FRP Coil Springs


Sogefi Group has launched the industry’s first coil springs produced with composite material aimed at Passenger Vehicle (PV) and Light Commercial Vehicle (LCV) suspension applications. The FRP Coil Springs are an extremely environmentally friendly innovation: with 40% to 70% less weight they contribute to a real reduction in fuel consumption compared to traditional steel coil springs. In addition, the production FRP Coil Springs is three to five times less energy intensive, at the same time ensuring a drastic reduction in the wastage and use of consumables. The lightweight FRP Coil Springs also allow mass production, whilst delivering real environmental benefits.

The coil springs industry for mass production applications is currently based on steel. Despite some weight reduction during the last 20 years this material has reached its physical limits. Steel’s manufacturing process is also labor intensive with high energy consumption for heat and surface treatment, shot-peening etc. These reasons inspired the Sogefi Group, renowned for its innovative vehicle technologies, to invest in the development of a completely new technology to improve the product and its features: the FRP Coil Spring.

The main principle behind Sogefi´s innovation is to apply the advantages of composite material - based on glass fiber and epoxy resin (FRP) - to automotive coil springs.

Product characteristics:

  • Weight reduction: from 40% to 70% lighter, equivalent to a reduction of 4kg to 6kg per car, which also reduces fuel consumption
  • Higher durability: no oxidation and elimination of corrosion
  • Improved comfort, ride and handling characteristics: better noise reduction on hard surfaces and higher Eigen frequencies
  • Increased safety: eliminating the need risk of sudden breakage