one component expanding pu foam is used preferably for maintainence and repairing in the installation and the construction sector,it has the polyurethane prepolymer and the foaming agent,the catalyst,soaks the medicinal preparation and the chemical additive uniform and so oninstalls in the potfilling with gas turbo-charged makes.after the solidification,it has the sealing,the heat preservation,the caking,sound-insulating,waterproof and other functions.