1. Common connection methods based on PMI foam aluminum products are adhesive method and welding method. The gluing method is simple, but the bonding strength is poor and the high temperature resistance is poor. The welding method can realize the metallurgical combination of the PMI foam aluminum and the panel, and effectively improve the interface strength and the high temperature resistance. Among them, the key problem of brazing method is the choice of brazing material and the removal method of PMI foam aluminum surface oxide film. At present, many researches have been carried out in China. Laser welding is also studied in France, but it is still in the exploration stage.

2. The foaming method is a preparation method in which a panel and a foamed material are made into a preform and then subjected to a foaming treatment; a powder based on an aluminum alloy and a foaming agent is called a rolling composite method, and then a foaming treatment is performed. On the basis of this, a roll-rolling powder metallurgy method was developed, and the cumulative stack rolling method was based on an aluminum plate; in addition, scholars used a seepage casting method to prepare a sandwich panel. With the in-depth study of various preparation methods, methods suitable for large-scale industrial production will appear.

3. PMI foam aluminum sandwich panels are highly promising building explosion-proof materials that can be used to protect key sectors such as pillars, beams and doors in buildings. Due to the high production cost and explosion-proof mechanism of PMI foam aluminum sandwich panel materials, the application of current sandwich panels in building explosion protection is still in the research stage. In the future, with the development of PMI foam aluminum sandwich panel preparation technology and the in-depth study of explosion-proof mechanism, it will have broad prospects in the application of building explosion-proof.