Exploring the effect of melamine pyrophosphate and aluminum hypophosphite on flame retardant wood flour/polypropylene composites

•Incorporation of MPP and AHP into the PP/WF composite significantly improved the thermal stability and char forming ability.•PHRR and THR of the PP/WF composite reduced remarkably by the addition of MPP/AHP.•The system of MPP/AHP was equipped with perfect effect of gas phase and condensed phase flame retardancy.