JZP-4.2-SC Rubber Shock Absorber: High Damping Ratio and Rapid Energy Dissipation Quick answer: The JZP-4.2-SC is a friction-damping rubber shock absorber that dissipates vibration and shock energy quickly. It carries a nominal load of 4.2 kg, a damping ratio of at least 0.5, and a rubber-metal body that handles combined shear and compression loading. Overview The JZP-4.2-SC is part of the JZP series of rubber isolators built for equipment protection in industrial, laboratory