Civil air defense doors have good sealing performance and have the advantages of light weight, high strength, corrosion resistance, long life, etc., 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 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 are used to replace some old and damaged reinforced concrete. Sealed doors are easy to install, save time and effort, and can effectively ensure the effectiveness of civil air defense projects.
The series of lightweight protective closed doors jointly developed by Shandong Xinming Fiberglass Products Co., Ltd. and the Fourth Design Research Institute of the General Staff of the Chinese People's Liberation Army are used in civil air defense projects. According to expert evaluation, they have reached the leading domestic level, filling the current domestic market. The blank of M products is a revolutionary change in the civil air defense engineering protective equipment industry. The lightweight protective closed door of the civil air defense door is made of M composite material and produced using the molding process. The built-in embedded insert is made by M high temperature and high pressure, which greatly increases its strength. The door and door frame are sealed with sealing strips, and the sealing measures are reliable.
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