This International Standard specifies the general principles of a method for determining the viscosity of polymers and resins in the liquid, emulsified or dispersed state, including polymer dispersions, at a defined shear rate by means of rotational viscometers with standard geometry. Viscosity determinations made in accordance with this standard consist of establishing the relationship between the shear stress and the shear rate. The results obtained with different instruments in accordance with this standard are comparable and apply to controlled shear as well as controlled stress instruments.