Friction in the rolling of powders should be analyzed in conjunction with their compressibility. The mechanical component of the coefficient of friction (roll surface roughness) at the interface between a roll and a powder being densified (zone II) exerts the strongest influence on the gauge indicators of the compacted strip. Internal friction in powders cannot significantly affect the size of the densification zone, but has a marked effect on the uniformity of density distribution over the surface of the rolled strip. The effect of liquid lubricants on the gauge indicators of roll-compacted strip should be assessed by examining the opposed effects of two factors: An increase in external friction at the roll/powder interface (beginning of zone II) raises the gauge coefficient, while a decrease in the relative apparent density of powders lowers it.