Definitions & Formulae

Definitions and Formulae

Aperture (w)

 

 

Wire Diameter (d)

 

 

Mesh Count (n)

 

 

 

Pitch (p)

 

 

Warp

 

 

Weft

 

 

Open Area %

 

 

Porosity

Space between adjacent parallel wires, in mm.

(25.4 / n) – d

 

Diameter of wire before weaving, in mm.

 

 

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)

 

Distance between the centres of two adjacent wires in mm.

w + d or 25.4 / n

 

Wires running lengthwise in the cloth as woven.

 

 

Wires running crosswise in the cloth as woven.

 

 

The fractional open surface area of the wirecloth in the flow direction

(w²) / (w + d)² * 100 (applicable for square meshes only).

 

The fractional void volume of the mesh.

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