1.PVC CPVC How to produce
a. PVC is made from the polymerization of vinyl chloride monomer (VCM). PVC is a non-toxic, aging-resistant, and acid- and alkali-resistant material, which makes it ideal for use in chemical pipelines.
b. CPVC is a polymeric material made from polyvinyl chloride modified by re-chlorination. After the chlorination of PVC resin, the chlorine content is increased from 56.7% to 63-69%. The chemical stability is increased, thus improving the material’s heat resistance and resistance to corrosion by acids, alkalis, salts and oxidizers.
2.Differences.
a. Chlorine content Vicat temperature
| Material | Chlorine content | Vicat temperature |
| PVC | ：56% | 71-75℃ |
| CPVC | ：67% | 100-125℃ |
Note： Vicat temperature (heat deflection temperature): a measure of performance, the higher the Vicat temperature the better the performance.
b. Main physical properties of CPVC and PVC
| Item | PVC | CPVC |
| Density (Kg/m2) | 1380~1450 | 1450~1530 |
| Softening temperature (℃) | 72~82 | 90~125 |
| Shore D hardness | 93 | 95 |
| Tensile strength (MPa) | 39~58 | 54~70 |
| Bending strength (Mpa) | 105 | 120 |
| Elongation at tear (%) | 120 | 80 |
c. UPVC physical properties table.
| Item | Unit | Standard value | Measurement method |
| Density | kg/m³ | 1350 to 1460 | ISO 1183 |
| Vicat softening temperature | ℃ | (pipe)≥80 (fittings)≥70 | ISO 2507 |
| Tensile strength | MPa | MPa≥40 | ISO 6259 |
| Impact strength | KJ/m² | 11.0 | ISO 179 |
| Longitudinal shrinkage | % | ≤5 | ISO 2505 |
| Drop hammer impact test (0°C) | TIR | ≤10% | ISO3127 |
d. CPVC Physical Properties Table
| Item | Unit | Standard value | Measurement method |
| Density | kg/m³ | 1450 to 1650 | ISO 1183 |
| Vicat softening temperature | ℃ | (pipe)≥110 (fittings)≥103 | ISO 2507 |
| Tensile strength | MPa | MPa≥50 | ISO 6259 |
| Impact strength | KJ/m² | 8.0 | ISO 179 |
| Longitudinal shrinkage | % | ≤5 | ISO 2505 |
| Drop hammer impact test (0°C) | TIR | ≤10% | ISO3127 |
e. UPVC/CPVC pipe operating temperature and pressure comparison table.
The operating pressure for UPVC/CPVC pipes is 100% at room temperature of 73°F (23°C) and the percentage of residual operating pressure as the temperature rises.
| ℉ | 73 | 80 | 90 | 100 | 110 | 120 | 130 | 140 | 150 | 160 | 170 | 180 | 190 | 200 | 210 |
| ℃ | 23 | 27 | 32 | 38 | 43 | 49 | 54 | 60 | 66 | 71 | 77 | 82 | 88 | 93 | 99 |
| UPVC | 100% | 90% | 75% | 62% | 50% | 40% | 30% | 22% | 0% | 0% | 0% | 0% | 0% | 0% | 0% |
| CPVC | 100% | 100% | 91% | 82% | 73% | 65% | 57% | 50% | 45% | 40% | 32% | 25% | 22% | 20% | 0% |
PVC Pipes and Fittings Vicat temperature and working pressure versus CPVC
1.PVC Pipes and fittings: Vicat temperature of 71-75°C
2.CPVC pipe Vicat temperature 110°C JC -701, CPVC pipe Vicat temperature 103°C ZS -601, CPVC raw material Vicat temperature 121°C – 125°C
3. The flowability (rheology) requirements of pipe processing are higher than those of tubes, which are regulated by adding additives, and the Vicat temperature is lower than that of general tubes.
4. Drop hammer test Measured strength more than 2 times higher than ordinary PVC
5、Hydrostatic test Higher than ordinary PVC.
6、The maximum allowable working temperature of the PVC piping system is 60℃ and the long-term working temperature is 45℃.
7.CPVC Pipes systems have a maximum allowable operating temperature of 110 °C and a long-term operating temperature of 95 °C. They are suitable for the transport of hot water and corrosive media within the pressure range permitted by the standard.
PVC & CPVC pipes are identical in that
- Both have corrosion resistance and are not easily scaled.
- Impact resistance, not easy to deform the inner wall smooth.
- Good heat insulation, non-conductive, easy to bond, long service life, and other characteristics.
- UPVC and CPVC piping systems are easy and fast to maintain, no need to stop for a long time, and cause huge losses.
Therefore, UPVC and CPVC piping systems are the first choices for industrial piping design because of the advantages of high-cost performance and low construction cost.
PVC & CPVC pipes applications.
1.PVC Pipes and fittings are suitable for conveying some corrosive media at temperatures below 45°C; they can also be used for the conveyance of common pressure fluids and are generally used for water supply and drainage pipes, agricultural irrigation pipes, environmental engineering pipes, air conditioning pipes, etc.
2.Cpvc pipes and Fittings are generally used in petroleum, chemical, electronic, electric power, metallurgy, paper making, food and beverage, pharmaceutical, electroplating, and other industrial fields.
