The lightweight civil air defense door has good sealing performance, has the advantages of light weight, high strength, corrosion resistance and long service life, as well as good insulation, sound insulation and flame retardancy. It can completely replace the current reinforced concrete closed doors and all-steel closed doors. Composite material lightweight protective airtight doors are also environmentally friendly, have no maintenance costs and are easy to mass produce. They can play an important role in civil air defense construction. At the same time, composite lightweight protective airtight doors can be used to replace some old and damaged ones. Reinforced concrete closed doors are easy to install, save time and effort, and can effectively ensure the effectiveness of civil air defense projects.
A series of lightweight protective closed doors jointly developed by Shandong Xinming FRP Products Co., Ltd. and the Fourth Design Research Institute of the General Staff of the Chinese People's Liberation Army. They are used in civil air defense projects and have reached the leading domestic level according to
expert evaluations. It fills the current gap in domestic products and is a revolutionary change in the civil air defense engineering protective equipment industry. The lightweight protective airtight door of the civil air defense door is made of
composite materials and is produced using the molding process. The built-in embedded inserts are made through high temperature and high pressure, and their strength is greatly increased. The door and door frame are sealed with sealing strips, and the sealing measures are reliable
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