The Bug and the Slurry: Bacterial Control in Aqueous Products:*

June 26th, 2009

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Warren/Amplex Superabrasives had a problem at one of its Asian customers—a high capacity manufacturer of data storage disks. Their customer reported a problem in the polycrystalline diamond (PCD) slurry they were being supplied was clogging the filtering processes. To compound the problem, a film of unknown origin was appearing after the clean-up step from texturing.

Their customer had no time to send back any samples. They had three days’ worth of texturing slurry left, before the product line would have to shutdown.

After working with the customer and another division at Warren, they trace the problem to bacteria in the slurry and found that they could quickly resolve the problem by pasteurizing the slurry.

In less than three days, they ID identified the problem, found a solution, produced a 400-bottle order of new pasteurized polycrystalline diamond slurry, and shipped it overseas and where it was received in time to keep their customer running

*Ron Abramshe, “The Bug and the Slurry:Bacterial Control in Aqueous Products,” American Society for Quality: Making the Case for Quality,
September 2007,

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