Tungsten is an excellent electrothermal material, with its key advantages including:
Extremely High Melting Point: Tungsten has the highest melting point among all metals, reaching up to 3422°C. This means that at the normal operating temperature for window heating (typically only 30–70°C to melt frost and ice), tungsten filaments are far from reaching their limit, offering extremely high safety margin and stability.
High Electrical Resistivity: Tungsten has a relatively high electrical resistivity (roughly over three times that of copper). This eliminates the need for extremely long or thin filaments to achieve an appropriate resistance value, enabling sufficient heat generation under vehicle voltages (12V or 24V).
High Mechanical Strength: Tungsten filaments maintain good mechanical strength even at high temperatures and are not prone to deformation or sagging.
Corrosion Resistance: Tungsten has stable chemical properties and is not easily oxidized (especially in vacuum or inert gas environments).
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