R250
A copper temper designated in BS EN standards, R250 stands for "half hard" temper of copper tubes.
Tolerances on outside diameter
| Norminal outside diameter | Tolerances on norminal diameter | ||
|---|---|---|---|
applicable to mean diameter (all material conditions) | applicable to any diameter (R290 hard material condition) | applicable to any diameter (R250 half hard material condition) | |
| 6mm ≤ d ≤ 18mm | ±0.04 | ±0.04 | ±0.09 |
| 18mm ﹤ d ≤ 28mm | ±0.05 | ±0.06 | ±0.10 |
| 28mm ﹤ d ≤ 54mm | ±0.06 | ±0.07 | ±0.11 |
| 54mm ﹤ d ≤ 76.1mm | ±0.07 | ±0.10 | ±0.15 |
| 76.1mm ﹤ d ≤ 88.9mm | ±0.07 | ±0.15 | ±0.20 |
| 88.9mm ﹤ d ≤ 108mm | ±0.07 | ±0.20 | ±0.3 |
| 108mm ﹤ d ≤ 159mm | ±0.2 | ±0.7 | ±0.4 |
| 159mm ﹤ d ≤ 267mm | ±0.6 | ±01.5 | n/a |
Quantitative and qualitative specification for carbon residues
Norminal outside diameter d mm | Material condition | Quantitative method - total carbon max. mg/dm2 | Qualitative method - carbon film test |
|---|---|---|---|
| from 10 up to and including 54 | R220 (annealed) | 0.20 | yes |
| R250 (half hard) | 0.20 | yes | |
| R290 (hard) | 0.20 | yes | |
| over 54 | R250 (half hard) | 0.20 | yes |
| R290 (hard) | 1.0 | no |
R250 Product List
| Part Number | Outside Diameter | Wall Thickness | Theoretcial Weight |
|---|---|---|---|
| 18.00mm | 1.00mm | 0.48kg/m | |
| 28.00mm | 1.20mm | 0.90kg/m |