CPVC (Chlorinated Polyvinyl Chloride) and PVC (Polyvinyl Chloride) are both derivatives of polyvinyl chloride, but their chemical structures and properties differ. Here are the differences between CPVC and PVC:
Chemical structure: CPVC is a type of PVC modified by chlorination. Chlorine atoms are introduced into the PVC molecular chain to make it have better heat resistance, corrosion resistance, and flame retardancy. PVC, on the other hand, is a type of polyvinyl chloride that does not contain chlorine.
Heat resistance: CPVC has better heat resistance than PVC. CPVC retains its mechanical strength and stability at higher temperatures, while PVC is prone to deformation, melting, or decomposition at higher temperatures.
Corrosion resistance: CPVC has excellent chemical resistance and can resist the erosion of a variety of acids, alkalis, salts and other chemicals. PVC, on the other hand, has relatively poor corrosion resistance, especially at high temperatures, and is more susceptible to chemical attack.
Flame retardancy: CPVC has excellent flame retardancy, it needs to reach a higher temperature when burning, and the smoke and toxicity produced when burning are low. PVC, on the other hand, has relatively poor flame retardancy and is prone to produce a large amount of smoke and toxic substances when burned.
Applications: Because CPVC has good heat resistance, corrosion resistance and flame retardancy, it is widely used in various high-temperature, high-corrosive and fire-resistant occasions, such as chemical, petroleum, fire protection, construction and other fields. PVC, on the other hand, is more widely used in general occasions, such as construction, packaging, consumer goods and other fields.
In conclusion, the main differences between CPVC and PVC are chemical structure, heat resistance, corrosion resistance, flame retardancy, and application areas. CPVC outperforms PVC in many ways, but is relatively high. In practice, it is necessary to choose the right material according to the specific needs and budget.