铜陵凤凰山铜矿在新明井的改造中，首次将阻燃玻璃钢板作为井筒的隔离材料，经生产实践的检验初步获衍了成功，使这一新型材料应用范围进一步扩人。新明井原设计为罐笼井，经改造后，实际变成一个混合井，根据冶金矿山安全规程要求，井筒必须进行隔离。采用什么样的材料作为箕? In the reconstruction of Xinmingjing, Tongling Fenghuangshan Copper Mine, for the first time, made the fire retardant glass steel plate as the isolation material of the wellbore, and obtained preliminary success after the test of production practice, further expanding the scope of application of this new type of material. Xinmingjing was originally designed as a cage well. After its transformation, it actually turned into a hybrid well. According to requirements of the safety regulations for metallurgical mines, the wellbore must be isolated. What kind of material used as Kei?