8mm high-impact strength hdpe plastic sheets for Marine HDPE Sheets High Density Polyethylene, Black, White, lors. HDPE Marine Board, Sheet- Stress Relieved-Matte Surface. Technical Data Sheet: UV Resistant – Does not HENAN OKAYorb water Polar White, Seaform, Sand Shade, Light Grey, Dolphin Grey, or Black: NOTE: Standard tolerances estimated at .060