Q1: The viscosity of a coating is 3.18 Poise at a shear rate of 1000 sec and 307 Poise at a shear rate of 0.01 sec ! Assuming that the coating viscosity profile follows Casson's expression when n=0.50, calculate the coating yield values and its viscosity at infinite shear rate. The Casson equation is used to relate the viscosity of a coating to the applied shear rate to generate a viscosity profile. (Temple Patton Prob 16.1) The Casson equations to use are: (Dn)-(D), D, 1 D D Where h = high shear rate conditions and I = low shear rate conditions, to = yield value and n- is the viscosity at infinite shear rate