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Insulation basis

The grain oriented electrical steel is supplied with a thin inorganic coating on the glass film layer, which forms during annealing. A coating thickness of 2 to 5 μm provides good electrical resistance and a high stacking factor.

The coating, which is annealing resistant up to 840 °C, enables wound cores punched laminations to be stress relief annealed. The coating is chemically resistant to any fluid it may be exposed to during the production process. It is unaffected by, and likewise does not affect, the different types of transformer oils.

COLOUR
Colour deviations may occur, but will not affect the properties Phosphate over glasfilm:
grey
COATING
Coated sides both sides
Thickness of coating 2 µm - 5 µm
SURFACE INSULATION RESISTANCE
at room temperature as per DIN IEC 60404-11 > 10 Ω cm2
ANNEALING RESISTANCE
under inert gas as per DIN IEC 60404-12 840 °C / 2 h
CHEMICAL RESISTANCE
to transformer oil good
DESIGNATION
according to IEC 60404-1-1 EC-5-G
according to ASTM A976 C-5 over C-2
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