Differences between UPVC and PVC-U pipes
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What is the difference between UPVC and PVC-U pipes? Are they the same?
Different types of UPVC pipes, also known as rigid polyvinyl chloride pipes or U-PVC pipes, are highly resistant to corrosion and erosion by acids, alkalis, salts, and oils. They are lightweight, possess a certain level of mechanical strength, have good hydraulic properties, and are easy to install. However, they tend to age over time; although they can withstand high temperatures, they cannot resist impacts. They are suitable for use in domestic water systems, with fittings used for connections below DN50, while larger diameters above DN65 require different types of connections. PVC-U pipes, also known as rigid polyvinyl chloride pipes, are a type of drainage pipe that is formed through single-extrusion in an extruder; they have a smooth inner surface and vertical reinforcing ribs on the outer surface. They are suitable for use in residential drainage systems, and are connected using \"T\"-shaped rubber gaskets
In fact, these two types of pipes are similar.
They should be different, right? If they were the same, why would the writing styles differ?