Sound Insulation products are absorptive products that are3 made of Polyurethane - Polyether or Melamine foams. All open cell foams are absorptive and will give good acoustical results. These products can be convoluted to various decorative and acoustically functional facings. These acoustic foam absorbers typically carry an NRC number that shows what percentage of absorption the various products have at certain key frequencies. Be sure you understand that Melamine foam is the only true Class A-1 ASTM - E84 Non flammable foam. All others are somewhat flammable and should not be used where fire or building codes require a
Class A-1 finish.