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tungsten filament for light We are largest producers of tungsten lamp filaments, wire filament and other specialty components for leading lighting manufactures. Tungsten wires have high thermal conductivity, good corrosion-resistant, nice breaking- resistant. (1): grade: WAL1, WAL2, WAL3, W1, W2, (2): purity at least 99.95% Grade Tungsten % Other impurity % Each impurity % WAL1, WAL2,WAL3 ≥99.95 ≤0.05 ≤0.01 W1 ≥99.95 ≤0.05 ≤0.01 W2 ≥99.95 ≤0.05 ≤0.01 (3): application: * Tungsten heater element and other heater components in semiconductor. * High temperature lamp filament, stock-resistance filament, double helix filament, etc. * Electric incandescent lamp filament, fluorescent light filament, etc. (4): state: in coil or straight, black wire and white wire (5): specification: diameter according to customers’ requirement. We have strict quality control system and provide professional service to our customers around the world.