When it is punctured by a sharp object, the internal self-sealing coating will quickly encompass the sharp object to prevent gas leakage,it will restore immediately within 0.05 seconds upon pulling out of the sharp object. The sealing coating will keep constant from low temprature-40°C to high temprature 170°C , which can effectively solve the problem of air leakage caused by the puncture of the tire with a sharp object.