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measurement device used in the paint industry. It is commonly a stainless steel cup with a tiny hole drilled in the centre of the bottom of the cup. There is also a long handle attached to the sides. There are five cup specifications, labelled Zahn cup #x, where x is the number from one through five
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To determine the viscosity of a liquid, the cup is dipped and completely filled with the substance. 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".
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Ascott Zahn Cups are based on measuring the Flow of liquid in seconds. Results should be reported in Zahn-Seconds at a specified temperature for a particular cup.
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It may require cleanup to comply with
Knowledge (XXG)'s content policies, particularly
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Gardco signature Zahn cups and Gardco EZ Zahn cups use different conversions.
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To convert Zahn-Seconds to centistokes, refer to ASTM D4212, D816, and D1084
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On paint standard specifications, one denotes viscosity in this manner:
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Note the above equations are for a
Brookfield series of Zahn cups.
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by using an equation for each cup specification number, where
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A major contributor to this article appears to have a
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396:Centistokes × Specific Gravity = Centipoise
474:(2nd ed.). John Wiley & Sons Inc.
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436:"Gardco :: S90 Zahn Viscosity Cups"
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472:Paint Flow and Pigment Dispersion
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