<p>This Architectural Drawing is AutoCAD 2d drawing of Sign board details in AutoCAD, dwg file. Coroplast is the brand name of the most popular manufacturer of <strong>corrugated plastic sheets</strong>. Corrugated plastic is essentially plastic cardboard. The zig-zagged plastic interior is sandwiched between two smooth sheets of plastic that serves as the exterior making it a good outdoor signage material for temporary use.</p>