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First, we need to understand that fluids are divided into Newtonian fluids and non-Newtonian fluids. A Newtonian fluid is a fluid whose viscosity value does not vary with shear rate (rotational speed) and remains constant. For example, the standard oil we use for calibration and calibration is Newtonian fluid. In fact, most of the samples that we are in contact with in our production and life are non-Newtonian fluids (the viscosity will change with the change of shear rate or rotational speed). The rheological properties of non-Newtonian fluid samples are very complex, but they basically change with shear rate (rotation speed) and temperature, and some fluid samples are also related to shear time.

Secondly, we need to understand that the viscosity measurement of the standard viscometer is a relative measurement method. The same (or the same type) sample, if using different range models, or using the same model but different measurement methods (rotor, speed, temperature, reading time, etc.) to measure, the viscosity measured between each other The results are likely to be very different and varied.

Therefore, if you want to compare the viscosity measurement data of the same sample (or the same class), whether you are doing your own internal comparison or with a third party (customer, supplier or peer), be sure to use the same range of viscosity Meter type (L, R, H, etc.) and the same measurement method (including rotor type, rotation speed, test temperature, test or reading time, etc.); otherwise, the test results of the same sample are likely to be very different.