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Products and Services
sil500 (electro-technical)


This range encompasses those grades that are suitable for applications requiring enhanced electrical performance. This includes wire and cable products, and insulators.

With outstanding physical and mechanical properties, the wire and cable range also displays exceptional resistance to ageing factors such as oxygen, ozone, humidity and moulds. They can be supplied with a high ash cohesion level if required and low burning toxicity.

Wire & Cable Silicone Rubber

Durometer Hardness (Shore A)50 – 80
Specific Gravity (g/cm3)1.15 – 1.6
Tensile Strength (Mpa)8 – 11
Elongation %200 – 500
Tear Strength (N/mm)15 – 25
Catalyst typeM / E
Colours AvailableYes
Dialectic strength (kV/mm) (2mm thick)20
Volume Resistivity10 15
Dielectric constant at 1MHz2.8 - 4
Oxygen Index (%)30 - 42
Colours available: All

The insulating materials resist combustion arc tracking and environmental degradation. As such, they are ideally suited for use with high voltage and power transmission equipment such as insulators, surge arresters, and casing pipe.

Electrically Insulating Silicone Rubber

Durometer Hardness (Shore A)70 – 80
Specific Gravity (g/cm3)1.5 – 1.6
Tensile Strength (Mpa)5 – 6
Elongation (%)150 – 300
Tear Strength (N/mm)14 – 18
Catalyst typeM / E
Dialectic strength (kV/mm) (2mm thick)20
Oxygen Index (%)35 – 42
Dialectic constant3.3 – 4
Colours available: Grey or White

Download Data Sheet

For information regarding Health and Safety, please refer to the Health and Safety Data Sheet available from health&safety@primasil.com



Primasil Silicones Ltd., Kington Road , Weobley, Herefordshire, HR4 8QU, United Kingdom. tel: +44(0)1544 312600