N sand casting, re-usable, permanent patterns are used to make the sand moulds. The preparation and the bonding of this sand mould are the critical step and very often are the rate-controlling step of this process. Two main routes are used for bonding the sand moulds: • the "green sand" consists of mixtures of sand, clay and moisture. • the "dry sand" consists of sand and synthetic binders cured thermally or chem
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