The experimental data obtained from the rheometer was well described by Krieger and Dougherty model with pm off 0.68. Mooney model with value ranging from 1.35 to 1.91 could not describe the experi mental data at the powder volume fraction above 25% and Roscoe model started over prediction at the powder volume fraction above 50% Therefore, in this study we have employed Krieger and Dougherty model to represent the powder volume fraction effect