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The 41-400N Series Norton hot surface ignitors are made of high-purity silicon nitridewhich combines physical and thermal strength with stable electrical properties. The 41-400N Series is designed to reach ignition temperature(s) within 17 seconds. They have 18-gauge nickel chrome lead wires embedded and metalized in place for maximum holding strength and electrical conductivity. The lead wires are also enclosed with a special high temperature fiberglass insulation providing total electrical protection.