Does it possible to measure the absorbance of plastic sample with diameter 60mm, thickness 6mm though FTIR?

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Peter Farrington

I doubt you will get much transmission through 6mm so your options are to use ATR or prepare a thinner sample. The easiest way to prepare a thinner sample is just using a hydraulic press. In most cases you don't even need to melt the sample.

Gianluca Sarti

Uday Kumar use ATR-FTIR, no hydraulic press, no change of shape

V R Arun Prakash

Go for ATR mode of FTIR spectra.