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Aperture (w)
Space between adjacent parallel wires, in mm.
(25.4 / n) – d
Wire Diameter (d)
Diameter of wire before weaving, in mm.
Mesh Count (n)
Number of apertures per lineal inch measured from the centre of one wire to a point 1 inch (25.4 mm) distant.
25.4 / (w + d)
Pitch (p)
Distance between the centres of two adjacent wires in mm.
w + d or 25.4 / n
Warp
Wires running lengthwise in the cloth as woven.
Weft
Wires running crosswise in the cloth as woven.
Open Area %
The fractional open surface area of the wirecloth in the flow direction
(w²) / (w + d)² * 100 (applicable for square meshes only).
Porosity
The fractional void volume of the mesh.
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