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Plastics & Elastomers
The material selection platform
Plastics & Elastomers
by SpecialChem
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Silopren™ Electro 641 JP

Silopren™ Electro 641 JP by Momentive Performance Materials is a two-component liquid silicone rubber. It is not readily combustible and it does not melt or drip. It is easily pigmented with LSR color pastes. Offers fast hydrophobicity transfer, hydrophobicity recovery, rapid vulcanization, excellent flowability and excellent dielectric behaviour over a wide range of temperature. Exhibits outstanding resistance to aging, weather, arc and tracking. Possesses high stability, flexibility at low temperature, excellent stability to ozone and UV light. Designed for processing by injection molding. Silopren™ Electro 641 JP is developed for the manufacturing of housing & weather sheds, hollow core insulators, cable accessories, high voltage plugs, cable connectors, fittings & terminals, suspension & long rod insulators, post line & pin insulators and surge arresters.
Product Type
Silicone Rubber
Physical Form

Silopren™ Electro 641 JP Properties

Mechanical Properties

Value & Unit
Test Condition
Test Method
Tensile Strength
> 6.0 N/mm2
(Vulcanization: 10 min at 175°C)
DIN 53 504 S2
Durometer Hardness (Shore)
35 - 45
(Vulcanization: 10 min at 175°C)
DIN 53 505
Tensile Elongation
> 450 %
(at Break, Vulcanization: 10 min at 175°C)
DIN 53 504 S2

Silopren™ Electro 641 JP Processing Guidelines

Injection Molding Properties

Value & Unit
Test Condition
Test Method
Mold Temperature
100 - 130 °C
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