The PVC pipes which are essentially Poly Vinyl Chloride. It is the latest advent as a replacement of the metal pipes that was in use for last several centuries. The PVC is in some cases, not inert whereas HDPE pipes are commonly used for their inert characteristics and they are highly corrosion resistant. No taking in terms of the material of production the PVC pipes are made of Poly Vinyl Chloride out of which plasticizers are added to it to make it much more flexible and soft. The production of HDPE pipes, which are High Density Polyethylene pipes which are high in strength in comparison to its density. The highest strength plastic pipes available are the HDPE pipes. Now coming to the application of these two pipes the PVC pipes has got more application areas than the HDPE pipes like PVC pipes are used for water distribution and sewage pipelines. The usage of the PVC pipes is also in the field of irrigation across the world for its excellent corrosion resistant characteristics. The sanitary usage of the PVC is also quite high ad has proved to be highly productive one. The HDPE pipes are chemically inert and that it is why in safe and edible oil or in such consumable fluid distribution the usage of HDPE has been found. Due its light weight and high strength in extended distribution system where PVC may prove to be insecure the HDPE pipes play a good role. The abrasion and chemical resistance of the HDPE pipes has been used in the transfer chemical products also, in the market. In some cases even though the cost of the HDPE is greater the smooth flow characteristics of these pipes is more than the common PVC pipes found in the market. HDPE pipes are considered more durable and in terms 60% more safer than the PVC pipes usage in the market. Now coming to the cost factor, obviously HDPE is much more expensive than conventional PVC available in the market and this feature has lead to reduction of the usage of the HDPE pipes on a large scale. In last 7 to 8 years, the usage of the HDPE pipes has been in the field of the telecom industry also. The plasticizers those, which are found in PVC are not found in HDPE which makes up a little difficulty in giving flexibility to the product. The insulation characteristics of PVC pipes are less than the HDPE pipes, and this has been utilized in various core industries. Even though the usage of the PVC pipes is still much more than the HDPE pipes around the world due to the cost factor as well as the lack of flexibility that the HDPE pipes do have than the PVC pipes. The shift from PVC to HDPE has been reported in the sewage line systems by various municipal corporations around the world which is showing a new dimension in the piping market.
A problem with using poly pipe for borecasing is that due to its molecular weight if the bore has a very high static water level then the poly casing will float and come up out of the ground, this is why upvc pipe is used for casing in water bores, it is heavier than water and will sink.
In environmental bores, if the bore is to look for hydrocarbons, such as fuels and oils the HDPE would be used as pvc would be eaten away.