NC- and PU-based color systems

Impacts in the context of recyclability

The further development of the specifications for recyclable packaging is increasingly focusing not only on the material composition but also on the printing inks. For example, nitrocellulose (NC)-based printing inks are classified as non-recyclable under certain conditions in the German minimum standard. Below you will find the FAQ on the most relevant topics. The information is based on our exchange with packaging licensees, recyclers and printing ink manufacturers.


Last updated: March 21, 2025

Colour systems at ppg >


Due to our expertise in food packaging solutions, we use both NC and PU-based colour systems. Therefore, we have the necessary experience in processing both systems in our printing processes.


Since the color effect of individual tones differs in the systems, it is possible that the overall impression of a motif will change when switching from an NC-based to a PU-based ink system. In most cases, switching has shown that good results can be achieved with existing print media.

FAQ

The minimum standard 2024 classifies NC-based inks in interlayer printing for the entire fraction PE-flex as not recyclable on page 35 (see below). Since 2024, a distinction based on packaging size (< or > DIN A4) has only applied to sorting fractions, not to recycling incompatibilities.

As of version 2024, the entire fraction PE-Flex is affected by the change. This includes the following laminates, provided they are interlayer printed:

  • boPP/PE
  • boPP/PE-EVOH-PE
  • mdoPE/PE
  • mdoPE/PE-EVOH-PE
  • boPE/PE
  • boPE/PE-EVOH-PE

The currently known versions of the packaging specifications from the food retail discount sector are essentially based on the “EuPIA GPM” standard. Furthermore, “NC colors in individual cases” can be accepted. Since retailers generally also use the minimum standard as a reference, it can be assumed that adjustments will be made this year in line with the 2024 german minimum standard.

Exemplary example

  • The picture shows different results that can occur when changing the color system.
  • The decision as to whether a motif or its printed media is suitable for use with PU inks can only be made on a case-by-case basis.
  • Deviations in colorusually run unevenly depending on the composition of the colors & condition of the printed media.

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