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I Product Introduction
The CPVC resin is made by chlorination modification of PVC resin and is one advanced engineering material. This product is white or canary loose grain or powder with no smell, odorless and innocuity. After chlorination, the irregularity of molecular bond of the PVC resin and the polarity of molecular chain increase, the dissolvability and chemical stability of the resin also increase, and accordingly improve the heat resistance and resist the corrosion of acid, caustic, salt and oxidant etc. In addition, it improve the mechanical performance of numerical heat distortion temperature and chlo rine content increases from 56.7% to 63-69% and Vicat softening temperature from 72-82 ºC to 90-125 ºC ; its highest service temperature can reach 110 ºC and long-term service temperature can reach 95 ºC . Accordingly, CPVC is one kind of advanced engineering plastic with vast foreground.
Because CPVC has so superior high temperature, corrosion resistance and flame retardant performance that it has been widely used in making each different industry pipeline, hot and cold pipeline and fire pipeline. The advantages of CPVC pipe can be reflected in the following areas:
1. strong thermo-stablility
2. easy installation
The connection method are very similar with PVC. Most commonly used and simple connection method is resolver cementation. Other connection methods are threaded connection, flange connection and electrode connections.
3. non-corrosive oxygen permeability
CPVC have the anti-oxygen, therefore the oxygen seepage from the radiator will not bring metal corrosion.
4. reducing the infiltration of additives
In order to prevent oxidation, some modified plastics needs to increase the massive antioxidant that may be infiltrated into the water supply system, causing the ill-smelling smell.
5. without the impact of chlori ne in water
A lot of polyolefin materials (including PP, PE) may be decomposed with water, while CPVC is not affected by the impact of residual chlo rine in water that there is no cracks and leakage.
6. good flame retardancy
CPVC limiting oxygen index is 60, therefore it will not burn in the air. It has the characteristics: Misfires the flame decoction, not to increase the fire set, restrict flame spread, low smoke generation.
7. CPVC has excellent chemical resistance to non-polar strong acid and alkali. Commonly used to substitute the metal to process the corrosive material, such as the poor quality of water, acidic material alkaline matter and other peroxide solutions.
8. the low thermal conductivity
CPVC thermal conductivity is only 1.05. Heat is not easy to disseminate from the pipeline, heat loss of pipeline is low.
9. bacteria breeding is not easy
CPVC is not influenced by the impact of residual c hlorine in water. So it will not result in cracks and leaks. Inner wall of pipe is smooth, not easy to breed bacteria. The research indicated that the breeding of germs in CPVC pipe is far lower than other materials such as copper, steel and other plastic pipe.
10. low thermal expansion
CPVC thermal-expansion coefficient is lower than other plastics. The tube expansion is very small when tube-pass heat, unlike other types of channels (such as PP-rrp) due to the higher temperature caused by heat expansion coefficient that could cause snake bending, the existence safe hidden danger and eyesores.
11. the test of time
None of a thermoplastic material such as CPVC, avoid the maintenance after 40 year hot water system's test, and displays its excellent performance.
II Comparison of resin indexes
| Index | PVC | CPVC |
| Vicat softening temperature(ºC) | 72-82 | 100-125 |
| Tensile strength(MPa) | 39-58 | 54-70 |
| Bend strength(MPa) | 105 | 120 |
| Linear coefficient of thermalexpansion(K-1) | (6-7)×10-5 | (7.5-8)×10-5 |
| Extension at break | 120 | 50 |
| Item | Unit | Index | |
| SW-J700 | SW-Z500 | ||
| 30-mesh screening rate | % | ≥99 | ≥99 |
| Volatile content | % | ≤0.40 | ≤0.40 |
| chlo rine content | % | 66-69 | 65~67 |
| Thermal decomposition temperature | ºC | ≥110 | ≥120 |
| Appearant density | g/cm3 | 0.50~0.70 | 0.50~0.70 |
| K value (raw material PVC) | 65 | 57 | |
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