Zahn cup viscosity - meaning and definition. What is Zahn cup viscosity
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What (who) is Zahn cup viscosity - definition

EFFLUX TIME
Zahn viscosity; Efflux time
  • Zahn Cup Technical Specification
  • Zahn Cup

Zahn cup         
A Zahn cup is a viscosity measurement device widely 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.
Volume viscosity         
Bulk viscosity; Bulk Viscosity; Second Viscosity Coefficient; Second viscosity; Second coefficient of viscosity
Volume viscosity (also called bulk viscosity, or dilatational viscosity) is a material property relevant for characterizing fluid flow. Common symbols are \zeta, \mu', \mu_\mathrm{b}, \kappa or \xi.
Extensional viscosity         
POLYMER SOLUTION PARAMETER
Elongational viscosity
Extensional viscosity (also known as elongational viscosity) is a viscosity coefficient when applied stress is extensional stress.Barnes, H.

Wikipedia

Zahn cup

A Zahn cup is a viscosity measurement device widely 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 (see table below). Large number cup sizes are used when viscosity is high, while low number cup sizes are used when viscosity is low. They are manufactured in accordance to ASTM D 4212, ASTM D1084 and ASTM D816

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".

On paint standard specifications, one denotes viscosity in this manner: efflux time, Zahn cup number.