Diode Grade Dumet Wire
MATERIAL DATA SHEET
DUMET WIRE: Diode Grade
Material description
Dumet wire consists of a nickel-iron core in an oxygen-free-high-conductivity copper sheath. It is available in various surface finishes: electrically oxidized, borax coated.
Borated surface finish Dumet is used in Lead-in-wires for lamps. Dumet forms a glass-to-metal seal while manufacturing these lamps. The oxidized Dumet is used in Lead-in-wires, diodes and capacitor slug leads application.
Composition
Core
| Ni | C | Mn | Si | S | P | Fe |
| 46 – 48 | 0.05 max | 0.50 max | 0.30 max | 0.02 max | 0.02 max | Rest |
Copper Sheath ( 14 - 19 % of the total weigh) 99.96% minimum copper with 0.00 Oxygen
Mechanical Properties
| Co-efficient of Linear expansion (20 - 400°C) Radial | Co-efficient of Linear expansion (20 - 400°C) Axial |
Electrical Resistivity Microhm-cm |
Tensile Strength (annealed) |
Elongation upon fracture |
9.0 – 10.5 x 10-6/°C |
7.5 – 9.0 x 10-6/°C |
10 to 13 |
50-75 Kg/mm2 |
15 min |
Surface Finish
For Borated and Oxidised Dumet, colour is as per ASTM colour standard F-29-63T.
Medium |
7.5R-5.5R |
Available Dimensions
Diameter (D) (mm) |
Tolerance (mm) |
Max out-of-roundness |
0.60-1.60 |
+ 0.005 |
0.005 |
Packaging : |
|
Available on many types of spools. Common spools available are: DIN 125, DIN 160, or coils of 5-12 Kg each with 250-350 mm ID.
Barrel/drum packaging and other standard DIN spools are also available upon request. Dumet spools/ coils are individually sealed with plastic film and put in an air-tight plastic container with activated desiccant.