8.The results have shown that the brown alundum coatings are high-class neutral refractory coatings and are used with success in iron and steel cast-ings.

• 试验结果表明；所研究的棕刚玉涂料是一种优质的中性抗粘砂涂料；适用于粘土砂、水玻璃砂及树脂自硬砂的铸型和型芯.