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 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.
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