KERATHERM® standard silicone-free films

Silicone-free thermally conductive films

Silicone-free films for high vibration and movement loads

U series

The U range of standard, silicon-free films: a ceramic-filled polyurethane film makes a good alternative for silicone-sensitive applications. In addition to effective thermal and exceptional electrical properties, these films also impress thanks to their excellent perforation strength.

Possible applications: Applications in medical technology, laser equipment, lighting systems, CD ROM drives and aerospace technology.


  • Smooth surface
  • Also excellent properties at lowest contact pressure
  • Low hardness
  • High self-adhesion without adhesive
  • UL-listed


  • Effective insulation characteristics
  • Thermally conductive
  • Good compressibility
  • Fully cross-linked
  • Versatile
  • Environmentally friendly
  • RoHS-compliant


  • Power supplies
  • Automotive, motor controllers
  • LCD displays
  • White goods
  • Audio and video components
  • Power converter

Film options

  • Optional single-sided adhesive coating
  • Special thicknesses available
  • Supplied on roll or as ready-punched products
  • Fiber glass reinforcement available
Standard silicone-free thermally conductive films
Film   thermal conductivity W/mK thermal resistance K/W breakdown voltage kV measured thickness mm hardness Shore A characteristics
U 90 silicone free 6.0 0.082 4.0 0.200 70 - 85 silicone free, high thermal conductivity
U 85 silicone free 3.0 0.165 6.0 0.200 70 - 85 silicone free, high thermal conductivity and high isolation
U 80 silicone free 1.8 0.20 4.0 0.150 80 - 90 silicone free