Definition
A soft, spongy form of rubber filled with countless tiny air pockets, used in aircraft for cushioning, padding, vibration damping, and sealing. It is produced by whipping air into liquid latex (or chemically generating gas inside the rubber) before it cures, leaving a flexible, lightweight cellular structure.
Plain English
Rubber that has been puffed up with air bubbles so it is soft and squishy, like the foam inside a seat cushion. It is light, springy, and good at absorbing pressure or vibration.
Context Anchor
Seen in aircraft maintenance, cabin interior work, seat cushions, padding, and protective seals.
Derivation
‘Foam’ comes from the Old English fām, meaning froth or bubbles. The name describes exactly what the material is — rubber that has been turned into froth and then set in that form.
Why Pilots Care
Used where comfort, light weight, and compliance with cabin fire-resistance requirements are needed.
Analogy
Foam rubber is like a sponge made from rubber: light, flexible, and full of tiny spaces, but able to spring back after being pressed.
Intuition Check
Foam rubber does not mean loose soap-like foam. It means a solid, flexible rubber material with tiny pockets inside it.
Example Sentence 1
The mechanic replaced the worn foam rubber in the pilot's seat cushion to restore proper support and impact protection.
Example Sentence 2
Mechanics installed foam rubber strips to reduce vibration along the floor panels.