| Material | Roughness (mm) |
|---|---|
| Aluminium, copper, lead, brass | 0.001-0.002 |
| PVC and plastics | 0.0015-0.007 |
| Smooth Rubber | 0.006-0.07 |
| Stainless Steel | 0.015 |
| Steel Commercial Pipe | 0.045-0.09 |
| Stretched Steel | 0.015 |
| Weld Steel | 0.045 |
| Carbon Steel (New) | 0.02-0.05 |
| Carbon Steel (New) | 0.02-0.05 |
| Carbon Steel (New) | 0.02-0.05 |
| Carbon Steel (Worn) | 0.05-0.15 |
| Carbon Steel (Badly Corroded) | 0.15-1 |
| Cast Iron (New) | 0.25-0.8 |
| Cast Iron (Worn) | 0.8-1.5 |
| Cast Iron (Corroded) | 1.5-2.5 |
| Galvanized Iron | 0.025-0.15 |
| Smoothed Cement | 0.3 |
| Ordinary Concrete | 0.3-1 |
| Rough Concrete | 0.8-3 |