... seal, main material contains: NR, CR, NBR, SBR, VITON, SILICON, HNBR, etc. Rubber expansion joints provide a wide range ... to damage caused by vibration and movement, each rubber expansion joint protects piping systems by avoiding such hazards. Basic Information ... Application 1). Damp oscillation, noise and vibration 2). Compensate expansion caused by differences in temperature 3). Provide an elastic ...