No-Bake, Air-Set or Chemically Bonded Sands:

An alternative to the sodium silicate procedure involves the utilization of organic resin binders that cure by chemical reactions that take place at room temperature. Two or more binder components are mixed up along the sand just prior to the moulding operation, and the curing reactions begin instantly. Because the mix is workable for just a short period of time, the moulds (or cores) might be made in a reasonably quick fashion. After a few minutes to a few hours (based on the curing agent and specific binder), the sands harden sufficient to be eliminated from the pattern and are ready to pour.

Several no-bake sand systems are available, along selection being depended on the metal being poured and the particular sand performance characteristics that are wanted. Each of the system is depend on organic resin binders, curing agents or catalysts, and several additives and modifiers. As the sodium silicate moulds, good hot strength, no-bake offers high dimensional accuracy and high resistance to mould- related casting defects. Patterns might incorporate thinner sections and deeper draws. On the contrary to the sodium silicate material, though, the no-bake moulds readily decompose after the metal has solidified, providing outstanding shakeout characteristics.