also: ロック・ウール
rock wool; mineral wool
A fibrous insulation material made from molten rock or slag. Used in construction and horticulture. The Japanese term 岩綿 (がんめん) is a synonym.
See also: 岩綿 (がんめん)
Rock wool is often used as insulation material.
In hydroponics, rock wool is sometimes used as a growing medium.