The present invention relates to high thermal resistance synthetic rubber and a compound for a wheel balance weight using the same. In some aspects, the high specific gravity compound for the wheel balance weight has excellent curve adhesive strength and is capable of being cut and used as needed. Provided herein is a method of forming a high thermal resistance elastic body synthetic rubber. The method includes blending acrylic rubber and fluoro rubber. A wheel balance weight having a high specific gravity elastic body can be formed by using the high thermal resistance synthetic rubber described herein as a base polymer and a metal powder.