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FTIR charts, what`s the material?

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mjc123:
O2 in infrared?
Frequency is reported as 2061 (Raman).
Sample 2 melts at about 220°C. I'm thinking sample 1 is Nylon 6,6 and sample 2 is PBT. Or are you saying they are related (e.g. one is a precursor or decomposition product of the other)?

wildfyr:
Oooooops I meant co2

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