rock wool
Definition
Noun: A manufactured, lightweight, fibrous material made from molten rock (typically basalt or diabase) or industrial slag that is spun into fine, wool-like strands. It is primarily used for thermal insulation, acoustic insulation, and as a growth medium in hydroponics due to its fire-resistant and inert properties.
Usage
"Rock wool" is a non-count noun. It refers to the insulating material as a substance or product, not to individual pieces. * The attic was insulated with a thick layer of rock wool. * Rock wool is effective at reducing heat transfer and muffling sound. * For this experiment, we will plant the seeds in cubes of rock wool.
Examples
- The contractor recommended rock wool for the exterior walls because of its excellent fire rating.
- When handling rock wool, it is advisable to wear gloves and a mask to avoid irritation from the fibers.
- Compared to fiberglass, rock wool has a higher density and provides better soundproofing.
Advanced Usage
- "Mineral wool": This is a broader category that includes rock wool and slag wool. In many technical and commercial contexts, "mineral wool" is used interchangeably with "rock wool," though rock wool is a specific type made from natural rock.
- As a growth substrate: In horticulture, "rock wool" specifically refers to the processed cubes or slabs used to support plant roots in soilless cultivation.
- The tomatoes are thriving in their rock wool slabs, receiving nutrients directly through the irrigation system.
Variants and Related Words
- Mineral wool (n): The general term for insulation wool made from molten mineral materials, encompassing rock wool and slag wool.
- Stone wool (n): Another term for rock wool, commonly used in some regions and industries.
- Slag wool (n): A similar fibrous insulation material made from the slag, a by-product of metal smelting, rather than natural rock.
Synonyms
- Mineral fiber insulation
- Stone wool
Related Phrases/Compounds
- Rock wool batt: A pre-cut, flexible section of rock wool insulation, typically used between wall studs or floor joists.
- Rock wool board: A rigid or semi-rigid panel of compressed rock wool fibers, used for insulating walls, roofs, and facades.
- Rock wool slab: Similar to a board, often used in horticulture or for specific insulation applications.
Noun
-
a light fibrous material used as an insulator
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