A flexible, flame retardant, irradiated crosslinking, heat-shrinkable modified polyolefin tubing that is recognized by UL under Subject 224, rating voltage 600V, VW-1 at 125°C and by CSA, rating voltage 600V, VW-1 at 125°C, Unlike other typical flame retardant tubing, SUMITUBE F32/F(z) is free of polybrominated biphenyl ethers (PBBES), polybrominated biphenyl oxides (PBBOS), polybrominated biphenyls (PBBS). These chemicals are classified as environment hazardous substance.