CLEAPSS DT - Supporting practical work in science, technology and art

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The production of a one-piece component, often of complex shape, from molten metal poured into the cavity of a sand mould (oil-bonded or green sand). The pattern is sometimes made of expanded polystyrene, which is left in place and is vaporised by the hot metal. Alternatively, a steel mould can be used where re-use is envisaged. Composite moulds, eg, thin MDF forms between steel plates, are sometimes used for one-off exercises, especially when using low-melting point metals.
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