| CONTROL & DESIGN STANDARDS: MONITORING | ||
The other category, non-volatile residue, is a little harder to describe. Technically, it’s the soluble or suspended material along with the insoluble particulate matter remaining after evaporation of a filtered volatile liquid. In other words, it’s the material left behind after a liquid evaporates. The most common source of NVR contaminants is from the cleaning solvents used to clean equipment and products. If you’ve ever cleaned a dirty window, only to later notice the streaks left behind by the cleaner, you’ve seen NVR. |
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