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Formed by mixing isocyanate and a polyether polyol containing a
halogenated hydrocarbon agent. Mixing releases heat, causing the foam to
expand as much as 30 times the original volume of the liquid. The foam,
which becomes cellular and rigid within minutes, is heat resistant and
essentially impervious to air and water, and has substantial binding
strength. Its characteristics suggest possible uses in mining for
insulation, stoppings to control ventilation, and seals to control water
and to consolidate broken ground. Encyclopaedia Britannica
Source:
Dictionary of Mining, Mineral, and Related Terms
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