Application Note: Hydroxyl and Acid Numbers in Resin Melts with a ClearView ® db Photometer Process Analytical Systems PAGE 1 | www.guided-wave.com Purpose To measure hydroxyl and acid numbers on-line in resin melts to determine end- of-reaction across different products with a ClearView db photometer and ? ber optic probe. Approach NIR spectra were taken at 245 °C in a 1 cm cuvette using a M412 spectrometer. The data was analyzed wit

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