Automotive jounce bumpers (suspension)

Jounce bumpers (also called bump stops or compression bumpers) are automotive suspension components that limit the maximum compression stroke of shock absorbers, absorbing energy in severe impacts (speed bumps, deep potholes, sharp maneuvers) before the damper reaches its physical end-of-stroke. Historically manufactured in rubber or conventional elastomers, jounce bumpers in specialized microcellular PU offer significant advantages: optimized progressive compression curve (soft absorption up to a point, then stiffer), better durability in cycling (millions of cycles), and weight reduction. The global reference technology is BASF's Cellasto, developed specifically for this application. Differentiated applications in premium vehicles where NVH and fine dynamic behavior are demands. Market concentrated in a few manufacturers with proprietary technology.