Rubber cushion principle

The long chain molecular structure of the rubber and the weak secondary force between the molecules make the rubber material exhibit a unique viscoelastic property and thus have good shock absorption, sound insulation and cushioning properties. Rubber components are widely used to isolate vibration and absorb shocks because of their hysteresis, damping, and reversible deformation.
The hysteresis and internal friction characteristics of rubber are usually expressed by the loss factor. The larger the loss factor, the more significant the damping and heat generation of the rubber, and the more obvious the damping effect.
The amount of rubber material loss factor is not only related to the structure of the rubber itself, but also to temperature and frequency. Natural rubber (NR) and butadiene rubber (BR) have lower loss factors at room temperature, styrene-butadiene rubber (SBR), neoprene (CR), ethylene propylene rubber (EPR), urethane rubber (PU) and silicone rubber. The loss factor is centered, with butyl rubber (HR) and nitrile rubber (NBR) having the largest loss factor.