Inspection data from 1988 to 1990 validated a previous prediction equa
tion for corn particle size distribution and showed the relative distr
ibution to be independent of market location, BCFM level, and other gr
ade factor data. Samples (62) of corn screenings obtained from country
elevators were size-separated in 2164-in. increments, from 4.5164 in.
to 16164 in. Smaller particles had lower bulk density, higher particl
e density, more mycotoxins, higher protein, and lower starch than larg
er particles. About 17% of the material was larger than 12164-in., whi
ch means it would not have been classed as broken corn-foreign materia
l in the grades. Removal efficiency for commercial cleaners was estima
ted, by size increment, as a function of removal efficiency for BCFM.
The elevators sending samples provided data on handling,rates, cleanin
g parameters, and volume handled. No elevator parameter except screen
size influenced the properties or size distribution of screenings.