foam glass

noun

Definition of foam glass

: a black opaque cellular glass material ¹/₁₅ the weight of glass that is made by firing crushed glass with powdered carbon and is used as a substitute for cork, balsa wood, or kapok in life preservers and as an insulating material

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“Foam glass.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/foam%20glass. Accessed 27 Nov. 2020.

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