HEAT-RESISTANT FLAME-RETARDANT SOUND ABSORBER

PROBLEM TO BE SOLVED: To provide a highly flame-retardant, heat-resistant and sound-absorbable sound absorber without heat shrinkage or wear even if it is repeatedly exposed to high temperatures for long hours in an automobile engine room.SOLUTION: A heat-resistant flame-retardant sound absorber includes a nonwoven cloth of 5-50 mm in thickness provided with a binder of 30-200 dry g/m. The binder is made by blending a phosphorus-based flame retardant into a nonwoven cloth with a weight of 200-2000 g/m, which is made from polyester fiber in 80-50 weight% and polyphenylene sulfide fiber in 20-50 weight% which are subjected to a processing of cotton blending-carding-wrapping-needle punching. The nonwoven cloth has 50% or more of tensile strength and elongation and 5% or less of thermal shrinkage in the condition where the cloth is cooled down to room temperature after being left under atmosphere of 200°C×500 hours.