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Incombustible radio wave (RW) absorbers are developed by using inorganic carbon fiber-reinforced superlightweight polymer-modified mortars in place of conventional organic materials. The RW absorbers have a satisfactory RW absorbing performance for higher frequencies abve 30MHz. The RW absorbers can also be applied to microwave absorbers which are required to be more incombustible and to be able to absorb microwaves above 1GHz. The development of such materials makes it possible to design a highly fire-resistant anechoic chamber that has not been considered impossible to make until now.