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This International Standard defines terms and specifies the classification, performance requirements, test methods, designation and commercial specifications of external vibrators for concrete (hereinafter referred to as “vibrators”). It is applicable only to those power-driven external vibrators used for compacting concrete mix by vibration from the outside. NOTE The use of external vibrators consists in their attachment to forms, vibration stands, vibration tables, surface vibrators and vibrating beams in order to compact the concrete mix.