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By-product

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A by-product is a secondary product derived from a manufacturing process or chemical reaction. It is not the primary product or service being produced. A by-product can be useful and marketable or it can be considered waste.

IEA offers the following definition for the purpose of life-cycle assessment:[1]

... main products, co-products (which involve similar revenues to the main product), by-products (which result in smaller revenues), and waste products (which provide little or no revenue).

Major by-productsEdit

Animal sourcesEdit

Template:See also

VegetationEdit

Minerals and petrochemicalsEdit

OtherEdit

See also Edit

References Edit

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