HDPE Sheet - White, Black, or lor - iPolyHDPE sheet expands more in length than in width, due to its molecular structure. uv stabilized sandwich lor HDPE sheets blue on white 12×24″ HDPE Sheet - White, Black, or lor - iPoly ... Exhibits nsistent lor & dimensional characteristics 1" x 12" x 12" Polar White UV Stabilized HDPE Sheet. 25 ...