ISO 25983 is the first international standard for bamboo winding composite pipe, updated in 2024. It covers classification, materials, dimensions, mechanical properties, and test methods — forming the basis for engineering design and procurement acceptance.
Key updates in the 2024 edition
| Section | 2022 edition | 2024 update |
|---|---|---|
| Scope | DN150–DN2000 | Added DN100–DN3000 |
| Pressure class | PN0.6–PN2.5 | Added PN4.0 high-pressure series |
| Ring stiffness | SN1250–SN10000 | Added SN16000 |
| Resin content | ≥20% | ≥25% (higher durability) |
| Water absorption | ≤5% | ≤3% (stricter) |
| Aging test | Not required | Added 1,000 h UV aging test |
| Connection types | Socket-and-gasket | Added flange and electrofusion connections |
Impact on engineering and procurement
- Resin content increased from ≥20% to ≥25%: product durability improves but cost rises about 8–12%.
- UV aging test added: pipe intended for outdoor exposure must pass this test.
- Water absorption tightened from ≤5% to ≤3%: demands better resin impregnation in production.
- DN3000 large-diameter series: expands applications in drainage and marine engineering.
- PN4.0 high-pressure series: can be used for medium-pressure gas transmission with additional safety certification.
Procurement acceptance checklist
- Check product marking: should include DN, PN, SN, batch number, and ISO 25983 identification.
- Inspect appearance: no bubbles, no delamination, no cracks, uniform color.
- Sampling tests: ring stiffness (≥ nominal), Barcol hardness (≥40), hydrostatic test (1.5×PN for 10 min).
- Request reports: factory inspection report, third-party type-test report.
- Confirm 2024 edition compliance: request supplier declaration of ISO 25983:2024 conformity.
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