The high rate fire proof expansion seal series proucts are from the latest technology research and development of the Sino German joint technology,unique aggregate component(not fly ash),heat insulation component(low thermal conductivity)and so on.It can expand to more than 30 times of the original volume when encountering fire and hert.It can fully fill the fierproof window cavity and keep the integrity of the fire window.So as to form a strong fire barrier,instantly create an independent safety space to ensure personal safety.