Results should be reported in Zahn-Seconds at a specified temperature for a particular cup. Īscott Zahn Cups are based on measuring the Flow of liquid in seconds. Gardco signature Zahn cups and Gardco EZ Zahn cups use different conversions. Note the above equations are for a Brookfield series of Zahn cups. One can convert efflux time to kinematic viscosity by using an equation for each cup specification number, where t is the efflux time and ν is the kinematic viscosity in centistokes. Zahn Cup Technical Specification Conversion On paint standard specifications, one denotes viscosity in this manner: efflux time, Zahn cup number. In liquids the viscosity increases as the temperature decreases so that, in addition to the viscosity of the liquid, the. Previously the viscosity was given in poises (or centipoises, 1 cP 1 mPas). After lifting the cup out of the substance the user measures the time until the liquid streaming out of it breaks up, this is the corresponding "efflux time". Measurement units, Dynamic Viscosity Converter, Dynamic Viscosity Converter, Centipoises(cP), Grams per centimeter second(g/(cms)), Kilograms per meter. The dynamic viscosity (Greek letter eta) is normally given in millipascal-seconds (mPas) and is usually determined by using a rotary viscometer. In industry sectors where the viscosity of liquids or gases is crucial, these units are commonly used. One poise is equivalent to 0.1 Pa s, while one centipoise equals 0.001 Pas. However, other commonly used units include poise (P) and centipoise (cP). To determine the viscosity of a liquid, the cup is dipped and completely filled with the substance. In the International System of Units or (SI), viscosity is measured in pascal-seconds (Pa s). They are manufactured in accordance to ASTM D 4212, ASTM D1084 and ASTM D816 Large number cup sizes are used when viscosity is high, while low number cup sizes are used when viscosity is low. There are five cup specifications, labelled Zahn cup #x, where x is the number from one through five (see table below). There is also a long handle attached to the sides. Centipoise (cP) is a unit of dynamic viscosity that allows for the quantification and comparison of a fluids resistance to flow. To a rough approximation, liquids are about. At 20° C the viscosity of water is 1.0 × 10 -3 Pa It expresses the force needed to maintain a unit. It is commonly a stainless steel cup with a tiny hole drilled in the centre of the bottom of the cup. A poise is the centimetre-gram-second (cgs) unit of viscosity. A Zahn cup is a viscosity measurement device widely used in the paint industry.
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