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PIGMENTS (organic, mineral)
acceptable defects
in color
Optimized resins use an additive that act as a
(trans)-esterification catalyst and provides a color
blue shift and reduced levels of acetaldehyde.

During processing, PET is subjected to:
undesired side-products
discoloration and
hydrolytic/thermal degradation

that leads to changes in:
discoloration of bottles
mechanical properties
thermal dimension stability
quality consistency (off-spec. production)
quality of packaged beverages