Siffar fiber yumbu shine ingantaccen kayan rufewa na thermal wanda aka yi daga Jiuqiang refractory yumbu fiber, halartar inorganic kuma dace Organic binders.Ana sarrafa cakuduwar cikin alluna ko sifofin da aka kafa waɗanda ke da ƙarfin injina mai kyau bayan dumama.Alumina fiber allon za a iya kerarre ta amfani da hudu asali fiber iri: Rarraba zazzabi 1000 ° C, 1150 ° C, 1260 ° C, 1400 ° C.