MPR Refractories Ltd. Manufactures Zircon Bricks for Bottom Paving. MPR Refractories Ltd. Is an ISO 9001:2008 certified company. MPR Refractories Ltd. Offers Slide Gate Plates, Collector Nozzles, Ladle Nozzles, Porous Plugs, Tundish Nozzles, Well Block for Porous Plugs, 90 K Mortar, 95 H Castable, Tundish Boards, Packing & Sealing Compounds, etc. The Zircon Bricks of model number MPR -ZB is used bottom paving and other locations of glass tank furnace.