| No. | Item | Material | Notes |
| 1 | Wrap component | Q235，SS304，SS316，etc. | Oil oaint anti-corrosion |
| 2 | Backboard flange | Q235，SS304，SS316，etc. | Oil oaint anti-corrosion |
| 3 | Rubber | NER，NR，EPDM，CR，IIR | |
| 4 | Wrap component | Q235，SS304，SS316，etc. | Oil oaint anti-corrosion |
| Technical parameter | FUB type duct rubber compensator |
| Compensation length | ± 90mm |
| Working pressure | ≤4500pa |
| Temperature range | ~40℃ – 150℃ |
| Installation length | 300 – 450mm |
| Tensile length change rate | ≤15% |
| Tensile strength | ≥12Mpa |
| Elongation at break | ≥300% |
| Permanent set at break | ≤25% |
| Hardness | 58 ± 30 |
| Air aghing | 70℃ × 72h |
| Change in elongation at break | ≥20% |
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