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The permissible stress that you constructively allow without risking damage, excessive deformation, or violation of standards. Not to confuse with yield stress, which is the stress at which a material transitions from the elastic to the plastic range.
The values over temperature range have been generated with the help of AI. They have been cross-checked for plausibility using various publications.
Note: 1 MPa = 1 N/mm$^2$
| Material | Type | 0°C | 10°C | 20°C | 30°C | 40°C | 50°C | 60°C | 70°C | 80°C | 90°C | Comment |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PE | High-density polyethylene pipe | 35.0 | 33.0 | 30.0 | 28.0 | 25.0 | 22.0 | 20.0 | 17.0 | 15.0 | 13.0 | HDPE: short-term allowable stress |
| PP | Polypropylene pipe | 40.0 | 38.0 | 35.0 | 32.0 | 28.0 | 24.0 | 20.0 | 17.0 | 14.0 | 12.0 | PP-H / PP-B, short-term |
| PVC | polyvinylchloride pipe | 50.0 | 48.0 | 45.0 | 42.0 | 38.0 | 32.0 | 26.0 | 20.0 | 15.0 | 10.0 | PVC-U, strong temperature sensitivity |
| Metal | cast iron steel pipe | 150.0 | 150.0 | 150.0 | 150.0 | 150.0 | 145.0 | 140.0 | 135.0 | 130.0 | 125.0 | Typical allowable stress, short-term |
| Fibre | glass-reinforced plastic (GRP) pipe | 120.0 | 120.0 | 115.0 | 110.0 | 105.0 | 100.0 | 90.0 | 80.0 | 70.0 | 60.0 | Depends strongly on fibre orientation |
| Earth | vitrified clay pipe (VCP) | 15.0 | 15.0 | 15.0 | 15.0 | 15.0 | 15.0 | 15.0 | 15.0 | 15.0 | 15.0 | Brittle material, temperature-insensitive |
| Cem | concrete tube | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | Unreinforced concrete, short-term |