Although PP (polypropylene) and PVC (polyvinyl chloride) lamella tube settlers are used in water treatment sedimentation processes, there are significant differences in material properties, performance and installation methods.
1.Difference of Material
| Item | PP | PVC |
| Density(g/cm3) | 0.9-0.91 | 1.38-1.45 |
| Melting point(℃) | 160-170 | 75-90 |
| Heat distortion temperature(℃) | 110（0.45MPa） | 65（0.45MPa） |
| Linear expansion coefficient | 1.5×10⁻⁴/℃ | 6×10⁻⁵/℃ |
| Tensile strength(MPa) | 30-40 | 50-60 |
2.Comparison of mechanical properties
| Item | PP | PVC |
| Impact resistance | Clearly brittle（＜0℃） | Maintain resilience（-15℃） |
| Long term pressure | Creep is prone to occur under continuous load (support needs to be strengthened) | Good creep resistance |
| Service life | 3-5Years | Longer 20%-30% than PP |
| Maintenance frequency | 3Years | 5Years |
3.Differences in water treatment
| Item | PP | PVC |
| Surface smoothness | 0.8-1.2μm | 0.4-0.6μm |
| Sludge slip angle | 55°-60° | 50°-55° |
| Biofilm adhesion | Weak (hydrophobic) | Strong (polar surface) |
| Design flow rate (m/h) | 1.0-1.5 | 0.8-1.2 |
4.Differences in installation
PP： Hot air welding (260-300 ℃) must be used
PVC： Can be bonded with solvents or welded at low temperatures (180-220 ℃)
Alinna Wang
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Post time: Apr-24-2025