Sumipac Dumet Wire, Glass-to-Metal Seal 0.350MM For Lamp

The iron-nickel alloy wire with the closest glass expansion coefficient is used as the core material, and the outer layer is covered with a good heat conduction and electrical conductivity copper layer.The surface is reworked to form a copper oxide film/barrel, which increases the composite line between the surface of the copper layer and the good sealing of the glass.

Dumet wire is composed of a nickel-iron core in an oxygen-free copper sheath and it forms a vacuum-tight glass-to-metal seal against soda-lime and lead glasses.

Material: Dumet (Nickel-Iron, Copper)
Diameter: 0.350mm
Blongation : Min 15%
Copper Ratio : Min 23% Max 28%
Appearance : GOOD

Ni+Co
41-43% C
.15% max Mn
1.25% max Si
.30% max
S
.02% max P
.02% max Fe
Rest

Storage: Dumet wire should be stored away from moisture.

Cleaning: Prior to assembly / beading, Dumet wire that has been handled can be cleaned chemically in deionized water with 60% formic acid and 10% hydrogen peroxide. The copper surface must be smooth and free of scratches (if needed the surface may be re-polished using a suspension of fine alumina powder in distilled water).

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