Spark plug rubber is primarily used for insulation and sealing, protecting internal electrodes and preventing electrical leakage. The rubber material offers high-temperature and oil resistance that enable to operation stably in the high-temperature and high-pressure environment. It is suitable for agricultural machinery such as mowers and harvesters. By reducing vibration damage and oil infiltration, rubber enhances the lifespan and ignition efficiency of spark plugs, making it a critical component for the reliable operation of agricultural equipment.