PVC (Polyvinyl chloride) and CPVC (Chlorinated Polyvinyl chloride) are both thermoplastic materials that are commonly used in plumbing applications, but there are some differences between the two.
1. Chemical Resistance:
The chemical resistance of PVC (Polyvinyl Chloride) and CPVC (Chlorinated Polyvinyl Chloride) varies due to the differences in their chemical structure. CPVC has an additional chlorine atom compared to PVC, which gives it better chemical resistance.
CPVC has a higher resistance to a wider range of chemicals than PVC, particularly when it comes to acids, bases, and oxidizing agents. It is less likely to be affected by chemicals at high temperatures. For example, CPVC is commonly used in industrial applications where it is exposed to chemicals such as acids, salts, and alkalis, while PVC is not recommended for such applications.
PVC, on the other hand, has better resistance to some organic solvents than CPVC. It also has good resistance to alcohols, hydrocarbons, and non-oxidizing acids. PVC is commonly used for water supply lines, drainage systems, and irrigation systems where it is not exposed to aggressive chemicals.
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2. Temperature Resistance:
The temperature resistance of PVC (Polyvinyl Chloride) and CPVC (Chlorinated Polyvinyl Chloride) is one of the key differences between the two materials. CPVC has a higher temperature resistance than PVC due to the presence of additional chlorine atoms in its molecular structure.
CPVC can handle temperatures up to 200°F (93°C), while PVC can only handle temperatures up to 140°F (60°C). This makes CPVC more suitable for hot water applications, such as for the distribution of hot water from boilers or water heaters. It is commonly used in residential and commercial plumbing systems for hot water supply lines and other applications where hot liquids are transported.
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3. Strength:
The strength of PVC (Polyvinyl Chloride) and CPVC (Chlorinated Polyvinyl Chloride) varies due to the differences in their chemical structure. CPVC is stronger and more durable than PVC due to the presence of additional chlorine atoms in its molecular structure.
CPVC has a higher tensile strength than PVC, which means it can resist higher stresses without breaking or cracking. This makes CPVC a better choice for applications where the piping system is subject to high pressures or stresses, such as in industrial or commercial applications. CPVC is also more resistant to impact damage and abrasion than PVC.
PVC, on the other hand, has good flexibility and is easier to work with than CPVC. It is a suitable choice for low-pressure applications, such as residential plumbing systems.
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4. Cost:
There is a cost difference between PVC (Polyvinyl Chloride) and CPVC (Chlorinated Polyvinyl Chloride). CPVC is more expensive than PVC due to its higher performance and durability.
CPVC costs more per foot than PVC, and the installation of CPVC piping is generally more expensive than PVC due to the need for specialized tools and installation techniques. The cost difference between PVC and CPVC can vary depending on the specific application and the region where the materials are being purchased.
While CPVC is more expensive than PVC, it may be a more cost-effective choice in the long run for applications where its higher performance and durability are needed. For example, in industrial or commercial applications where the piping system is subject to high pressures, temperatures, or corrosive chemicals, CPVC can offer significant cost savings in terms of maintenance, repairs, and replacements.
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