Definition of alumina trihydrate
: the trihydrate of alumina Al(OH)3 used primarily for its flame-retardant properties The influence of the inorganic flame retardants, including alumina trihydrate (ATH) and borax … on the mechanical properties and flammability of high density polyethylene has been studied. — Journal of Technology and Science, 9 May 2010 ◆At approximately 350 degrees Fahrenheit, Al(OH)3 decomposes to Al2O3·3H2O, absorbing heat and releasing water vapor. —abbreviation ATH — compare aluminum hydroxide
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