Definition and Composition
UPVC (Unplasticized Polyvinyl Chloride), also known as rigid PVC, is an amorphous thermoplastic resin made by the polymerization reaction of vinyl chloride monomers. It is composed of certain additives (such as stabilizers, lubricants, fillers, etc.). These additives include CPVC, PE, ABS, EVA, MBS, etc.

Physical and Chemical Properties
UPVC has a high melt viscosity and poor fluidity. Even when the injection pressure and melt temperature are increased, the change in fluidity is not significant. Its molding temperature is very close to the thermal decomposition temperature, and the temperature range in which it can be molded is very narrow. Therefore, it is a difficult-to-mold material. UPVC pipes have excellent characteristics such as accurate temperature sensing, timed melting, and rapid absorption of the active ingredients of additives. Meanwhile, by using world-famous calcium-zinc composite heat stabilizers, the catalytic degradation and oxidative decomposition of the resin in the molten state can be effectively controlled.

Application Areas
UPVC pipes are mainly applied in fields such as tap water distribution pipe projects. Due to their strong corrosion resistance and being not prone to electrochemical reactions with acids, alkalis, and salts, they are especially suitable for water supply pipe networks. In addition, UPVC pipes are also used in the internal and external drainage systems of buildings, with the advantages of corrosion resistance, convenient installation, and long service life.

Advantages and Disadvantages
The advantages of UPVC pipes include corrosion resistance, being not prone to electrochemical reactions with acids, alkalis, and salts, light texture, convenient installation and construction, and small fluid resistance. However, its disadvantages are that it is difficult to mold, the molding temperature range is narrow, and the service temperature should not be too high.