Mono vs Multi: The Structure Behind Recycling Performance

Multi-Layer Plastic (MLP) is widely used in flexible packaging to combine different material properties within a single structure.

In practice, MLP structures are typically designed in two forms:

• • Mono-material MLP: Multiple layers within the same polyolefin — maintaining material consistency across the structure
  • Multi-material MLP: Layers from different polymer families combined to achieve specific functional needs

From an Advanced Recycling perspective, structural design can influence recovery efficiency.

Mono-material MLP generally allow for higher and more consistent liquid yield under similar operating conditions, as they are typically composed of a single polymer family (e.g., polyolefins) that break down predominantly into hydrocarbon fractions during thermal conversion.

Multi-material MLP can also be processed through advanced recycling. While these structures are rarely compatible with mechanical recycling because they combine different polymer materials, advanced recycling provides an alternative pathway. However, when different polymer types are combined, variations in molecular structure, including the presence of elements such as oxygen or nitrogen, may influence product distribution, resulting in differences in yield and upgrading intensity depending on composition.

Under the Circular Plus by SCGC, Advanced Recycling technology helps recover value from difficult-to-recycle plastics — including certain MLP structures — within defined composition parameters

Mono and multi both have roles, but structure directly impacts recycling efficiency.

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For more information:

• • Explore our Advanced Recycling: https://www.scgchemicals.com/en/scgc-green-polymer
  • Contact us: greenpolymer@scg.com