GST rate on refractory ceramic goods applies until the prescribed date, excluding products of siliceous origin. GST applies to other refractory ceramic goods-such as retorts, crucibles, muffles, nozzles, plugs, supports, cupels, tubes, pipes, sheaths and rods-under the relevant schedule at the stated rate until the notified cut-off; goods of siliceous fossil meals or similar siliceous earths are expressly excluded from this entry.