Investigation: the tube concerned was returned by the customer, and 2 small black fms could be seen suspended in the additive.Photographs were also attached, showing the fms at various magnifications.Visual examination of the 200 retained samples from the implicated lot number did not identify any instances of fm.Dhr/bhr review: a review of the dhr did not identify any issues associated with the reported defect.Investigation conclusion: evaluation of the returned sample and review of the attached photos confirmed the reported defect.Confirmed.Bd was able to duplicate or confirm the customer¿s indicated failure mode with the sample and photos provided.Root cause description: the most likely root cause of the fm is that it entered the tube in the period between filling with additive and evacuation /stoppering.Unfortunately, the origin of the fm is not known as the constituents could not be identified.Much work has been done since this tube was manufactured in an effort to limit the possibility of fm being able to enter the tubes.This has resulted in a significant reduction in complaints of this nature.The next step in this work is to introduce new covers for the trolleys used to transport open tubes through processing.
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