Self-lubricating LSR - reliable sealing with easy assembly

摘要

Over the last decades, the number of electrical systems in cars has significantly increased. While electrical side-windows, airbags, and air-conditioning were perceived as luxury in the 1980s, they are now pretty much accepted as standard items in vehicles. In order to meet new and stricter emission standards, additional secondary systems, such as sensors and control units are required to improve engine efficiency. All these secondary devices require electrical connections. These connectors have to be able to operate at a wide temperature range and to resist moisture and various automotive under the hood fluids. The performance of modern cars nowadays depends on the seal of the electrical connections. Silicone elastomers can cover a wider range of properties needed for this application compared to other elastomer materials. The silicone materials of choice are self-lubricating to enable ease of assembly of the electrical contacts attached to the cables. For more than 30 years, silicones, especially liquid silicone rubbers (LSRs), have been successfully used in this segment based on their excellent properties and their suitability for mass production. This paper will explain basics of LSR and self-lubricating technology based on an existing broad portfolio of grades. Recent material advancements to meet more demanding applications and specifications are also discussed.