1 – used Sturtevant model 4 SDM pilot plant Micronizer Fluid Energy Mill. This unit uses air powered grinding pulverizing and classifying to between 44 and 1/2 micron particles. Stainless steel machine and base. 4 in. diameter grinding chamber. Stainless steel collector can. Top mounted Acrison Screw Feeder model 1015SE with 1/2 hp motor.