Ny fitaovana fototra amin’ny varavarankelin’ny afo dia ny birao volon’ondry mineraly, ny birao gypsum tsy misy afo, ny birao mitsingevana ary ny birao vermiculite, izay manana fiasa isan-karazany. Ny varavaran’ny afo vita amin’ny hazo dia mahasarika ny tontolo iainana ary manana fetran’ny fanoherana ny afo.

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