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Sand Casting vs Lost Foam Casting: 15 Differences

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15 Differences Between Sand Casting and Lost Foam Casting

Model craft

  • Differences 1#: Open side
    Traditional sand casting must be divided into open sides for easy modeling
    Lost Foam Casting No Open Edge
  • Differences 2#: Draft angle
    Traditional sand casting must have a certain draft angle
    Lost foam casting basically has no or very small draft angle
  • Differences 3#: Composition
    Traditional sand casting consists of an outer core and core
    Lost Foam Casting Single Model
  • Differences 4#: Number of applications
    In traditional sand casting, one model can be used multiple times
    Lost foam casting one type at a time
  • Differences 5#: Material
    Traditional sand-casting metal or wood
    Lost Foam Casting Foam
15 Differences Between Sand Casting and Lost Foam Casting
15 Differences Between Sand Casting and Lost Foam Casting

Modeling process

  • Differences 6#: Molding sand
    Traditional sand casting has core sand mixed with binder, water, and additives
    Lost Foam Casting dry sand without binder, any additives, and water
  • Differences 7#: Sand filling method
    Traditional Sand Casting Mechanical Sand Filling
    Self-gravity micro-vibration sand filling in lost foam casting
  • Differences 8#: Compact way
    Mechanical compaction of traditional sand casting
    The physical effect of lost foam casting (self-weight, micro-vibration, vacuum) is compact
  • Differences 9#: Sandbox features
    Traditional sand casting prepares a special sandbox according to the characteristics of each part
    Simple universal sandbox for lost foam casting
  • Differences 10#: Mold
    Traditional sand casting cavity is composed of the core assembly
    Lost Foam Casting Cavity Real Mold
  • Differences 11#: Coating
    Most of the traditional sand casting does not need coating
    Lost foam casting must have a coating

Pouring process

  • Differences 12#: Filling characteristics
    Traditional sand casting fills the cavity metal with the model
    Physical and chemical effects of the lost foam casting
  • Differences 13#: The main factors affecting the filling speed
    Traditional sand casting pouring system and pouring temperature
    Lost foam casting is mainly affected by the gas pressure state in the mold, the pouring technique, and the pouring temperature


  • Differences 14#: Shakeout
    Traditional sand casting requires strong vibration to knock over the box or lift out the casting. Read More: De-coring Machine
    Automatic Separation of Castings and Sand in Lost Foam Casting
  • Differences 15#: Clean up
    Traditional sand casting needs to polish flash burr and ingate
    Lost foam casting only needs to polish the Ingate, with no flash, and burr.