The MET water immersion test (‘blue dye test’) for pharmaceutical blisters is now available with a choice of pumps. Packs under test are immersed in water whilst a vacuum is drawn in the test chamber. Leaking blister pockets are identified by a stream of bubbles leaving the leak site. Also, the offending pocket will fill with water following release of the vacuum. The vacuum is generated by a venturi pump in the zero electronics version of the equipment. Alternatively, a clean electric vacuum pump can be applied.

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