The heat resistance properties of the vulcanized rubber was measured after heating at 150 8C for 70 h. Oil resistance was measured after immersing in ASTM No. 3 at 150 8C for 70 h. Fuel resistance was measured after immersing in FUEL D (isooctane (4):toluene (6)) at a room temperature for 70 hr. in terms of its hardness, tensile characteristics, and volume changes.