and it solidifies into a bushing. This means high volumes of bushings can me made without a huge investment in equipment or machining costs. Polyurethane is also an extremely versatile material. It is used forcontrol arm bushings,sway bar bushings,...
if we talk about the material of the spring, then steel is the best choice. It has tensile properties and does not lose its elasticity; that is why steel makes the best option for springs of the shocks.