Woven Wire Mesh Buyers Guide
ISO 4783-1 is the international standard relating to the choice of aperture size and wire diameter combinations.
Wire Mesh Designations
MESH No.
Mesh number denotes
the number of openings or wires per English inch (25.4mm) in both directions
counting from the centre of any wire to a point exactly one inch distant.
The wires running lengthways during manufacture are referred to as warp wires, and the wires that run across the width of the cloth are referred to as weft or shoot wires.
PLAIN WEAVE (PW).
Each weft wire passes over one and under one warp wire, and each warp wire passes over one and under one weft wire. (See Figure 1).
TWILL WEAVE (TW).
Each weft wire passes over two and under two warp wires, and each warp wire passes over and under two weft wires. (See Figure 2).
APERTURE WIDTH (w).
The distance between two adjacent warp or weft wires measured in the projected plain at mid positions.
The aperture width (in mm) is calculated according to the
following equation:
Aperture size and wire diameter calculations are according to ISO 4783-2
Open Screening Area (Ao)
Percentage of the surface
of all the apertures in the total screening surface calculated using
the following equation:
Mass per unit area (Kg/M2)
The nominal mass per unit area can be calculated from the following equation:
Standard metal and alloy availability
The table below gives a general guide to the standard materials available and their associated wire diameter limitations.
| Type of Material | Limiting Wire Diameter |
|---|---|
| Stainless Steel 304,316 and low carbon grades | All specifications |
| Stainless Steel High Tensile (For Reverse Dutch Weaves) | 0.20mm |
| Plain or Mild Steel | 0.132mm |
| Galvanised Mild Steel | 0.17mm |
| Aluminium | 0.224mm |
| Copper | 0.05mm |
| Brass | 0.04mm |
| Phosphor Bronze | 0.035mm |
| Pure Nickels & Alloys | 0.035mm |
| Pure Silver | All specifications |
| *Monel 400 | 0.04mm |
| *Incoloy, Inconel Heat Resistant Specifications | 0.112mm |