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Patch test
A method by which a specified volume of fluid is filtered through a membrane philtre of known pore structure. All particulate matter in excess of an "average size," determined by the membrane characteristics, is retained on its surface. Thus, the membrane is discoloured by an amount proportional to the particulate level of the fluid sample. Visually comparing the test philtre with standard patches of known contamination levels determines acceptability for a given fluid.
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- Part of Speech: noun
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- Industry/Domain: Industrial machinery
- Category: Industrial lubricants
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