Five-ply double-wall board uses two fluted mediums and three linerboards, and is the mainstream choice for the appliance and electronics industries. Applications: complete appliance units, electronic equipment, precision instruments and mid-size machinery parts. Performance: balanced compression strength and cushioning, with edge crush well above 3-ply, so one-piece box structures become possible. Selection guide: first choice for units of 15 to 80 kg that travel long distances or are handled repeatedly.