Moulding Base Materials

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PGF 2019
Taschenbuch der GIESSEREI PRAXIS
Moulding Materials

Moulding material terminology

Primary constituent for the production of moulding materials for lost
moulds and cores:

  • Moulding base material
  • Moulding sand binder
  • Moulding material additives

Moulding base material:
Consists of natural mineral or synthetic granulates or sand:

  • The moulding base material is a granular aggregate material with certain granulometric properties
  • The grain diameter is between 0.02 and 2.0 mm
  • The moulding base material forms the framework of a mould

Moulding sand binder and hardener
Connects the single grains of the moulding base material by forming bridging bonds between them:

  • Swelling binder (clay/bentonite that swells when water is added)
  • Ceramic binder (alumina solidifies by drying or sintering)
  • Hydraulic binder (gypsum or cement reacts with liquid and hardens)
  • Chemical binder, inorganic or organic (chemical reaction and solidification)

Bridging bond:
Forms the connection between the grains of sand, holding the mould together:

  • Depends on adhesion on the grain surface due to adhesive forces
  • Load capacity of a bond: maximum contact surface and formation of optimum layer thickness

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