This was our very first blog back in 2013 we have decided to revisit it as stainless steel woven mesh is our largest product range and therefore extremely topical for our Customers. Our sales team have enormous knowledge of stainless steel woven mesh and its applications. We would like to share this with you to build and improve your knowledge of stainless steel woven mesh especially when identifying and specifying. The ‘Ins and Outs’ of woven mesh is straight forward and once you’ve got it- you’ve got it or you can always refer back!
Stainless steel woven mesh comes in a wide variety of specifications providing a range of mechanical properties. Coarser weaves woven from heavier wire diameters provide useful mechanical strength, while finer weaves are useful as filtration and screening due to their smaller aperture.
Woven Mesh Terminology/ Definition
Mesh – The number of openings per lineal inch (25.4mm)
SWG – Standard wire gauge
Aperture – The distance between two adjacent wires (opening)
Diameter –The thickness of the wire before weaving
Pitch – The distance between the middle point of two adjacent wires or the sum of the aperture width and the wire diameter
% Open Area– The ratio of the area of the aperture to the area of the mesh expressed in percentage terms
Warp – All wires running lengthwise of the cloth as woven
Weft –All wires running across the cloth as woven
We often have customer requests to identify stainless woven mesh whether it be to match or replace an existing specification. Using the formulas and steps below will help you identify your mesh. Give us a call if you get stuck! For terminology refer above
Formulas for Identifying Woven Mesh
To calculate the aperture
1. Count the number of apertures over 1 inch (N)
2. Measure the length covered by the N apertures (24.5mm) (L)
3. Measure the wire diameter (D)
Working example of calculating the aperture of 6/20 woven wire mesh
1. Number of apertures counted N = 6
2. Length covered by apertures centre to centre L = 25.4mm
3. Diameter of wire D = 0.9mm
The woven wire is identified as 3.33mm aperture / 0.9mm diameter.
Please see data sheet below, for the example that we have worked through.
If the aperture and the diameter are known the mesh count can be determined.
Percentage Open Area
Woven mesh consists of open spaces and material. Open area is the total area of the holes divided by the total area of the cloth and is expressed as a percentage.
A micron is another measurement used for measuring mesh size. A micron is one millionth of a meter or one twenty five thousandth of an inch
At SSWM we stock four different weaves, plain weave, intercrimp weave, lockcrimp weave and twill weave.
Plain weave is the most common and simplest weave. Each warp wire (the wire running parallel to the length of the cloth) passes alternatively over and under the wires running transversely through the cloth at 90 degree angles.
Intercrimp has extra crimps in the warp and weft wire between the intersections.
Is produced with pre-crimped wire. Lock crimp weave is stabilised by a notch or bump at the wire intersections.
Twill weave is made by passing each fill wire alternatively over and under two warp wires.
Selvage is the term for self finished edge. In woven mesh, selvages are the edges the run parallel to the warp (the longitudinal wire the run the length of the mesh), and are created by the weft wire looping back at the end of each row.