Type And Temperature Resistance Of Filling Cotton Inside Exhaust Muffler Exhaust muffler is an indispensable part of the internal combustion engine emission system such as automobiles and motorcycles, which is mainly used to reduce exhaust noise and eliminate harmful substances in the exhaust gas after combustion. The internal structure of the exhaust muffler usually consists of a metal housing and a filler material, which plays a crucial role in the performance of the exhaust muffler. As a common exhaust muffler internal filling material, its type and temperature resistance have a direct impact on the performance and service life of the exhaust muffler.