1/4″ Thermoforming pehd sheet factory 1/4 Thermoforming hdpe pad whosesaler-HDPE sheets 4×8 HIGH DENSITY (HDPE) Polyethylene Sheets – 48" x 96" up to 60" x 120". Thicknesses range from 0.02" to 4". Polyethylene Rods – Diameters from 0.25" to 9". For rods up to 3" diameter, standard lengths are 8' or 10'.