Polymethacrylimide (PMI) foam was developed in 1962 by the German company Rom (the predecessor of Degussa), industrialized in the 1971s, and used in aviation in 1972. Nowadays, the application field of PMI foam has been extensive, and other institutions at home and abroad have begun research and development of this high-performance foam in recent years.
At the same density, PMI foam has higher compressive strength and stiffness than other polymer foams, superior high temperature and humidity resistance, and better resistance to high temperature creep and dimensional stability. The heat resistance and excellent creep resistance at high temperatures enable it to withstand the high temperature curing conditions of carbon fiber/epoxy, carbon fiber/double horse resin composites, and achieve a co-curing of the foam core and the prepreg. Widely used in the manufacture of composite foam sandwich structures. In addition, since the polymethacrylimide foam is produced by a solid foaming process, the foam has a high closed cell ratio, a uniform pore size distribution, and a low moisture absorption rate. The above performance characteristics make it have broad application prospects in many technical fields such as aerospace, aviation, ship, high-speed train, wind power generation.
Throughout the domestic and international markets, the current ROHACELL of Degussa is still in a monopoly position. The model and application areas of ROHACELL are as follows:
ROHACELL Model Application
IG is mainly used in sports equipment, medical bed boards, fan blades and audio speakers. It is the most commonly used type of ROHACELL.
The mechanical properties of IG-F are basically the same as ROHACELLIG, and the pores are smaller.
A Used in the aerospace industry, co-curing process temperature pressure up to 130C/0.35 Mpa, can be co-cured with medium temperature curing epoxy prepreg
WF is used in the aerospace industry. The co-curing process temperature can reach 180C/0.7 MPa and can be co-cured with high-temperature curing epoxy prepreg.
XT high temperature resistant product, co-curing process temperature pressure up to 190C/0.7 MPa, co-curable with BMI resin prepreg
RIST is suitable for resin injection processes as a structural material
RIMA is suitable for resin injection processes as a process aid
S fireproof type for railway locomotives, ships and small aircraft
HF is mainly used for antennas, radomes, medical
Since the EC is added with carbon powder during the production of the copolymer plate, the foam can absorb radar waves and is suitable for sandwich structures with stealth requirements.