1. Ordinary sand type weight iron: Wet sand type, dry sand type, chemically hardened sand type.
2. Special weight iron: Special weight iron can be divided into two categories according to different modeling materials. One type of natural mineral sandstone is used as the main modeling material, such as investment mold iron, shell type weight iron, negative pressure weight iron, mud type weight iron, real weight iron, ceramic type weight iron, etc. One type uses metal as the main casting material, such as metal type weight iron, centrifugal weight iron, continuous weight iron, pressure weight
iron, low pressure weight iron.