PVC pressure pipes are manufactured from unplasticized polyvinyl chloride polymer (a Thermoplastic material) using the extrusion process. PVC (also known as uPVC and PVC-U) pipes were introduced to Sri Lanka in the late 1950s by S-lon and are now widely accepted for use in water supply, irrigation and sewerage rising main systems. They are light in weight, easy to join together, making uPVC a good alternative to the more traditional materials. Their high strength to weight ratio together with exceptional resistance to corrosion or chemical attack makes these pipes ideal for major infrastructure applications.