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Nickel Clad Copper and Copper Clad Nickel-Iron Alloy (Dumet) |
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Nickel Clad Copper and Copper Clad Nickel-Iron Alloy (Dumet) |
| Nickel Clad Copper | Temperature (°F) | Resistance ( ohms per cir. mil ft. ) |
| 27% nickel clad copper was developed for use in applications where high temperatures, oxidizing, or corrosive atmospheres exist. It has electrical conductivity approximately 70% that of copper and is produced in sizes 20 AWG and finer. | 100 | 15.0 |
| 200 | 18.2 | |
| 300 | 21.0 | |
| 400 | 23.8 | |
| 500 | 26.9 | |
| 600 | 29.8 | |
| 700 | 32.5 | |
| 800 | 35.9 | |
| 900 | 39.0 | |
| 1000 | 42.3 | |
| 1100 | 45.8 | |
| 1200 | 49.3 | |
| 1300 | 53.0 | |
| 1400 | 57.5 | |
| Copper Clad Nickel-Iron Alloy (Dumet) | Typical Chemical Composition |
| Dumet is a copper clad nickel-iron alloy widely used to obtain hermetic seals in soft glass. This is possible because the thermal expansion of Dumet closely matches that of glass, and the material "wets" well, effecting the bond with the glass. Dumet is commonly supplied electroplated with gold, tin, or solder. | Nickel - 41-42.5% |
| Manganese - .75-1.25% | |
| Silicon - .3% max | |
| Carbon - .08% max | |
| Sulfur - .02% max | |
| Phosphorus - .02% max | |
| Residuals - 1% max | |
| Iron....balance | |
| Copper Cladding | |
| Copper - 99.99% min | |
| Oxygen - 0% |
