Particle Size Distribution of USGA Rootzone Mix
| USDA System of Classification | Sieve No. | Sieve Opening (millimeters) | Appro. Opening (inches) | USGA Recommendations | |
|
Gravel >2 mm |
6 7 8 |
3.36 2.83 2.38 |
1/8" | 3% max | |
| S A N D |
Very coarse 1-2 mm |
10 12 14 16 |
2.00 1.68 1.41 1.19 |
1/16" | 7% max |
|
Coarse .5-1 mm |
18 20 25 30 |
1.00 0.84 0.71 0.59 |
1/32" | 60% min | |
|
Medium .25-.5 mm |
35 40 45 50 |
0.50 0.42 0.35 0.30 |
1/64" | ||
|
Fine .1-.25 mm |
60 70 80 100 |
0.25 0.21 0.177 0.149 |
1/128" | 20% max | |
|
120 140 |
0.125 0.105 |
1/256" | |||
|
Very fine .05-.1 mm |
170 200 230 270 |
0.088 0.074 0.062 0.053 |
1/512" | 5% maxa | |
|
Silt .002-.05 mm Clay <.002 mm |
325 | 0.044 |
5% maxa 3% maxa |
||
| aTotal particles in these ranges shall not exceed 10% | |||||