Lokacin juriyar wuta na Class A kofofin wuta bai wuce 90min ba, kuma akwai ƙarfe da itace. A ciki na Class A kofofin wuta gabaɗaya ana yin su ne da perlite, da ƙaramin adadin kayan da za su hana wuta kamar allunan hana wuta na vermiculite, allon ƙofar kumfa, kayan sassauƙa na MC, da sauransu.

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