... electrical insulation 2. low cost and waterproof 3. long service life 4. stable performance 5. low cost JHX series rubber spring for ... be used in the vibrating equipment, power car, car and so on. Comparing with the steel spring it has the obvious strong ... life, low cost and good cold tolerance, air tightness, waterproof, electrical insulativity, and it is the best choice for reducing vibration ...