Shock & impact Absorbing Foam | General Plastics
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Energy Absorption Low-Density Foam

EF-4000 Energy Absorption Low-Density Foam

The LAST-A-FOAM® EF-4000 series is focused on provided outstanding protection through impact and shock absorbing foam. They exhibit relatively “flat” load-deflection curves, absorbing energy while exposing delicate parts to consistent lower-level stresses. These foams are manufactured in the density range of 3 to 5 lbs. cubic foot. This material can provide superior vibration damping and cushioning for loads in the 0.1 to 2.0 psi static stress load range. They are available as flexible polyurethane foam sheets and blocks.

Shock Absorbing Polyurethane Foam

This extremely durable polyurethane foam series is formulated to absorb applications below 180°F. For a flame-resistant version, specify LAST-A-FOAM® EFR-400x formulations. In aerospace and defense applications, EF-4000 flexible foams have been used extensively as “spring-damper” shock isolation systems to protect missiles in underground silos and nuclear submarine launch tubes. These products have been used extensively in the Polaris and Trident programs for padding on the closures of missile nose cones. They have also served as packaging and support pads for the Air Launch Cruise Missile (ALCM) and been used in the Minuteman and Peacekeeper programs.

In construction, these flexible urethane low-density foams serve as shock-isolation systems for earthquake-prone buildings. They also provide shock mounts and pads for delicate equipment in shipping containers and vibration damper pads for mechanical equipment.


  • Superior vibration isolation and cushioning (0.1 to 2.0 psi static stress load range)
  • Extremely long-lasting
  • Relatively unharmed by environmental factors
  • Absorbs significant energy while protecting payloads
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  • Underground missile silos
  • Nuclear submarine launch tubes
  • Shock-isolation systems for earthquake-prone buildings
  • Shock mounts and pads for shipping delicate items
  • Vibration damper pads for mechanical equipment


ProductsDensity (lbs/ft3)HeightWidthLengthRequest a Quote
EF-40033164872Quote »
EFR-40044164872Quote »
EF-40055124870Quote »


ProductsDensity (kg/m3)HeightWidthLengthRequest a Quote
EF-40034840121182Quote »
EFR-40046440121182Quote »
EF-40058030121177Quote »

Shown are maximum standard stock based on density. Custom sizes are available. Cut sizes are available from 0.125 inches (3.175mm) up to standard stock heights as listed above

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