Home » News » custom HDPE board » 5-25mm natural HDPE board for Marine mponents 5-25mm Durable hdpe plate for Marine mponents Generic HDPE (High Density Polyethylene) Sheet, Opaque White, Standard Tolerance, 14 Inch Thickness, 6 Inch Width, 12 Inch Length by Technology Island (6 Inch X 12 Inch) 3.7 out of 5 stars.