99 castable is the highest quality currently recommended american south and sms demag company slab continuous casting and rolling line of unshaped refractory castable, raw materials are produced by america owned enterprises in china three, two aluminum oxide content is about ninety-nine percent, the copper rod is zero pollution, erosion resistance, long service life, antioxidant, the indicators have reached or exceeded similar foreign products, applicable to the upper and lower groove and the groove cover.