Made of inorganic compound materials, WF-JL-SH9020 Type inorganic compound fire shutter is of fine fire-resisting properties. As the water curtain protection system for metallic rolling shutters is saved, the construction costs are greatly reduced. The results of the tests made by the National Fixed Fire-Extinguishing System Components Quality Monitoring, Inspecting and Testing center of the Ministry of Public Security (Tianjin) show the fire-resisting time period of WF-JL-SH9020 Type inorganic compound fire shutter lasts 4 hours. When used together with the JP-JL-SH9016 Type two-bus system rolling shutter controller made by the same manufacturer, it becomes a product with excellent fire-resisting properties. This product has been included in the '97 National Torch plan as a product recommend by the state for popularization of its use in China.