DS DS/EN ISO 7686
DS DSEN SO 7686 2005-NOV-09 Plastcs ppes and fttngs - Determnaton of opacty
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This Standard specifies a method for the determination of the opacity of plastics pipes and
fittings.
Annex A gives guidance on the light transmission of opaque pipes and fittings.
NOTE It is necessary for a pipe or fitting used for water supply which is exposed to visible light during service to be sufficiently opaque to prevent algae growth.