Century Dictionary and Cyclopedia
- n. A white fibrous material made by blowing a stream of air or steam through molten slag as it comes from the blast-furnace or other metallurgical process. Usually known as mineral wool.
“Put the seed in a growth medium (soil or rock-wool), approximately the size of the seed under the surface (about 5 mm).”
“Vermiculite and possibly some rock-wool insulating materials may contain asbestos, a known health hazard.”
“This the main reason we use insulating rock-wool and NOT reflective tin-foil in our roofs!”
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