Green HDPE Sheet - Inventables. Mar 23, 2014 · Green HDPE Sheet Millable high-density polyethylene sheet with a textured surface . Price Part Number Thickness Dimensions; $18.11: 30376-01: 1/2 in 12 in × 12 in $18.69: 30376-07: 3/4 in 8 in × 12 in Quantity Product Details.