expect:

γ=1/V ∂V/∂T

whereby:

  • γ (gamma) is the cubic expansion coefficient (in K^{-1})
  • V is the volume (in m3)
  • T is the temperature (in K)

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