Desorption testing above 160 C triggers solid phase transesterification, generating chemical water that falsifies polyester moisture readings and causes under-drying.
Controlling micro-zone hydrolytic degradation in PET extrusion requires suppressing boundary-layer moisture below 30 ppm and limiting local shear heating spikes.
Coulometric Karl Fischer testing with oven desorption at 170 °C isolates true water content in rPET below 50 ppm, preventing costly IV degradation during melt processing.
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