Detailed Product Description ductile iron casting Sewing machine parts:1) many kinds of materials and processing methods available: a) Grey iron b) Ductile iron c) Ordinary sand castingd) Resin sand castinge) investment casting2) standards: AWWA C110/C153, DIN, EN545, BS, JIS, ISO3) advanced process for soluble glass casting,silicasol casting.4)OEM supplier.