Abstract
Rigid polyurethane foams (PUF) have been modified with flame retardants (inorganic salts and phosphonous acids) formed from hypophosphorous acid. Certain physical and mechanical properties and flammability of PUF have been studied. These modifiers are compared with respect to their effectiveness as flame retardants for PUF both with one another and with trade materials Fyrol 6, Fyrol CEF and di-ammonium hydrogen phosphate. The effectiveness of flame retardants is also estimated mathematically according to the equation of Zabski-Jedlinski.
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