Different manufacturers have replicated the Zahn cup, leading to significant variations in efflux time between cups of the same make, production runs, and even within the same lot. Variations ...

The earliest attempt in the industry to link different viscosity cups' outcomes and associate each with mathematical formulas based on core measurements was made by a sub-committee within ASTM ...

Viscosity is a vital quality-control parameter across a wide range of industries, especially in petroleum, where it provides essential insights into everything from crude oil to refined products.