thick pehd sheet 1/4 application--HDPE sheets 4×8 Tested flatwise position with specimen size of 80mm x 10mm x 4mm. ESCR was measured on 2 mm (78.7 mil) thick mpression molded plate (F50, 10 % Igepal, 50°C . thin pehd plate 1 inch for sale-HDPE high density . 1/2″ x 24″ x 48″ HDPE Sheet 1/2″ x 24″ x 48″ HDPE Sheet.