FTIR can identify unknown plastic materials by comparison with known materials (i.e. from a spectral library).

 

 

 

Fig. A – Sample A FTIR spectrum compared with Nylon 6/6 and Nylon 6/9. Part of the spectrum
is more similar to Nylon 6/6 and part is more similar to Nylon 6/9.

 

 

 

 

 

  This is the Fourier Transform Infrared (FTIR) spectrum of an unknown plastic (bottom) compared with library spectra of Nylon 6/6 and Nylon 6/9 respectively.  The spectrum suggests that this is likely a blend of Nylon 6/6 and Nylon 6/9.

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