The kinetic effect of thermal degradation of poly(vinyl butyral) (PVB)/glass ceramic and PVB/ Ag cases was analyzed and discussed using dynamic Fourier Transform Infrared (FT-IR) spectra. The analytical results revealed that both of the inorganic materials in an air environment can greatly affect PVB thermal degradation. The reaction rates and pathways of thermal oxidative degradation of PVB with each inorganic composition were altered significantly. Moreover, for the PVB with ceramic cases, most of the carbon residue was left after the first period of PVB thermal degradation and oxidized at a higher temperature, while the carbon residue of PVB/Ag cases was simultaneously burnt during the main PVB thermal oxidative degradation period. In addition, the catalytic effect of both of the inorganic materials on PVB thermal degradation was demonstrated by calculating the formation rate of the volatile gas in an air environment.