PVC is a thermoplastic resin, that is approximately 57 percent salt and 43 percent oil based. It is widely regarded as one of the most environmentally friendly plastics, due to its low greenhouse emissions rates during production, and conservation of non-renewable fossil fuels. It is the one of the most commonly used resins in the world, second only to ethylene. Demand for PVC pipes continues to grow because there are a lot advantages, and TDI benefits greatly from use of this material. Pipes made using PVC are corrosion resistant, resistant to most acids and alkalis, as well as durable and long-lasting (with an average life span of 50-70 years). Furthermore, PVC pipes greatly decreases installation time, while maintaining good water flow and loading properties.