# Coatings Technology Handbook P02

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## Coatings Technology Handbook P02

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The shear viscosity is defined as the ratio of the shear to the shear strain rate, at the strain rate of interest. Although the viscosity is usually quoted as a number without reference to the strain rate, it is really a function of strain rate. The strain rate dependence and, in certain situations, the time dependence, of the viscosity need to be determined if a meaningful correlation is to be made with coating phenomena.

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