What is Replication?

27 February 2012
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Replication is a physical production process that involves actually pressing the discs during manufacture from a glass master. Replicated discs are also referred to as ROM discs, standing for ‘Read-Only Memory’ (as opposed to the CD-R where the ‘R’ stands for ‘Recordable’).

The glass master is made of glass that has been coated by a chemical, which is burned off with a laser. The glass master is a ‘negative’ of the master and it is then coated with a molten nickel compound and turned into a  ‘stamper’. The stamper punches tiny pits in the production discs that use molten aluminium as the reflective surface and polycarbonate for the remainder of the disc.

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Replication is a very quick and cost-effective production method for larger quantities of discs (1000 or more). Due to the high setup costs this type of production is not suitable for smaller production runs. Replicated discs are then printed using a five colour silk screen or offset lithographic process, resulting in a very high quality disc.

 

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