Corona resistance polyimide films ,not only with ordinary polyimide film electrical properties, good heat resistance and resistance chemicals, but also with the super corona resistance and good thermal conductivity performance, mainly apply to sintering electromagnetic winding wire ,traction motor, wind generators, and the special motor turn-to-turn insulation and heat insulation, the heat resistance level is a class C.

The technical requirements

1. Type
CR type: Corona resistance polyimide film without any coating
FCR type: Corona resistance polyimide film with F46 single side coating
FCRF type: Corona resistance polyimide film with F46 double side coating

2. Appearance
its appearance is golden brown, translucent, the surface is bright and clean, no wrinkles, tear, particles, bubble, pinhole and foreign material defects. Its edge is tidy, and without damage.
3. Thickness and allowable deviation

Model	CR type	FCR type	FCRF  type
Thickness(um)	25	38	50
Allowable deviation(um)	±2	±3	±3

Note: coating thickness may be based on customer demand in 5 ~ 12.5 um range regulation.
4. Width and allowable deviation
Width may cut according to the customer request within 600 -1050 mm. Each volume length is for 500-1000 m; Each volume joints for final product are not more than three, the proportion of volumes with joints vs the total volumes number in the one order is not more than 25%,the shortest length is more than 300 m; Single plate or roll products joint numbers are not more than three, the shortest length is more than 300 m.
FCR type and FCRF type using thermal bonding lap.
5. Film marks:
-Every single volume label marked: batch number, specification, net weight;Every single plate or roll labeling: specification.
-Package should have obvious and firm mark;
-The format of the packing cases is confirmed by purchase order related terms.

Serial Number	Type	CR	FCR
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