Potentiometric titration of carboxyl end groups quantifies thermal hydrolytic history in rPET lots, revealing latent processing damage and driving lot pricing.
Hydrolytic degradation thresholds require drying virgin polyesters below 0.02 percent and polyamides below 0.10 percent water before melt processing.
Extruding polyesters above 280°C demands moisture below 30 ppm to prevent ester hydrolysis, intrinsic viscosity loss, and catastrophic part brittleness.
Optimize rPET desiccant drying at 160-170°C with -45°C dew point dry air to maintain moisture under 30 ppm and prevent intrinsic viscosity drop.
Polyester moisture extraction follows temperature-dependent Fickian diffusion, requiring dew points below minus forty degrees to prevent melt hydrolysis.
Multi-party moisture disputes depend on ISO 15512 Method C baseline sampling at loading and container dew point tracking before silo transfer.
Polyethylene terephthalate ester bonds hydrolyze rapidly in melt above 270 °C, requiring drying below 30 ppm moisture to prevent intrinsic viscosity collapse.
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