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Pyrolysis and depolymerization show up in a lot of corporate sustainability announcements, often described as if commercial-scale chemical recycling is already solving the plastic waste problem. The reality is more mixed: some pathways are proven at meaningful scale, others remain pilot or early-commercial, and the distinction matters a great deal if you're making sourcing decisions based on this material.
What's working at scale
Depolymerization of PET back to its monomers is the most mature chemical recycling pathway, with multiple commercial-scale facilities in operation. Because PET's depolymerization chemistry is well understood and the feedstock (bottles, in particular) is relatively uniform, this is the closest thing chemical recycling has to a solved problem today.
What's still scaling up
Pyrolysis of mixed polyolefins (PE and PP) into pyrolysis oil is commercially operating but at much smaller volumes relative to the scale of polyolefin waste generated. Yield and oil quality remain sensitive to feedstock contamination, and downstream refining to usable monomer or fuel-grade product typically still uses fossil-derived processing infrastructure, which complicates simple "circular" framing.
What's mostly still lab- or pilot-scale
Enzymatic depolymerization and some solvent-based dissolution recycling methods show promising lab results for select polymers but haven't yet demonstrated the throughput or cost profile needed for broad commercial deployment.
What this means for material sourcing
If you're evaluating recycled-content material and the supplier's story involves chemical recycling, the honest questions to ask are: which specific process, at what scale, and with what feedstock consistency? "Chemically recycled" is not a single, uniform claim — the maturity gap between PET depolymerization and, say, mixed-polyolefin pyrolysis is significant, and it should factor directly into cost, supply reliability, and material performance expectations.
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