How do adhesives affect packaging recycling streams?

Adhesives can affect packaging recycling streams by leaving residue on the container after label removal, which can contaminate recycled material if not adequately washed away during processing, with water-soluble adhesives generally regarded as more compatible with standard recycling wash processes than some permanent synthetic adhesives.

During recycling, containers typically pass through a hot-wash stage intended to remove labels, adhesive residue, and other surface contamination before the base material is reprocessed. Water-soluble glue, as used in traditional wet glue labelling on glass bottles, is generally well suited to this stage, since it dissolves and washes away cleanly, leaving minimal residue on the glass being reprocessed. Some permanent acrylic adhesives used in self-adhesive labelling are more resistant to this wash process and can leave a stickier residue that requires more aggressive processing to fully remove, potentially affecting downstream material quality if not managed properly by the recycling facility.

In-mould labelling avoids this consideration entirely by using no adhesive at all, since the label is fused to the container during moulding rather than bonded afterward. For applied labels where adhesive is unavoidable, some adhesive formulations are specifically developed to be more washable or recycling-compatible than standard permanent adhesives, and certification programmes such as APR increasingly evaluate the full label-adhesive-container system together rather than any single component in isolation, since the interaction between all three determines real-world recycling performance rather than the adhesive alone.