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Stainless steel is a generic term for a family of corrosion resistant alloy steels containing 10.5% or more chromium. Stainless steel does not readily corrode, rust or stain with water as ordinary steel does. However, it is not fully stain-proof in low-oxygen, high-salinity, or poor air-circulation environments.

For further information refer to ASSDA

The major difference between Grade 304 and Grade 316, is that Grade 316 has the addition of molybdenum to its chemical composition, which greatly improves its resistance to corrosion, particularly to pitting.

Grade 316 is often referred to as marine grade stainless steel because of its excellent resistance to corrosion in sea water. Please be aware that stainless steel still requires cleaning, a simple soap solution will keep your stainless steel sparkling.

Grade 304

18-20% Chromium and 8-10.5% Nickel

Grade 316

16-18% Chromium; 10-14% Nickel; 2-3% Molybdenum

Tea staining is the discoloration of the surface of stainless steel by corrosion. It is a cosmetic issue that does not affect the structural integrity of the material. It occurs most commonly within about 5km of the coast, however also occurs in polluted urban areas too.

To avoid tea staining the surface should be maintained by washing with water. A rule of thumb to follow is, when washing nearby windows also wash the stainless steel.

Further to regular cleaning, we reccomend for stainless steel specified for external purpose to be electropolished after fabrication.

For further information refer to


Our cleaning, care and maintenance page

Cleaning, Care and Maintenance of Stainless Steel

There are many benefits of using stainless steel over galvanised wire;

  • Corrosion resistance
  • Fire and heat resistance
  • Hygiene
  • Aesthetic appearance
  • Strength-to-weight advantage
  • Ease of fabrication
  • Impact resistance
  • Long term value
  • Life Cycle of Stainless Steel

Mesh – The distance between two adjacent parallel wires, measured from centre to centre of the wires

Diameter – Thickness of the wire

Mesh – The number of openings per lineal inch

SWG – Standard wire gauge

Aperture– The distance between two adjacent wires

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

Calculating the aperture

  1. Count of a convenient number of apertures(N)
  2. Measure the length covered by the N apertures(L)
  3. Measure the wire diameter(D)
  4. The average aperture(A)


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
  4. Aperture


The woven wire is identified as 3.33mm aperture / 0.9mm diameter

Mesh Count
If the aperture and the diameter are known the mesh count can be determined


Percentage Open Area

Micron conversion

Plain Weave


The most common and simplest weaves.Each warp wire (wire running parallel to the length of the cloth) passes alternatively over and under the wires running transversly through the cloth at 90 degree angles.

Intercrimp Weave

Has extra crimps in warp and weft wires between intersections.

Lock Crimp Weave


Is produced with pre-crimped wire. Lock crimp weave is stabilised by a notch or bump at the wire intersections.

Twill Weave


Is Produced by passing each fill wire alternatively over and under two warp wires.

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