Nonflammable PF panel PF Panel has been developing in the past three years with our R&D team. With its unique features, PU Panel satisfies most of the wall panel requirements including high thermal insulation, sound insulation and fire rated ability. Nonflammable material. flame resistance paper honeycomb cleanroom panel‧flame resistance aluminum honeycomb cleanroom panel‧1 and 2.5 hours fire rated rock-wool panel