Originally Posted by redman

Sounds like you need a lubricant like magnesium sterate or steric acid. 1% of each will get almost all powders flowing well. Flow rate is the rate at which a powder will flow I.E into a capsule. When powders stick or clog it denotes a poor flow rate.

I studied flow rates of powders when I worked for a company who designed tablet excipients. When powders are too fine they dont flow well as the particles are too small and bond together.

Take this as an example.

Get some icing suggar (confectionary suggar) and throw it againts a wall. Even if it is bone dry some of it will stick to the wall as the grains surface area is large in comparison to its weight.

Now go and get some table suggar and do the same, it wont stick to the wall because its weight is large in comparison to its surface area.