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Reference.org
Tetrakis(hydroxymethyl)phosphonium chloride
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<p>Tetrakis(hydroxymethyl)phosphonium chloride (THPC) is an <a href="/facts/Organophosphorus_compound/kNgIF93U">organophosphorus compound</a> with the chemical formula [P(CH2OH)4]Cl. It is a white water-soluble salt with applications as a precursor to fire-retardant materials and as a microbiocide in commercial and industrial water systems. </p>