A Vinyl/PVC product can be made stronger utilizing the proper amount of ultraviolet inhibitors and TI02/Titanium Dioxide which acts as a sun block, plus impact modifiers which provide superior strength, impact resistance and flexibility. The extrusion process is another pivotal difference in separating a quality product from a lesser grade vinyl. Not all vinyl has the same additives in order to make it strong. Some salespeople like to brag about how thick their vinyl profiles are, but really thickness is only a small part of the equation. Just because a product is thick it does not mean it will stand up. So many things go into the process of making a vinyl profile and turning it into a fence. Things such as the quality of chemicals and supply chain (so you have exactly the same raw product to start with), the speed a profile is run at, even the particle size of certain additives all contribute to the quality of vinyl you will end up with.