Foamed PVCs are lightweight but also solid boards with a smooth surface. They are very resistant to water, moisture and scratch and are versatile. It can be manually cut, drilled, milled, bent, glued and printed. They are sold mostly in larger sizes and thicknesses from 1mm to 20mm in white and color plates in thicknesses from 3mm to 5mm.
HPS means tough polystyrene, but do not be fooled with polystyrene as you know, it does not have much in common. On the contrary, they are very solid plastic boards, but it is still possible to cut them manually. They are very resistant to water, moisture and heat, and you can do almost everything: cut, turn, drill, milling, screw, easy glue and dye.