AFXB3 is uniquely suited for environments where temperatures are high, sparks or other hot materials may fly, large numbers of people congregate, or high technology is used. It withstands constant temperatures up to 320°F, as well as meeting all Class 1 regulations for flame spread, smoke density, and fuel contribution. The materials are constructed of lightweight, porous acoustic melamine. The material's internal structure is a spacious cellular complex of slim, flexible webs. These elastic filaments are fiber-free and completely open-celled.