R290
A copper temper designated in BS EN standards, R290 stands for "hard" temper of copper tubes. Copper tubes of R290 material condition are delivered in straight length, in the meanwhile, the mechanical properties, tolerances and carbon residues are different with R220 and R250 temper.
Mechanical Properties of R290 Copper Tubes
- Norminal outside diameter: 6mm min., 267mm max.
- Tensile strength: 290 MPa min. (1 MPa is equivalent to 1 N/mm2)
- Elongation: 3% min.
- Hardness: min. 100
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 |
R290 Product List
| Part Number | Outside Diameter | Wall Thickness | Theoretcial Weight |
|---|---|---|---|
| 8.00mm | 0.60mm | 0.12kg/m | |
| 6.00mm | 1.00mm | 0.14kg/m | |
| 6.00mm | 0.80mm | 0.12kg/m | |
| 6.00mm | 0.60mm | 0.09kg/m |