Properties

• 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

Advantages

• 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