grey high density plastic board 1/4″ applicationMarine Board HDPE (High Density Polyethylene) Plastic Sheet 1/4 1/4 inch Self-lubricating high density plastic board factory . Please Feel free to give your inquiry in the form below. ... also referred to as HDPE or PE300, in full sheets and custom cut pieces in 10mm, 12mm, 15mm, 20mm, 25mm ...