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These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. When the solid stream “breaks” (indicating air passing through orifice), stop the watchĥ. Raise the cup from the material and start the stopwatch, keep your eyes on the flow…Ĥ. Prepare (mix, strain,…) the material to be testedģ.
Viscosity cup, stopwatch, accessories (see above)ġ. Procedure Zahn #2 Cup Procedure Ford #4 Cup How to Measure Paint Viscosity for Spraying However, the two most commonly used for paints are the Zahn #2 and the Ford #4. Both Zahn and Ford cups are available with different sized orifices to provide a wide range of viscosity measurements. The efflux method is one of the most commonly used.
The time taken for a given quantity of material to flow through a given size of orifice in the bottom of a special cup is the efflux method. The time taken for an air bubble to rise through a quantity of material in a tube is the Gardner-Holt Bubble Method. The resistance offered by a material to a falling object passing through it, usually a ball of a given size and weight, is expressed in poise or centipoise (100 poise). The measurement of resistance to movement of a device (such as a paddle or fork) through the material in a rotary motion, is expressed in Krebs Units (KU’s). There are different methods for determining the viscosity of a material, and each method may have one or more units of measurement: Different Methods of Paint Viscosity Measurement In general, material suppliers will recommend the best viscosity to apply the chosen material for a particular job. Viscosity control is therefore essential to achieve a uniform finish. In addition, the flow characteristics determine how well it flows out of the spray gun and therefore how well the material is atomized. solvents, thinners or temperature changes) will affect flow. As a result, anything that affects internal friction (e.g. And the flow characteristics of liquids are directly related to the degree of internal friction. In a nutshell, the viscosity of a paint material is an indication of its ability to resist flow.
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