glass wool

noun

: glass fibers in a mass resembling wool and being used especially for thermal insulation and air filters

Examples of glass wool in a Sentence

Recent Examples on the Web One of them was completely enclosed within a hefty capsule of cork, coiled wire, glass wool, and steel, through which no electromagnetic radiation could pass; anyone living inside was completely cut off from the Earth’s magnetic field. —

Jo Marchant, Wired, 1 Sep. 2020

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