The flammability and thermal stability of ammonium polyphosphate-treated flame-retarded sawdust boards were compared with those also containing 5A zeolite and 5A zeolite that had been impregnated with 4-picolinic acid. This comprehensive study was performed using cone calorimetry, thermogravimetric analysis and scanning electron microscopy. The results demonstrated that acid-treated 5A zeolite, which was incorporated into ammonium polyphosphate-based flame-retardant systems, showed superior performance to ammonium polyphosphate being used alone...
