Max Wedge is designed for controlling low frequency sound. Withstands constant temperatures up to 320°F, as well as meeting all Class 1 regulations. This material is used in anechoic chambers, sound testing facilities, recording and broadcast studios or anywhere maximum absorption is required. FireFlex 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.