HighTemp™ Flex

About HighTemp Flex Circuits

HighTemp™ is a flexible circuit with material constructions that significantly exceed the top high temperature performance typically offered by flexible circuit suppliers. While traditional polyimide constructions are rated to perform well at temperatures up to 150ºC-200ºC, our HighTemp™ flex circuits can perform at temperatures up to 250°C.


All Flex engineers developed this capability by testing a range of materials under a variety of processing options. Premium performance in challenging environments was achieved through a combination of newly developed materials and unique fabrication processes.


Some of the markets with increasing requirements around thermal management at extreme temperatures include: down hole oil drilling, semiconductor processing, medical diagnostics and instrumentation, and a multitude of military/aerospace applications.


All Flex is one of the few companies that offers high temperature flexible circuits as well as flexible heaters with Maxi-Flex® lengths of at  lengths of six feet or more.

CharacteristicsNEW High Temp Polyimide
Temperature RangeUp to 250°C (482°F)
Resistance RangeUp to 250 ohms per square inch
Metal Thickness Range0.0005" – 0.0023"
Total Thickness Range.0035" – 0.010"
Insulation Resistance5000 – 6000 V/Mil
Example Power Densities.1 W/in2 to 60 W/in2
Resistance Tolerance+/- 10%
Standard Coverlay Thickness0.001", 0.0015, 0.002, 0.003
Leads (if required)Length/AWG/Coating Options
Minimum Bend Radius0.30"
General Chemical ResistivityBest
Out gassing / AerospaceGood
Edge Insulation0.030"
Bond/Peel Strength (to flat plate using PSA)101 oz/inch
HighTemp Flex Circuit
Features & Benefits
  • Improved thermal performance
  • Significantly higher temperature rating
  • Double sided & multilayer
  • UL rated to 94V-0 and 746F, 250°C Max operating temperature
  • Meets IPC-4204A/11
  • RoHS Compliant
  • Excellent thermal resistance
  • Maxi-flex® length available to six feet or more.