Aim\ To cover the preparation of red phosphorus based microcapsule fire retardant by in situ polymerization and the fire retardation of HDPE/red phosphorus based microcapsule fire retardant. Methods\ Physical properties of red phosphorus based microcapsule fire retardant were tested. Results and Conclusion\ Stability
water absorbing capacity
yield of PH\-3 and other physical properties of red phosphorus based microcapsule fire retardant are superior to bare red phosphorus. Properties of HDPE/red phosphorus based microcapsule fire retardant are also better than HDPE/bared red phosphorus fire retardant.