Rigid PVC (uPVC) is a low-cost, stiff plastic with very good resistance to acids, alkalis and water. It machines, bends with heat and welds with hot air, so it is used for chemical tanks, fume ducts, electroplating baths, pipe fittings and panels. It softens around 60–70 °C; CPVC handles hot water up to about 90 °C.
Quick facts
- Type
- Amorphous thermoplastic
- Density
- About 1.38–1.45 g/cm³
- Service temperature
- Up to about 60 °C (CPVC about 90 °C)
- Chemical resistance
- Very good to acids and alkalis
- Flammability
- Self-extinguishing
- Joining
- Hot-air welding, solvent cement
PVC or polypropylene for tanks?
| PVC | Polypropylene (PP) | |
|---|---|---|
| Max temperature | About 60 °C | About 90–100 °C |
| Stiffness | Higher | Lower |
| Fire behaviour | Self-extinguishing | Burns |
| Solvent cement | Yes | No |
Values are typical. Grades from different makers differ; ask for the supplier's data sheet when it matters.
Machining and fabrication
- Sharp tools, moderate speed, air cooling
- Heat bending with a strip heater
- Hot-air welding with PVC filler rod
- Avoid overheating: it releases harmful fumes
Typical uses
- Chemical and plating tanks
- Fume extraction ducts
- Pipe fittings and valves
- Electrical insulating panels
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Questions
- What is the difference between PVC and uPVC?
- uPVC is unplasticised, rigid PVC. Soft PVC (hoses, cables) has plasticisers added.
- Can PVC be laser cut?
- No. Cutting PVC with a laser releases chlorine gas that harms people and the machine. Use a router or saw.
- PVC or CPVC for hot water?
- CPVC, which handles about 90 °C; standard PVC softens around 60 °C.
The figures on this page are typical values for guidance, written by Diemeco from standard engineering practice. They are not a specification: confirm grades and properties with the relevant standard or the supplier's mill test certificate, and tolerances with your workshop. Last checked 23 October 2026.