Answer:
Nonvolatile Residue Inspection (NVR)—involves extraction of soil from a dirty surface into a solvent. The solvent is then evaporated onto a coupon of known weight after the solvent is evaporated off the coupon, any residue will be deposited on the coupon. The coupon is then re-weighed and any weight increase detected is attributed to the nonvolatile residue. Many solvents can be used for this purpose. It is important to use a solvent that can dissolve the soil being detected. (Isopropyl alcohol, methylene chloride, acetone and other solvents have been used for this purpose.)
To get more information on how to measure cleanliness, contact Alconox Critical Cleaning Experts at cleaning@alconox.com
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