Polymethacrylimide foam (PMI) refers to a foam in which the main molecular chain is a C-C chain and the molecular side chain contains an imide structure, which can be produced by various methods. The foam is the heat-resistant foam (180-240 ° C) with the highest strength and stiffness, which can meet the requirements of medium-high temperature, high pressure curing and prepreg process. It has good compatibility with various types of resins and is suitable for use as a core material in high-performance sandwich structures.

It can replace honeycomb structures, and is isotropic and easily machined into various shapes and shapes. It does not contain any Freon, is an environmentally friendly material, and its fire performance reaches FAR 25.853 and AITM. It represents the latest development of high performance polymer structural foam.