The C3 ML coating, water soluble polyester base equivalent to C3 of AISI, improves punchability up to three times as compared to uncoated electrical steel. It is resistant to normal operating temperatures & is highly corrosion resistant (C3 ML coatings can be used as a corrosion undercoat for C6 coatings) but will not withstand stress-relieving annealing (SRA). It is suitable for applications where medium level of inter laminar resistance is required. Suitable for small and medium sized motors.
Parameter Value
Colour1 Light Golden Yellow
Average Coating Thickness µm 1.5 ± 0.5
Stacking Factor3 >97.5
Typical Average Insulation Resistivity4 In Amps 0.39
Weldable *
Pencil Hardness 8H
Punchability5 3.0 X
Corrosion Resistance Good
Resistant To Organic Solvents Oil & Lubricant Oil Resist
Resistant To Freon Gas --

  • 1 Colour deviation is possible without effect on coating properties.
  • 2 Coating thickness is checked by Fischer Deltascope Coating Thickness Tester.
  • 3 Stacking factor is checked in accordance, with IS 649: 1997.
  • 4 Insulation resistivity is checked in accordance, with IS 649 : 1997.
  • 5 X - Punchability of Bare Steel.
  • * Yes (Conditions Apply).