C3 Class Coatings

The C-3 coating will enhance punchability with improvement up to three times as compared to uncoated electrical steel., It is resistant to normal operating temperatures & is highly corrosion resistant (C3 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 high level of interlaminar resistance is required. C-3 coatings are suitable for small and medium sized motors as well as small transformers.

Product Description

FILAMAR ESV C0348 is a totally organic varnish/ enamel coating, C-3 class (ASTM 976) with outstanding punchability. It has a single component polyester base with a melamine cross-linker. It does not withstand SRA (Stress Relieving Annealing) treatment.

Application Range

  • FILAMAR ESV C0348 is suitable for coating thickness of 2-5 microns.

  • It is designed for applications in high line speed coating systems.

  • On account of its outstanding punchability, FILAMAR ESV C0348 is suited for high speed punching machines.

  • Pure organic character of FILAMAR ESV C0348 is responsible for a non-porous weld only at very low coating thickness. Weldability is poor for high thickness.

  • Wide range of applicable coating thickness (2-5 microns) distinguishes FILAMAR ESV C0348from other coreplate C-3 varnishes.

Processing

FILAMAR ESV C0348 is hot curing. Optimum curing temperature depends upon the dwell time in the furnace and must be determined for each oven separately. 

For FILAMAR ESV C0348, cure pattern is a strip temperature (PMT) of 250 °C for dwell time of 1 minute inside the curing furnace. This can however, be altered as per customer demands.

Coating Properties

Following properties are for a typical 2 micron coating thickness.

FILAMAR ESV C0348 (C-3)
Sr. No. DESCRIPTION TYPICAL PROPERTIES
1 Coating Appearance Yellow Gold
2 Insulation Resistance (For 2 microns lamination) >10-25 Ohm.cm2/lam
3 Punchability 2-3 times Bright Steel
4 Weldability NA
5 Stress Relieving Annealing (SRA) Does not withstand SRA


FILAMAR FC300 is a totally organic varnish/ enamel coating, C-3 class (ASTM 976) with outstanding punchability. It has a single component polyester/phenolic base with a cross-linker. It does not withstand SRA (Stress Relieving Annealing) treatment.

Application Range

  • FILAMAR FC300 is suitable for coating thickness of 1.5-3 microns.

  • It is designed for applications in low line speed coating systems.

  • On account of its outstanding punchability, FILAMAR FC300 is suited for high speed punching machines. 

  • Pure organic character of FILAMAR FC300 is responsible for a non-porous weld only at very low coating thickness. Weldability is poor for high thickness. 

Processing

FILAMAR FC300 is hot curing. Optimum curing temperature depends upon the dwell time in the furnace and must be determined for each oven separately. 

For FILAMAR FC300, cure pattern is a strip temperature (PMT) of 250 °C for dwell time of 1 minuteinside the curing furnace. This can however, be altered as per customer demands.

Coating Properties

Following properties are for a typical 2 micron coating thickness.

FILAMAR FC300 (C-3)
Sr. No. DESCRIPTION TYPICAL PROPERTIES
1 Coating Appearance Copper Brown
2 Insulation Resistance (For 2 microns lamination) >8-15 Ohm.cm2/lam
3 Punchability 2-3 times Bright Steel
4 Weldability NA
5 Stress Relieving Annealing (SRA) Does not withstand SRA


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