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Everything You Wanted To Know About Dumet Wire

Lamp Grade Dumet Wire

MATERIAL DATA SHEET

Dumet Wire: Lamp 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 oxidised, borax coated, nickel plated, bare (uncoated).

Borated surface finish Dumet is used in Lead-in-wires for lamps. Dumet forms a glass-to-metal seal while manufacturing these lamps. The oxidised Dumet is used in Lead-in-wires, diodes and capacitor slug leads application.

Composition:
Core


Ni

C

Mn

Si

S

P

Fe

41 - 43

0.05 max

1.0 max

0.30 max

0.02 max

0.02 max

Rest

Copper Sheath

Two other grades of are also available:

Mechanical Properties


Co-efficient of Linear expansion (20 - 400°C) Radial

8.5 - 10.0  x 10-6/°C

Co-efficient of Linear expansion (20 - 400°C) Axial

5.5 - 7.0  x 10-6/°C

Electrical Resistivity µOhm-cm

6 to 9

Tensile Strength (Annealed)

50 - 65 Kg/mm²

Elongation Upon Fracture

20 min

Surface Finish
For Borated and Oxidised Dumet, colour is as per ASTM colour standard F-29-63T. The colours have been divided into three parts.


Light

Medium

Dark

0.5YR - 8.5R

7.5R - 5.5R

4.5R - 2.5R

For Nickel-Plated Dumet wire, standard plating thickness is 2 microns and 4 microns.
Available Dimensions


Diameter (D) (mm)

Tolerance (mm)

Max out-of-roundness

0.20 - 1.0

±0.010

0.010

1.0 - 2.0

±1% of D

1% of D

Packaging :
Available on many types of spools. Common spool in use has following dimensions (mm) :


Spool Type

Traverse (mm)

Bore (mm)

Flange (mm)

Tare (gm.)

Dumet-SP

52

48

100

60 gms

Barrel/drum packaging and other standard DIN spools are also available upon request.
Dumet spools are individually sealed with plastic film and put in an air-tight plastic container with activated desiccant.

 

JLC Electromet, Jaipur makes lamps components Nickel and nickel alloys for Superalloys, Defence Metals, Import Substitution , Metallurgy. Nickel Alloys in Nickel Wires and Nickel Strips. Aloso Nickel-Copper with Nickel-Iron as Cupronickel and Nickel Chromium for Electronics used in Nickel-Cadmium Batteries. Welding Rod Core Wires and Thermocouple wires with Compensating wires and Extension wires. Spark Plug wires as spark plug profile and spark plug side wire. Lamp materials with Lamp components for Lighting Bulbs and Tubelights. Dumet and Glass to metal seal.

Electrodes along with Lead-in-wire as Plating and plated wires. Coated wires, NPS aka Nickel Plated, Steel and Nickel Plated Bronze, Nickel Plated copper and Nickel Plating along with Tin Plating for Solder Plating. Nickel alloys as Wires, Strips, Rods, Cables, Stranded wires and Fine wires. Magnetic Soft Alloys for Magnetic Compensators.

Heating wires and Furnace elements along with Copper Nickel resistance wire and Resistance wire as Resistance strip for Shunts. Manganin as Constantan, Fecral, Kanthal, driverharries and Invar and Monel and Inconel and Nichrome. Metals for Bimetal Strips, Welding Rod Wires and Cladded Wires and High Permeability Alloys.

JLC Electromet, Jaipur These alloys are sometimes referred to as MONEL or NICORROS and made in Wires Strips Rods Cables Stranded wires Fine wires contain nickel with copper and small amounts of nickel and manganese into Nickel, nickel alloys, Nickel Wires and Nickel Strips. A typical alloy is the used in lamps components and as Magnetic Compensators Heating wires Furnace elements Copper Nickel resistance wire, Resistance wire, Resistance strip and Shunts. This contains Nickel and nickel alloys, Nickel Wires and Nickel Strips including Nickel-Copper, Nickel-Iron, Cupronickel and Nickel Chromium. There are also a small number ofnickel alloys in Lead-in-wire Plating plated wires, Coated wires NPS Nickel Plated Steel Nickel Plated Bronze, Nickel Plated copper, Nickel Plating, Tin Plating, Solder Plating.

Used in Superalloys ,Defence Metals, Electronics, Nickel-Cadmium Batteries, Welding Rod Core Wires, Thermocouple wires, Compensating wires, Extension wires, Spark Plug wires, spark plug profile, spark plug side wire, Lamp materials, Lamp components, Lighting, Bulbs, Tubelights, Dumet, Glass to metal seal, Electrodes. These alloys are used as Manganin, Constantan, Fecral, Kanthal, driverharries, Invar, Monel, Inconel, Nichrome where a higher strength is required compared to pure nickel. They have a wider range of environments such as Bimetal Strips, Welding Rod Wires, Cladded Wires, High Permeability Alloys, where they resist corrosion but in some specialised applications, such as in Metallurgy for Import Substitution, nickel alloys would be superior.

This group of nickel alloys are frequently sold under nickel alloy trade name specifications. Common trade names are Nickel alloy HASTELLOY, INCOLOY, INCONEL, Nickel alloy NICROFER, and NIMONIC. Nickel alloy HASTELLOY is a registered trade name of Haynes Intl. Lead-in-Wire in Nickel alloy INCOLOY, INCONEL, Nickel alloy MONEL and Nickel alloy NIMONIC are registered trade names of the INCO family of companies. Nickel alloy INVAR is a registered trademark of Imphy S.A. Nickel alloy MU-METAL is a registered trademark of Telcon Metals Ltd. nickel alloys NICORROS and Nickel alloy NICROFER are registered tradenames of Krupp UM GmbH Lead Wire

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