Hearing protectors. Safety requirements and testing - Ear-muffs attached to an industrial safety helmet Ingestion-build-177197 pre-treatment of test pieces

pre-treatment of test pieces

BS EN 12350-1:2009 Testing fresh concrete

but excluding filler

custom and practice since the publication of BS 5839-8:1998 and introduces the following principal changes:

Tolerances and mass

Hearing protectors. Safety requirements and testing - Ear-muffs attached to an industrial safety helmet Ingestion-build-177197 pre-treatment of test piecesThe particular requirement in relation to the ability of hearing protectors to reduce noise below daily limit levels is addressed in the standard by requiring the sound attenuation of the hearing protectors, measured in accordance with EN 24869 1, to be not less than a specified minimum. Further, by requiring that the measured sound attenuation be declared, the selection of suitable hearing protectors for individual circumstances may be undertaken