Definition

Noun: * A soft, lightweight, and spongy material made from rubber that has been processed to contain many small air bubbles. It is valued for its cushioning, comfort, and insulating properties and is commonly used in mattresses, pillows, seat cushions, and padding.

Examples

• The old sofa was refilled with new foam rubber to make it more comfortable.
• For the science project, she used a block of foam rubber to demonstrate sound insulation.
• Many yoga mats are made from a type of foam rubber for cushioning and grip.

Usage

• Foam rubber is an uncountable noun. You refer to a piece, block, sheet, or layer of foam rubber.
• It is primarily used to describe the material itself, not a specific manufactured object. The objects made from it are described separately (e.g., a foam rubber pillow, a foam rubber mattress topper).

Advanced Usage

• In technical or manufacturing contexts, foam rubber may be specified by its density (e.g., high-density foam rubber) or process (e.g., latex foam rubber, polyurethane foam rubber).
• The term can be used attributively (functioning like an adjective) before another noun to describe what something is made of or its characteristics: .

Variants and Related Words

• Foam (noun/verb): A broader term for any lightweight, porous mass of bubbles. Foam rubber is a specific type of foam. (e.g., ).
• Sponge rubber (noun): A very similar, often synonymous term for soft, porous rubber.
• Latex foam (noun): A specific type of foam rubber made from natural or synthetic latex.
• Polyurethane foam (noun): A very common synthetic polymer foam used for similar purposes; often colloquially called foam rubber.

Synonyms

• Spongy rubber
• Cushioning foam
• Cellular rubber

Related Phrases/Compounds

• Foam rubber mattress: A mattress whose core is made from foam rubber.
• Foam rubber insulation: The use of foam rubber sheets to provide thermal or acoustic insulation.

Noun

1. spongy rubber; made by introducing air bubbles before vulcanization and used for cushioning or upholstery