is the term for the outer protective cladding of induction furnace coils, consist- ing of flexible ceramic-organic panels of glass fibre materials. This serves to pro- tect the coil against metallic dusts and spray iron during operation. For safety reasons, no materials or paint coatings may be used that are impermeable to moisture. These would then act as a damp course, which can lead to winding shorts with leakage of water out of the coil. If this water penetrates into the area of the smelt, this can easily cause water vapour explosions, which usually result in the uncontrolled ejection of melt from the furnace and the breakthrough of molten mass through the coil. This can also lead to serious injury to personnel.
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