Ingorganic fire rate door core 1.low carbon,self-heating in production process. ... and good service. Production introduction:Inorganic Fire Rated door core is consist of expanded perlite and inorganic material.The ... install,fireproof,heat insulation and presercation.Mainly used as core of wooden fire door and steel fire door.Base ... name:jessica liutrade manager:cn220230070 Inorganic fire rate door core