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The thermal decomposition and the fire behavior of glass fiber reinforced polyamide 66 (PA-66) and high impact polystyrene (HIPS) containing red phosphorus (P4) were investigated. For glass fiber reinforced PA-66, P4 promotes char formation in the condensed phase. Barrier effects and the reduction of combustible volatiles were identified as fire retardancy mechanisms. For HIPS, P4 acts in the gas phase, mainly trapping radicals. The heat release per mass loss polymer is reduced due to an incomplete combustion.