Ƙofar wuta ta Grade C ba za ta kasance ƙasa da 0.6h ba. Za a sami wani Layer na feshin electrostatic a saman, kuma cikin ciki yana cike da ba mai guba ba kuma mara lahani da kayan kariya na thermal. Mai cika ƙofar hana wuta ta Grade C shine perlite da siminti kayan hana wuta waɗanda suka dace da kariyar muhalli da ka’idodin kariyar wuta.

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