![]() ![]() 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. HFO is characterized by a maximum density of 1010 kg/m 3 at 15☌, and a maximum viscosity of 700 mm 2 /s (cSt) at 50☌ according to. As a result of the wide compositional spectrum, HFO is defined by processing, physical and final use characteristics. Note the above equations are for a Brookfield series of Zahn cups. 1 cP 0.01 poise 0.01 gram per cm second 0.001 Pascal second 1 milliPascal second 0. HFOs are blended to achieve certain viscosity and flow characteristics for a given use. 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. 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". Determine the linear relationship between kinematic viscosity and. Kinematic viscosity (cSt) Dynamic viscosity (cP) Specific gravity (g/cm) Calculate. The graph shows that viscosity increases with increasing propylene glycol concentration. Next, plot the kinematic viscosities as a function of the molarities of the known samples. To determine the viscosity of a liquid, the cup is dipped and completely filled with the substance. Then convert the kinematic viscosity to dynamic viscosity by multiplying by the mass density. 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. It is usually expressed in centipoise (cP) (1 cP 0.001 Pa.s). The absolute or dynamic viscosity is equal to the kinematic viscosity, multiplied by the density of the fluid. There are five cup specifications, labelled Zahn cup #x, where x is the number from one through five (see table below). Usually, centistokes (cSt) is used (1 cSt 0.01 St 1 mm 2/s). There is also a long handle attached to the sides. It is commonly a stainless steel cup with a tiny hole drilled in the centre of the bottom of the cup. A Zahn cup is a viscosity measurement device widely used in the paint industry. ![]()
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