uv stabilized HOBBY hdpe sheets 10mm-HDPE sheets 4×8, Custom Grade HDPE OKAY Polypropylene Homopolymer OKAY Polypropylene polymer ESSENTIAL DIFFERENCES 3 = BEST 2 = BETTER 1 = GOOD RIGIDITY IMPACT STRENGTH SURFACE HARDNESS UV STABILIZED CHEMICAL RESISTANCE EAST OF FABRICATION 73°F (22.8°C) 0°F (-17.8°C) OKAY HDPE Boat Board 2 2 2 1 Yes 2 3