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# 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

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