A2 fire resistance rating is one of the highest requirements for non-combustible materials in GB 8624-2012 Classification of Combustion Performance of Building Materials and Products. It indicates that the material hardly participates in combustion under high-temperature flames, has no sustained smoldering, extremely low smoke toxicity, and a very low heat release rate.
When used on the exterior facade of a hospital outpatient building, the metallic coating has a delicate matte texture under sunlight, unlike traditional aluminum panels which are reflective and glaring, or stone which is heavy and oppressive. It is light yet sturdy; after installation, the joints are smooth and seamless, there are no unusual noises when the wind blows, and watermarks slide off easily after rain, leaving no stains on the surface. When the school building had wainscoting installed, the construction team completed the renovation of the entire south-facing exterior corridor in three days, without affecting the children's classes. Teachers passing by even praised it, saying, "It makes me feel at ease." The aluminum substrate combined with a polymer coating structure gives the panels both the sleek lines of metal and the flexibility and impact resistance. Rounded edges were used at the corners of the hospital corridors to prevent the coating from peeling or showing white edges after impacts. Daily cleaning is as simple as wiping with a damp cloth, and fingerprints and oil stains disappear completely. There's no pungent odor, and no worries about paint peeling later on; it's like giving the building a discreet yet reliable protective coat.
