No, PVC does not crack or split. The pipes are made to withstand a lot of abuse. The thickness of the walls is 0.4 to 0.6 mm. The outside layer of the pipe is 0.4 to 0.6 mm thick. The inside layer is 0.4 to 0.6 mm thick. The wall thickness of a 1/2-inch-diameter pipe is 0.8 to 1.2 mm. The thickness is 0.8 to 1.2 mm. The thickness of a 3/4-inch-diameter pipe is 1.2 to 1.8 mm. The thickness is 1.2 to 1.8 mm. The 1/2-inch diameter has a wall 0.8 to 1