AA-GWR Water Retention Meters
Principle of Measurement
The method is based on pressure filtration of coatings under an externally applied air pressure over a certain time period. It utilizes gravimetric determination of the aqueous phase penetrating through a filter and absorbed by a paper sample.
The measurement is very sensitive to changes in coating colour formulation and has good reproducibility because the procedure is simple and the measurement system is well defined.
Various contact times and pressures can be easily studied.
 |