Abstract: A resin compound for a molding die, a molding die made of the resin compound, and a molding method using the molding die are disclosed. The resin compound includes thermoplastic resin, inorganic fiber reinforcing material and inorganic particle filler, has a flexural strength of 1000 kgf/cm.sub.2 or more and a modulus of elasticity in bending of 70000 kgf/cm.sup.2 or more, and allows machining. A deflection temperature under flexural load of the compound may be 180.degree. C. or more. From this compound, it is possible to provide a core, a cavity block or the like of molding dies which can be accurately finished by machining finishing with a low cost and within a short term, have durability and allows recycling. The molding dies can be applied to various molding methods, and provide accurate molded products with a low cost.

Abstract: This invention relates to a resin composition for scroll compressor parts which comprises(A) about 40 to 70 parts by weight of at least one thermoplastic resin selected from the group consisting of polyphenylene sulfide, polyetheretherketone, polyetherketone, all-aromatic polyester, nylon-4,6, nylon-MXD6, polysulfone, polyarylsulfone, polyethersulfone, polyetherimide, polyamide-imide and polyimide,(B) about 15 to 45 parts by weight of whisker with an average fiber diameter of not more than about 3 .mu.m and a tensile modulus of not less than about 10,000 kgf/mm.sup.2 ;(C) about 10 to 25 parts by weight of heat-resistant fiber with an average fiber diameter of not more than about 30 .mu.m and a tensile modulus of not less than about 6,500 kgf/mm.sup.2 ; and(D) about 5 to 20 parts by weight of a finely divided solid lubricant, the sum total of components (A) to (D) being 100 parts by weight and a method of manufacturing scroll compressor parts characterized in that the above composition is injection molded.