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General characteristics of silicone rubber

The basic structure of silicone rubber, which is - as in the case of quartz or glass - a combination of silicon and oxygen. "A rigid three-dimensional quartz structure can be avoided thanks to incorporation of alkyl, alkene or aryl groups."

Since rubber is fundamentally different in its structure from other rubber products made of it, their properties also differ significantly from other rubber products.

They are very resistant to high temperatures while maintaining flexibility at very low temperatures. Good electrical and mechanical properties practically do not change over a wide temperature range.

They withstand the effects of oxygen, ozone and weather conditions, including cosmic rays and UV.

Silicone products are known for their excellent insulation properties.

Many of them show physiological indifference, superior to any other currently available elastomers.

Thermal stability

Silicone vulcanized silicone withstand continuous contact with hot air at the temperature of 180 ° C, and even at 250 ° C they remain flexible for several thousand hours. Furthermore, they can withstand short-term exposure to temperatures of 300-400 ° C and even higher.

Combustible properties

Typical combustion temperature of vulcanized silicone as measured in accordance with ASTM-D 1929-1968 standard is about 430 ° C, and the temperature of the combustion-approx. 750 ° C. Insulating silica is what is left after silicone rubber combustion. Therefore, even after the fire insulation of silicone rubber performs its function for some time.

Low temperature flexibility

Generally, vulcanized silicone rubber does not harden and crumble to a temperature of about -55 ° C. Vulcanized silicone of 50 ° -60 ° Shore A hardness withstands even lower temperature, and exhibit superior flexibility. Silicone rubber can be also used in both low and high temperature without any changes in its properties.

Permeability of gases and liquids

Certain physical properties are the result of molecular structure of silicone rubber. Compared to other silicone elastomers, vulcanized silicone rubber is characterized by high permeability for gases and liquids. This permeability depends on conditions in which it is used, such as temperature, pressure change, etc. Generally, the permeability of silicone rubber is about 100 times greater than that of butyl (known for the lowest transmittance possible).

Surface properties

A useful feature of silicone is the size of the vulcanized silicone surface clearly anti-adhesive and hydrophobic. On the other hand, silicone rubber can be vulcanized with metal and glass fibers resulting in very strong combination.

Dielectric properties

Dielectric properties of vulcanized silicone rubber at room temperature is comparable to the best known insulating materials, but silicone rubber is significantly superior to other materials at elevated temperatures (up to 180 ° C), where many of is useless. Excellent arc resistance completes very good dielectric properties of silicone rubber.


If the world seems gray to you, we will try to colour it.
Our products are available in wide range of colours (RAL).

Specialized silicones types for personal use.

  • fluorosilicone
  • electroconductive silicone
  • Oil-resistant silicone

Contact with food


  • Regulation (EC) No 1935/2004 of the European Parliament and the Council of 27 October, 2004 on materials and articles intended to come into contact with food and repealing Directives 80/590/EEC and 89/109/EEC (OJ. EU L 338/4 dated 13 November 2004.)
  • Commission Regulation (EC) No 2023/2006 of 22 December 2006 on good manufacturing practice for materials and articles intended to come into contact with food (Journal of UL 384/75 dated 29.12.2006r.)



"Rubber Articles Intended for Repeated Use", FDA - Code of Federal Regulation, §177.2600