Dumet .Net

Dumet Wire


Dumet wire is the basic metal component of a Lead-in-Wire providing the required vacuum tight glass-to-metal seal. Dumet consists of a base wire and a sheath. The ratio of both compounds should be in well-balanced proportions. Only then is it guaranteed to obtain a vacuum tight conductor through glass. This principle is used mainly in the lighting and diode production.

In order to produce dumet wire, some key processes must be precisely controlled. In the set-up line, the cladding is realized: a Copper clad on a core wire (e.g. Nickel-Iron). This Copper cladded wire is welded to achieve an endless length and drawn to obtain the requested diameter. Finally the surface of the dumet has to be treated to guarantee a good adhesion to the glass. Depending on the application requirements this well-defined surface treatment can be done in either ways: Borating, oxidizing or nickel-plating.

It  is available in various surface finishes: electrically oxidized and 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.

Product application:

  1. Lead-in wires for bulbs, fluorescent lamps, energy saving lamps, LED and auto lamps
  2. Conductors for components such as rectifier diodes, surge suppressor and temperature sensors.

Controlled Expansion Alloys


Controlled expansion alloys are iron-nickel alloys or iron-nickel-cobalt alloys used for applications in which thermal size change of the metal must be considered in the design. Composition and crystal structure help to determine each alloy’s thermal expansion behavior. The alloy expansion rate is most commonly stated in terms of an average coefficient of thermal expansion. Controlled expansion alloys were developed to demonstrate a coefficient of thermal expansion within certain ranges.

Iron and nickel have very similar coefficients of thermal expansion. However, the addition of nickel to iron can result in the creation of an alloy in which the coefficient is reduced by an order of magnitude. Controlled expansion alloys fall into three categories: low thermal expansion alloys, matching expansion alloys and high thermal expansion alloys. The most common controlled expansion alloys are Alloy K, Alloy 45/46, Alloy 4750, Alloy 48, Alloy 49, Alloy 52.

Low expansion alloys are iron-nickel alloys that exhibit an extremely low expansion rate at room temperature. These materials have been utilised in modern applications that require metal to be joined to glass or ceramic, and areas where the thermal expansion rates of the materials must coincide to prevent differential expansion within the joint area. They are used in industries such as electronics, medical (laser and x-ray machines), aerospace engineering, telecommunications and cryogenic components.

Product application:

  1. Optical device components and optical communication equipment
  2. Semiconductor equipment, thin-film processing equipment and FPD manufacturing equipment
  3. Lead frames and Block gauges (standard length pieces)

For more information you can visit:
JLC Electromet Pvt. Ltd. - A major manufacturer of nickel alloys and dumet wires or
Gem Electromechanicals Pvt. Ltd. - A leading manufacturer of Lead-in-wires and Lamp Components

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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