Definition: Ordinary by-product

Classifications

An ordinary by-product (i.e. a by-product which is not exclusive to a single group) is a product technologically linked to the production of other products, but which is produced in several groups (for example, the hydrogen produced during petrochemical refining is technologically linked to that produced in petrochemical manufacture and coal carbonisation and identical to that produced in the group comprising other basic chemical products).
Source:
Eurostat, "NACE Rev. 2, Statistical Classification of Economic Activities in the European Community",Office for Official Publications of the European Communities, Luxembourg, 2008
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