Typical Flex Circuit Construction

Type I     Type II     Type III     Type IV

Type I (single metal layer)

Type I (Standard)

 .001 Kapton
 .001 Adhesive
 .0014 RA Copper
 .001 Adhesive
 .001 Kapton

Type I (Most cost Effective)

  .002 Photoimageable Coverlay
  .0014 RA Copper
  .001 Adhesive
  .001 Kapton

The thicker the copper the more adhesive that is used to conform – for example:

 .001 Kapton

 .003 Adhesive

 .010 RA Copper

 .002 Adhesive

 .001 Kapton

Kapton can also be thicker for better insulating properties – standard thicknesses are:

001, .002, .003, and .005.

Thinner constructions are also readily available although the cost is higher.

 .0005 Kapton  

 .0005 Adhesive

 .0007 RA Copper

 .0005 Adhesive

 .0005 Kapton

 .0015 PIC

 .0007 RA Copper

 .0005 Adhesive

 .0005 Kapton

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