PVC pipe is constructed of polyvinyl chloride, whereas PPR pipe is built of polypropylene random copolymer. The major difference between PPR pipe thickness and PVC pipe wall thickness is in the wall thickness. Both PPR pipe and PVC pipe have the words written on them at a glance. They are easy to comprehend at a glance, and the PPR pipe is durable. Not only does it not break like PVC pipe can, but it will not burst into flames like some types of PVC pipe can do if exposed to heat or burning materials. The other thing that differentiates PPR pipe from PVC pipe is the color. PPR pipe comes in about two dozen colors while PVC pipe usually comes in white or black. However, there are some manufacturers that produce PVC pipe in other colors as well. Both PPR pipe and PVC pipe are used for water piping. But because PPR pipe is thicker, it can handle higher pressures than PVC pipe. This means that if you were to connect both types of pipe together, even though PVC pipe is cheaper, the PPR pipe would need to be used instead because it can handle higher pressures. Also worth mentioning is that PVC pipe has a shorter lifespan than PPR pipe. Because of this, when you decide what type of pipe you want to use for your project, make sure to go with the one that will last longer so you don't have to replace it too soon.