| 摘要 |
PURPOSE:To perform quantity production for a product of equalized quality high accurately through molding work, by using non-contractible synthetic resin of unsaturated polyester or the like as the base monomer, mixing 30-70% metallic powder by volume to the base monomer and forming the product of specific gravity 4-6. CONSTITUTION:A main unit 1 is of combined molded material, prepared by using a non-contractible synthetic resin material P of unsaturated by polyester or the like for the base monomer and mixing about 30% through 70% pulverulent grains F by volume ratio crushed with metals of pure iron, iron oxide, gun metal, etc., and constituted by integral molding with a central shaft hole 2 and its peripheral weight part 3. |
