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woven wire woven wire

Woven wire cloth is widely used for filtration and is available in a wide range of materials and mesh sizes. It can be woven from any material which is ductile enough to be drawn into a wire form. Preferred materials are phosphor bronze, stainless steel and monel (nickel alloy). Other materials widely used include aluminium alloys, copper plain mild steel or coated mild steel.

The minimum particle size of wire which can be used depends on the alloy, strength required, temperature and corrosion.
Mesh is described by form of weave and mesh count. A square mesh is the usual form in a plain or twilled weave.


For figuring out mesh sizes you have to count the number of openings from the center of any one wire to the center of a parallel wire one inch away. The number of openings is the mesh size. So a 2 mesh screen means there are two little squares across one linear inch of screen. A 100 mesh screen has 100 openings, and so on. Note, therefore that as the number describing the mesh size increases, the size of the particles decreases. Screens can be made with different thicknesses of wire. The thicker the wires, the smaller is the particle passing through that screen, and vice versa.

This formula can be used to calculate the space between the wires:

(in inch)

(in mm)

When working with these formulas you should be careful with the inch units. There is a difference between the English inch of 25.4 millimetres and the metric inch of 27.07 mm, whereby the latter is used very seldom.

Mesh is described more generally by aperture opening (space between the wires), eg

Coarse – aperture opening 1 to 12 mm
Medium – aperture opening 0.18 to 0.95 mm (180 to 950 mm)
Fine – aperture opening 0.020 to 0.160 mm (20 to 160 mm)

The best way to prevent misunderstandings is the description of the screen through the following characteristics:

- the metal sort or the alloy
- the space between the wires
- the thickness of wire

For example:

  • A stainless steel gauze number 4 with a thickness of wire of 1.2 mm can be better characterised as

    stainless steel gauze;
    space between the wires 5.15 mm
    thickness of wire (diameter) 1.2 mm
  • A monel gauze number 50 with a thickness of wire of 0.20 mm (200 micron) can be better characterised as

    monel gauze
    space between the wires 308 micron
    thickness of wire (diameter) 0.20 mm (200 micron)


A micron is another measurement we use for measuring mesh size. A micron is one-millionth of a meter or one twenty-five thousandth of an inch.

Aperture opening, open area

The aperture opening expresses the open area of the cloth. Wire Mesh contains open spaces (holes) and material. Open area is the total area of the holes divided by the total area of the cloth and is expressed as a percent. In other words, open area describes how much of the wire mesh is open space. This parameter can be calculated by means of the mesh number and the thickness of wire (D). With these two information is it possible to obtain the space between the wires and the open area for every existing mesh number.

(in inch)

(in mm)

(in %)

For an easier handling it is possible to use the following table, which provides the aperture opening and also the relation between space between wires and thickness of wire for every mesh number.

Example:

Mesh number

4

60 100
Thickness of wire 1.2 mm 0.16 mm 0.11 mm
Product number x thickness of wire 4.8 9.6 11.-
Apenture opening 66 % 39 % 32 %

Apenture opening

in %

Produkt
Meshnumber x Thickness of wire in mm

Relation

space between wire and thickness of wire

90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15

1.30
1.44
1.57
1.71
1.84
1.98
2.12
2.26
2.40
2.54
2.68
2.82
2.97
3.11
3.26
3.40
3.55
3.70
3.85
4.00
4.15
4.30
4.46
4.61
4.77
4.92
5.08
5.24
5.40
5.56
5.73
5.89
6.06
6.22
6.39
6.56
6.74
6.91
7.08
7.26
7.44
7.62
7.80
7.99
8.17
8.36
8.55
8.74
8.94
9.14
9.33
9.54
9.74
9.95
10.16
10.37
10.59
10.81
11.03
11.26
11.49
11.72
11.96
12.20
12.45
12.70
12.96
13.22
13.49
13.76
14.04
14.33
14.62
14.93
15.24
15.56

1000:54
1000:60
1000:66
1000:72
1000:78
1000:85
1000:91
1000:98
1000:104
1000:111
1000:118
1000:125
1000:132
1000:140
1000:147
1000:155
1000:163
1000:170
1000:179
1000:187
1000:195
1000:204
1000:213
1000:222
1000:231
1000:240
1000:250
1000:260
1000:270
1000:280
1000:291
1000:302
1000:313
1000:325
1000:336
1000:348
1000:361
1000:374
1000:387
1000:400
1000:414
1000:429
1000:443
1000:459
1000:475
1000:491
1000:508
1000:525
1000:543
1000:562
1000:581
1000:600
1000:622
1000:644
1000:667
1000:690
1000:715
1000:741
1000:768
1000:796
1000:826
1000:857
1000:890
1000:925
1000:961
1000:1000
1000:1041
1000:1085
1000:1132
1000:1182
1000:1236
1000:1294
1000:1357
1000:1425
1000:1500
1000:1582


I.S.W.G.

In England the thickness of wire is not expressed through the wire diameter. Instead of that a number from the special I.S.W.G.-code is used. Other synonyms for this code are S.W.G. or B.W.G.
The table below gives an overview over all I.S.W.G. numbers including the thickness in inch and in millimetres.

I.S.W.G Size in inches Size in mm

Thickness of wire, diameter in mm

0000000
000000
00000
0000
000
00
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50

.500
.464
.432
.400
.372
.348
.324
.300
.276
.252
.232
.212
.192
.176
.160
.144
.128
.116
.104
.092
.080
.072
.064
.056
.048
.040
.036
.032
.028
.024
.022
.020
.018
.0164
.0148
.0136
.0124
.0116
.0108
.0100
.0092
.0084
.0076
.0068
.0060
.0052
.0048
.0044
.0040
.0036
.0032
.0028
.0024
.0020
.0016
.0012
.0010

12.70
11.78
10.97
10.16
9.45
8.84
8.23
7.62
7.01
6.40
5.89
5.38
4.88
4.47
4.06
3.66
3.25
2.95
2.64
2.34
2.03
1.83
1.63
1.42
1.22
1.02
0.914
0.813
0.711
0.609
0.558
0.508
0.457
0.416
0.376
0.345
0.315
0.295
0.274
0.254
0.234
0.213
0.193
0.173
0.152
0.132
0.122
0.112
0.102
0.0914
0.0813
0.0711
0.0610
0.0508
0.0406
0.0005
0.0254

13
12
11
10
9.5
9.-
8.5
8.-
7.-
6.5
6.-
5.5
5.-
4.5
4.-
3.8
3.4
3.-
2.6
2.4
2.-
1.8
1.6
1.4
1.2
1.-
0.9
0.8
0.7
0.6
0.55
0.50
0.45
0.40
0.37
0.34
0.31
0.30
0.28
0.26
0.24
0.22
0.20
0.18
0.16
0.14
0.12'
0.11
0.10
0.090
0.080
0.070
0.060
0.050
0.040
0.030
0.025

Please also check our alternative filtration possibilities

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