Rubber compounds can change and decompose when exposed to severe heat. Burning behavior and smoke generation depend on the formulation, temperature, oxygen supply and other test conditions.
A cured rubber component should not be assumed to behave like a melting thermoplastic. Nor does a high operating-temperature rating establish flame resistance or low smoke generation.
When fire performance matters, specify the required test method, classification and component thickness. Request evidence for the proposed compound and confirm the scope of the test. Any smoke or other application-specific requirement must be assessed separately. Generic descriptions of polymer combustion cannot establish the suitability of a grommet for a fire barrier or safety-critical assembly.
