PVC pipe 1,high mechnical strength 2,good electrical insulation 3,good printing and welding 4,color consistant 1).Durable, in general ... impact force, acide and so on.3).High oxygen value, good combustion resistance, self extinguished.4).Smooth surface, light insulating medium ... ,outlooking color, thickness of the tube is optional. ROUND PVC CABLE TRUNKING