mineral wool

American  

noun

1. a woollike material for heat and sound insulation, made by blowing steam or air through molten slag or rock.

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mineral wool British  

noun

1. Also called: rock wool.  a fibrous material made by blowing steam or air through molten slag and used for packing and insulation

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Etymology

Origin of mineral wool

First recorded in 1880–85

Example Sentences

The angled roof is made out of a reflective, resin-coated metal and sits atop 9 inches of mineral wool insulation, which helps preserve the building’s interior temperatures and buffer external noise.

From Los Angeles Times

From her front yard, Keisha Brown can see the unsightly berms of mineral wool, a byproduct of the coking process.

From Washington Post

Moreover, Rockwool’s mineral wool manufacturing process constantly releases hundreds of quintillions of tiny particles that cause respiratory inflammation, which can lead to infections and lung cancer.

From Washington Post

Instead, vegetables sprout in small cubes of mineral wool placed in trays of water, with water-soluble fertilizer helping them grow.

From Washington Times

Various non conducting substances are employed to prevent radiation, as, for example, felt, mineral wool, asbestos, and various kinds of cement.

From Project Gutenberg