Prepreg is the English short form for "preimpregnated fibers". (Source: Wikipedia)

Prepreg is used in motorsports, sports equipment construction and in space travel. The reason for this is the highest possible material performance and the resulting very low mass. At least an oven and a vacuum pump is necessary for the processing. An autoclave would be optimal because it can generate additional pressure. This means that only the amount of matrix in the fiber composite is absolutely necessary.

The price of the material and the availability of the devices are of course disadvantageous. The surfaces also need minimum rework.

Prepreg is available for various curing temperatures. Low temperature prepreg is usually baked at 70 - 80 ° C. Conventional mostly between 120 - 140 ° C. High temperature prepreg can be found at 180 ° C and more, but is particularly cost-intensive.



  • Autoclav
  • (Vacuum pump and oven)


Consumable material:

  • Prepreg
  • Disposable gloves
  • Vacuum bagging film
  • Peel ply (Temperature-resistant)
  • Release film (Temperature-resistant)
  • Breather & Bleeder (Temperature-resistant)
  • Sealant Tape
  • Vacuum tube (Temperature-resistant)
  • Spray adhesive



  • Applying the release agent on the mould
  • Laminate layers (self-adhesive at room temperature)
  • Apply peel ply with spray adhesiv on laminate layer
  • Repeat the process with release film and Breather & Bleeder
  • Introduce vacuum connection
  • Choose a vacuum bagging film large enough and close it
  • Apply vacuum
  • Set temperature and pressure profiles according to the prepreg data sheet!
  • After the parts have cooled down, demould and cut
Faserverbundaufbau; Lagenaufbau; Harzinfuionsaufbau
Faserverbundaufbau; Lagenaufbau; Harzinfuionsaufbau