Welcome back,my friend,now i will share another standard called ASTM D5018-18,Standard Test Method for Shear Viscosity of Coal-Tar and Petroleum Pitches.This standard is from a net friend named Peter from New York.Thanks!
ASTM D5018-18 covers the determination of the apparent shear viscosity of coal-tar and petroleum-based pitches having a Mettler softening point (SP) range of approximately 95 °C to 120 °C (see Test Method D3104).
Summary of Test Method
The viscosity of a pitch, over the temperature range ofabout 40 °C to 100 °C above the SP of the material, is determined using a rotational viscometer.
The recommended specifications herein are for measuring the apparent shear viscosity of binder pitches via a concentric cylinder viscometer. Apparent shear viscosity is theratio of shear stress to shear rate in a unidirectional simple shear flow field at steady state conditions. A concentric cylinder viscometer is useful for measuring the apparent shear viscosity, provided the sample temperature is adequately controlled, the “end-effects ” are negligible, and the gap between rotor/cup is small and remains constant during the test.The extrapolated value of apparent shear viscosity at “zero” shear rate is called shear viscosity.
ASTM D5018-18 pdf can be downloaded on www.freestandardsdownload.com