Gap Fillers - MH&W Thermal Products

Keratherm Softtherm

Keratherm and Softtherm sheets are filled and highly elastic. Their good compression behavior and good forming capabilities guarantee that rather large component differences can be compensated for. They are electrically insulating and possess gradual heat conductivity. Depending on the type, the sheets have varying self-adhesive behaviors. Softtherm films should not be compressed beyond 30% of the original thickness, because this may cause the films to bleed out.

Kerafol offers two types of Softtherm films. One is based on a fiber glass-reinforced carrier sheet, while the other type contains the fiber glass reinforcement directly in the sheet.

Types 86/200, 86/250 and 86/255 have a fiber glass-reinforced carrier sheet with very good thermal characteristics. A Softtherm application guarantees outstanding compressibility and formability. These Softtherm types can be provided with an adhesive application on the carrier sheet side. The mounting position of the film is determined by the carrier sheet and should always be mounted to the heat sinks or housing. This also guarantees that the formability will work effectively with the electronic components.

Softtherm films 86/120,  86/225, 86/300, 86/320, 86/500, 86/600 and U 281 are reinforced by fiber glass fabric at thicknesses of 0.5 to 1.0 mm. Starting at a thickness of 1.5 mm, they are also offered without reinforcement. With the exception of 86/225, the films can additionally be offered with an adhesive application as an assembly aid. Other than for those films with an adhesive application, the mounting position does not need be specified. In case of an adhesive application, make sure that the adhesive coating is always applied to the heat sink or the housing.


  • compensates component size variations
  • optimized thermal transition
  • good compression behavior
  • UL-listed


  • RD-RAM memory model
  • heat pipe thermal solutions
  • automotive engines
  • control units
  • plasma supply panels


  • highly flexible film
  • outstanding flexibility
  • graduated thermal conductivity
  • good electrical insulation
  • high temperature stability

Film Options

  • single-sided adhesive surface
  • single-sided adhesive coating possible
  • can be supplied in sheets or punched
  • wide variety of deliveryforms