Black HDPE Plastic Sheet 2″ x 6″ x 12″ High Density Feb 10, 2022 · Black HDPE Plastic Polyethylene Sheets 2″ x 6″ x 12″. HDPE has good insulation properties and is easy to weld. HDPE is a st effective material for both indoor and outdoor applications. Features of HDPE sheets are. HDPE Geomembrane Liner []