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Silicone for Aerospace BS F 152 and BS F 153 - January 2017

Clwyd have developed silicone compounds to meet Aerospace specifications BS F 152 and BS F 153. BS...read more
Material Selection >> Compound Type Selector

Compound Type Selector...

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The polymer used to make the compound will be the major determinant of its properties. The selector enables you either to compare properties of rubber compounds which are commonly used in your industry, or to select compounds with particular properties.

Rubber compounds stiffen at low temperatures, and undergo thermo-oxidative & thermal degradation at high ones; even when a compound has good stability at elevated temperatures in air, it often performs differently in the absence of air.  It is vital that the likely service conditions fall within the temperature range in air stated for a particular polymer; if temperatures may occasionally exceed the given range or there could be exposure to elevated temperatures in an anaerobic atmosphere, specific advice should be obtained from our technical support team.

Similarly, the compound hardness range achievable will depend on the extent to which fillers and oils can be incorporated into a given polymer; as can be seen from the table, this may be an issue where particularly soft or hard compounds are required. 

Resistance to chemicals is also primarily dependent on polymer type- if a component is to be immersed in a particular  fluid, a top rating for fluid resistance would generally be required, if exposure will be more limited,  a lower rating may be acceptable.

Physical properties are also strongly influenced by other ingredients of the compound, but the inherent properties of the polymer will still be an important factor. It must be noted that data given in the table is for testing conducted at 23ºC and that all elastomers will give a lower tensile strength and elongation to break when tested at higher temperatures. If it is critical that the component to be made from a compound has a certain strength at a high operating temperature, it will be necessary to select a compound with sufficient strength at 23ºC to compensate for this predicted drop (see datasheet for 9T72M030 as example). Specialist advice may be needed.

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Material Selection >> Compound Type Selector
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