PUR - Internal Polyurethane
PUR
The PUR range from DN 100 to 2000 features a polyurethane coating deposited on the pipes in the factory. The ends, socket and spigot, are protected by a thick epoxy coating.
This PUR range is intended for use with highly aggressive water with respect to cement mortar. It completes the NATURAL or CLASSIC ranges where the cement mortar coating cannot be used.
A polyurethane coating applied in PAM plants
The polyurethane lining is deposited inside the pipes in the PAM plants. Internal manufacture ensures rigorous control of the coating application conditions. The polyurethane used by PAM is a solvent-free two-component system. The pipe is heated to a temperature at which the coating can be sprayed on.
For pipes in the PAM PUR range:
– the inside of the pipe barrel is coated with polyurethane,
– the outside of the spigot and socket are coated with zinc-rich paint and epoxy.
Highly demanding technical specifications
Due to the thickness of its polyurethane layer, the ductile iron pipe is fully protected against the most aggressive water as well as during transport and handling operations.
Thickness of polyurethane coating on PUR pipes
| DN | Average thickness μm | Minimum thickness μm |
|---|---|---|
| 100-200 | 1300 | 800 |
| 200-2000 | 1500 | 800 |
The PUR coating complies with European standard EN 15655.
Technical specifications of the Polyurethane coating according to EN 15655
| N° | Parameter | Requirement Refer to EN 15655 for the precise definition of the test methods |
|---|---|---|
| 1 | Chemical resistance | Less than 15% weight increase after immersion in deionised water Less than 2% weight loss after drying |
| 1 | Chemical resistance | Less than 10% weight increase after immersion Less than 4% weight loss after drying |
| 2 | Indirect impact strength | 8j/mm of PU on the pipe barrel coated with |
| 3 | Resistance to ovalisation | Static deformation test |
| 4 | Elongation at break | >2.5% |
| 5 | Specific resistance of the coating in 0.1 m NaCl solution | >10.m2 |
| 6 | Resistance ratio | >0.8 |
| 7 | Resistance to light ageing | Adhesion great to 8 MPa after 6 months' outdoor storage |
| 8 | Non-porosity | No breakdown with Holiday detector at 3kV |
| 9 | Hardness | Shore hardness > 70 |
| 10 | Adhesion | >8 MPa to 20°C |
The PUR coating can be used for water at permanent operating temperatures up to 45 °C.
The PUR coating is suitable for water of pH between 1 and 13.