Polyethylene composite life buoy is the high density polyethylene for shell, filling for rigid polyurethane foamed wares float into the core page, and with scientific for mule so that its color firm, and anti-oxidant prevent ageing, mechanical strength, the chemical stability is superior to all other life buoy. MSC8170 products for the production, by the People's Republic of China shipping inspection bureau approval, its quality to meet the 1974 international safety of life at sea conversation 1996 amendment requirements.