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Stainless sheet or plate that has been slit and stretched in one operation into a rigid diamond- or hexagon-shaped mesh, with no material lost and no welds. It is lighter than the sheet it came from, lets air, light and water through, and is used for walkways and platforms, guards, filters and screens, and architectural façades and ceilings.
Expanded metal is made on a press with a stepped knife: at each stroke the knife slits a row of short cuts in the sheet and stretches the metal between them into a row of diamond-shaped openings, and the sheet advances for the next row. The result is a single piece of metal with no joints, which is stiffer than its weight suggests. In standard (raised) expanded metal the strands are angled; passing it through rolls gives flattened expanded metal with a smooth surface.
A mesh is described by the long and short dimensions of the diamond (LWD and SWD, measured centre to centre of the joints), the strand width and thickness, and the open area. Heavier stainless meshes are used as walkways and platforms where grating would be too heavy, and as guards; fine meshes serve as filters, battery and electrode supports and screens; architectural meshes in a variety of patterns are used for façades, sunscreens and ceilings.
In the GCC stainless expanded metal is used in coastal and process plant walkways and guards and in architectural screens, where 316L is the usual choice. It is imported or expanded locally from imported sheet.
Expanded metal is ordered by pattern (LWD × SWD), strand width and thickness, sheet size, flattened or standard, grade and finish.
Expanded metal patterns are specified by manufacturers' designations; the base sheet is ordered to the material standards below.
| Region | Standard | What it covers |
|---|---|---|
| Europe | EN 10088-2 CEN-CENELEC |
Stainless steels — sheet and strip for general purposes (the base material) |
| USA | ASTM A240/A240M ASTM |
Stainless steel plate, sheet and strip (the base material) |
Grade equivalents and the standards bodies: Steel grades & standards
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