IEC 60371-3-6: Mica-Based Insulating Materials — From Motor Slot Liners to Fire-Resisting Cable Cores

Mica — The Only Natural Mineral Maintaining Insulation Integrity at 1,000°C Flames

IEC 60371-3-6:1992 specifies mica-based insulating materials. Mica (KAl₂(AlSi₃O₁₀)(OH)₂) has extremely high dielectric strength (~200kV/mm), exceptional thermal endurance (>1,200°C melting), and very low moisture absorption — making it the core insulation for HV machine bars and fire-resisting cables.

TNLab — Mica is nature “ultimate insulating mineral” — its 1,200°C thermal endurance is irreplaceable.