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Pore Sizeb (cm)
Particle Size (cm)
Percentage by Weight
Upper sieve
1.9
>1.9
2–8
Middle sieve
0.79
0.77–1.9
30–50
Lower sieve
0.13
0.18–0.77
Bottom pan
<0.18
≤20
a Based on the use of the Penn State Particle Separator. Data from J. Heinrichs and P. Kononoff, Pennsylvania State University.
b Pores are square, so the largest opening is the diagonal.
