Engine Encapsulation

Engine encapsulations made of Trocellen PP foam are used as acoustic absorber in the engine compartment.


PP foam sheet vacuum formed into box shape
Sound absorption using the principle of a Helmholtz Resonator – high and low frequencies:

  • The sound stimulates the membrane of the box
  • The membrane oscillates like a spring on the air cushion
  • big boxes absorb deep frequencies
  • small boxes absorb high frequencies


  • Media resistance against petrol, diesel, oil etc. even when surface is damaged (due to closed cell structure)
  • PP foam absorber made of one material layer
  • PP foam absorber and carrier made of same material