Our Lighting Fine Tungsten Filament is manufactured using high-purity tungsten (≥99.95%), ensuring exceptional durability, high-temperature resistance, and excellent electrical conductivity. Designed for use in incandescent lamps, halogen bulbs, and specialized lighting applications, this filament provides superior light output, energy efficiency, and a long operational lifespan.
ungsten has a high melting point, high resistivity, good strength, and low vapor pressure. It is the best material for making incandescent filaments among all pure metals. However, tungsten is hard and brittle, making it difficult to process. When the current passes through the tungsten wire and is heated to a certain temperature, the resistance value of the tungsten wire also increases to a certain value (the resistance value of general metal wire increases with the increase of temperature).
Except for a small amount of tungsten wire used as heating material for high-temperature furnaces, heaters of electron tubes, and reinforcement ribs of composite materials, most of it is used to make filaments of various incandescent lamps and halogen tungsten lamps and electrodes of gas discharge lamps. For tungsten wires or tungsten rods used as cathodes of gas discharge lamps, 0.5-3% thorium must be added to reduce the electron work function, which is called tungsten thorium wire. Since thorium is a radioactive element that pollutes the environment, cerium is used to replace thorium to make tungsten cerium wire or tungsten cerium rod. However, the evaporation rate of cerium is high, so tungsten cerium wire or tungsten cerium rod can only be used for low-power gas discharge lamps.
The specific specifications of tungsten filament are as follows:
