The steel cylindrical casings using fire proof material,also heat insulating material interiorly, which forms fire-proof structure. 钢板制成的圆筒外壳中使用了耐火材料，内部也贴有绝热材料，形成耐火结构。
The coatings film will be dilatated when contacted to fire, forming a high dense and microporous fire proofing layer to prolong the fire retardant limit of steel structures. 由该涂料制得的涂层遇火发泡膨胀，形成具有一定厚度的密实微孔状阻燃层，从而提高了钢结构的耐火极限。
