Acoustic Absorbing Material for Exhaust Applications
|Publication Date:||1 September 2018|
Material Description. This specification describes three (3) types of fibrous glass materials typically used in silencer components of exhaust systems. The materials are classified as Type 1 for moderate-temperature
• Type 1, or moderate-temperature
• Type 2, or high temperature applications, are those applications where the fibrous material itself will achieve continuous operating temperatures of +825 °C or intermittent temperatures as high as +900 °C for up to 2 h. This material is suitable for virtually all applications toward the rear of the exhaust system and near the catalytic converter.
• Type 3, or intermediate-tempera
Note: For many silencer applications in continuous operation, the glass temperature adjacent to the perforation tube is ≥ 50 °C under the exhaust gas temperature. For cyclic operations of a few minutes duration, this temperature differential is larger.
Symbols. Not applicable.
Applicability. These materials are typically used in exhaust systems where thermal insulation and/or acoustic attenuation are required. The choice of materials is primarily determined by the maximum operating temperature that the material will achieve.