One of the major factors which governs the choice and design
of size reduction machines, air classifiers, mixers and dryers, etc. is the
hardness of the material to be processed.
As general rule, the hardness is defined in accordance with Moh's scale of hardness, which divided into 10 grades of
hardness.
Hardness 1 -3 = soft
Hardness 3.5 -5 = medium hard
Hardness 5 -10 = hard
HARDNESS |
MATERIAL |
|
|
1 1 1-2 1-2 1-2 2 2 2 2.5 3 3 3 4 4 4-5 4-5 5 6 6 6-7 7 7 8 8.5 8.5 9 9 9.5 9-9.7 9.7 10 |
Talcum Graphite Boron nitride (BN) Coloured clay Gypsum Whetstone Rock salt
Mica Calcite Chalk Marble Barites Dolomite Magnesite Ironspar Apatite Feldspar Magnetite Rutile Quartz Pyrite Basalt Tungsten carbide Zircon Oxide Corundum Silicon nitride Borium carbide Silicon carbide Borium nitride,cubic Diamond |
|
=============================================
Analysis Sieve Comparison Table
|
ISO 565 1987 |
DIN 4188 1977 |
US Std/ASTM E-11-1987 |
Tyler® |
BS 410 1986 |
|
mm |
mm |
US Mesh |
Mesh |
Equivalent BS Mesh |
|
|
|
Inch |
Inch |
|
|
|
|
3" . |
|
|
|
|
|
2". |
|
|
|
26,5 |
25 |
1.06" |
1.05". |
|
|
25 |
22,4 |
1" |
|
|
|
22,4 |
20 |
7/8" |
0.883" |
|
|
19 |
18 |
3/4" |
0.742" |
|
|
16 |
16 |
5/8" |
0.624" |
|
|
13,2 |
14 |
0.530" |
|
|
|
12,5 |
12,5 |
1/2 " |
|
|
|
11,2 |
11,2 |
7/16" |
0.441" |
|
|
9,5 |
10 |
3/8" |
0.371" |
|
|
|
9 |
|
|
|
|
|
|
|
Mesh |
|
|
8 |
8 |
5/16" |
2.5 |
|
|
6,7 |
7,1 |
0.265" |
3 |
|
|
6,3 |
6,3 |
1/4" |
|
|
|
|
|
Mesh |
|
|
|
5,6 |
5,6 |
3½ |
3.5 |
3 |
|
4,75 |
5 |
4 |
|
3½ |
|
|
4,5 |
|
|
|
|
4 |
4 |
5 |
5 |
4 |
|
3,35 |
3,55 |
6 |
|
5 |
|
|
3,15 |
|
|
|
|
2,8 |
2,8 |
7 |
|
6 |
|
2,36 |
2,5 |
8 |
8 |
7 |
|
|
2,24 |
|
|
|
|
2 |
2 |
10 |
|
8 |
|
1,7 |
1,8 |
12 |
10 |
10 |
|
|
1,6 |
|
|
|
|
1,4 |
1,4 |
14 |
12 |
12 |
|
1,18 |
1,25 |
16 |
14 |
14 |
|
|
1,12 |
|
|
|
|
1 |
1,0 |
18 |
16 |
16 |
|
Microns (µm) |
Microns (µm) |
|
|
|
|
850 |
900 |
|
|
18 |
|
|
800 |
20 |
20 |
|
|
710 |
710 |
25 |
24 |
22 |
|
|
630 |
|
|
|
|
600 |
|
30 |
28 |
25 |
|
|
560 |
|
|
|
|
500 |
500 |
35 |
32 |
30 |
|
|
450 |
|
|
|
|
425 |
430 |
40 |
35 |
36 |
|
|
400 |
|
|
|
|
355 |
355 |
45 |
42 |
44 |
|
|
315 |
|
|
|
|
300 |
|
50 |
48 |
52 |
|
|
280 |
|
|
|
|
250 |
250 |
60 |
60 |
60 |
|
212 |
224 |
70 |
65 |
72 |
|
|
200 |
|
|
|
|
180 |
180 |
80 |
80 |
85 |
|
|
160 |
|
|
|
|
150 |
|
100 |
|
100 |
|
|
140 |
|
|
|
|
125 |
125 |
120 |
115 |
120 |
|
106 |
112 |
140 |
150 |
150 |
|
|
100 |
|
|
|
|
90 |
90 |
170 |
170 |
170 |
|
|
80 |
|
|
|
|
75 |
|
200 |
200 |
200 |
|
|
71 |
|
|
|
|
63 |
63 |
230 |
250 |
240 |
|
53 |
56 |
270 |
270 |
300 |
|
|
50 |
|
|
|
|
45 |
45 |
325 |
325 |
350 |
|
38 |
40 |
400 |
400 |
400 |
|
|
36 |
|
|
|
|
32 |
32 |
450 |
450 |
440 |
|
25 |
25 |
500 |
500 |
|
|
20 |
20 |
635 |
635 |
|
|
16 |
16 |
|
|
|
|
10 |
10 |
|
|
|