ABSTRACT
Before progressing in this text, the concepts of cohesion and friction need to be touched on. Friction is of importance in several pharmaceutical aspects. It will be seen in the following chapter, that ease of powder blending is, to some degree, a function of the friction between particles. (This may partly be due to shape factors.) It is also of importance in powder flow and, finally, in the ejection of tablets from tablet dies. The latter aspect necessitates the addition of lubricants (e.g., magnesium stearate) to powder mixes and granulations.
