B/T 5561-2012 "Surfactants, Method for the Determination of Viscosity and Flow Properties with a swirl/spin Viscometer" specifies a method for the measurement of flow properties of non-solid surfactants using a swirl/spin Viscometer with a coaxial cylinder measurement system. This standard applies to different types of rheological phenomena, such as shear thinning and swelling measurement, and includes descriptions of properties such as time-dependent viscosity and thixotropic. The standard describes in detail the requirements for reagents and materials, as well as the determination steps, conditions of use of the instrument and calibration methods. Final test results should be presented as the relationship between shear rate and viscosity Linear dispersion or tabular form to ensure Measurement accuracy of less than +/- 3%. Test reports should include complete test conditions, sample prepative instructions and measurement details to ensure Reliability and reproducibility of results.