The material is cut and stretched while still leaving it attached at the knuckle. This allows it to retain its shape when cut and can't separate or fray. Often cutting to shape is the only fabrication needed.
A major advantage of expanded metal mesh sheet is that this kind of mesh is formed from a single piece of material so the process is not wasteful and therefore cost effective.
Many materials can be expanded including mild steel, stainless steel .iron plate, copper plate, aluminum plate
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