HDPE
A HDPE (high density polyethylene) casing has a nominal weight of at least 935 kg/m³ according to EN 253. Casing made of this material is 100 % resistant to moisture and withstands more intense mechanical stress. The inner side of the pipe is roughened along its entire length - e.g. with a corona. The thermal conductivity is 0.43 W/m.
Standard dimensions of HDPE casing pipes:
| Nominal outer diameter D in mm |
Minimum wall thickness (mm) |
| 75 | 2,2 |
| 90 | 2,2 |
| 110 | 2,5 |
| 125 | 2,5 |
| 140 | 3,0 |
| 160 | 3,0 |
| 180 | 3,0 |
| 200 | 3,2 |
| 225 | 3,5 |
| 250 | 3,9 |
| 280 | 4,4 |
| 315 | 4,9 |
| 355 | 5,6 |
| 400 | 6,3 |
| 450 | 7,0 |
| 500 | 7,8 |
| 560 | 8,8 |
| 630 | 9,8 |
| 710 | 11,1 |
| 800 | 12,5 |
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