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Silopren* LSR 2725/40 liquid silicone rubber

Self bonding – Self-lubrication

Silopren LSR 2725/40 is a two-component liquid silicone rubber for injection molding, which offers robust primer-less adhesion to a wide range of substrates including PBT but without adhesion to the mold. Additionally, Silopren LSR 2725/40 is self-lubricating. The product allows design and manufacturing of composite parts where the seal assembly is replaced by a direct overmolding of the plastic substrate. The adhesion keeps the seal in place and the lubrication reduces assembly forces. This material is an excellent candidate to consider for the manufacture of elastomeric articles requiring self-lubricating properties like seals for electrical connectors in the automotive industry.

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More About Silopren* LSR 2725/40 liquid silicone rubber

System integration, cost-saving considerations and increased focus on reliability pushes development of composite hard-soft combinations. Self-bonding LSRs like Silopren LSR 2740 are frequently used in automotive, consumer or E/E applications.

The initial bond strength allows for demolding, however full bond strength is reached after some storage at room temperature. Additionally, Silopren LSR 2725/40 is self-lubricating. The self-lubricating effect is achieved by a fluid which exudes out of the vulcanizate over an extended period of time. It typically starts between a few hours and one day after vulcanization. The material has a whitish appearance and can be easily pigmented with LSR color-pastes available from Momentive.

This combination of features makes Silopren LSR 2725/40 liquid silicone rubber ideal for cost-efficient injection molding of hard-soft-combinations with integrated and lubricated sealing. Target applications are connectors, boxes and housings in the automotive industry.

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