Moulds tend to be used to produce products that need to be hollow in the middle, whereas dies are used to stamp solid products out of media such as steel. DIE IS a block of metal with a special shape or with a pattern cut into it that is used for shaping other pieces of metal such as coins or for making patterns.
Mould or die are the common terms used to describe the tool used to produce plastic parts in moulding. Since moulds have been expensive to manufacture, they were usually only used in mass production where thousands of parts were being produced.
Molding is a technique through which a material, often plastic, but also metal, rubber, or powder mixtures is shaped on the outline of a die or mold. ... There are two primary types of plastics: thermosets and thermoplastics.