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Loss of structural integrity due to higher temperatures
Technical data always refer to measurements at 68° F. At higher temperatures these values are reduced due to increasing softening:
| Residual strength at a temperature of | Soft PVC | Pre-PUR® | Pre-PUR® HT |
|---|---|---|---|
| 68° F | 100% | 100% | 100% |
| 86° F | 70% | 90% | 95% |
| 104° F | 50% | 80% | 90% |
| 122° F | 30% | 70% | 85% |
| 140° F | - | 50% | 75% |
| 158° F | - | 30% | 60% |
| 212° F | - | 20% | 40% |
| 257° F | - | 10% | 20% |
| 302° F | - | - | 10% |
These factors should be taken into account for loads in the overpressure range.
Example: Operating limit for PU material at 104° F:
ptol(104° F) = ptol(68° F) × 80 %