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Some waste plastics can be chemically broken into smaller molecules that serve as building blocks for new materials. That “unzipping” is called depolymerization, and it works for certain polymers—not plastics universally. Other processes, including pyrolysis and gasification, use heat to make different mixtures such as oils, gases, chemicals, or fuels. The useful question is not just whether plastic was processed, but what went in, what came out, and where that output goes.
What does it mean to “unzip” a plastic?
Plastics are made of long molecules called polymers, built from smaller chemical units. Depolymerization uses chemical treatment to break bonds in a polymer and produce smaller molecules, often monomers—the building blocks used to make that polymer. Those monomers can potentially be used to make plastic again. The route is relevant to some polymers, including polyethylene terephthalate (PET), polyamides and polylactic acid (PLA), but it is not a universal way to return all plastics to their original ingredients.
For example, methanolysis heats plastic with methanol and a catalyst under pressure to break polymer chains into monomers. PET depolymerization is one documented route to useful monomers, as described in a review by Rahimi and García in Nature Reviews Chemistry. The precise chemistry and workable feedstock depend on the polymer and process.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteHow does depolymerization differ from other recycling routes?
Mechanical recycling remains the predominant recycling method: plastic is sorted, cleaned, shredded and melted without changing its chemical building blocks. The resulting material can have different properties depending on the variability of the waste feedstock. The U.S. Environmental Protection Agency (EPA) groups advanced recycling technologies into conversion, depolymerization and purification.
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| Route | What happens | Typical output and important distinction |
|---|---|---|
| Mechanical recycling | Plastic is sorted, cleaned, shredded and melted; its chemical building blocks are not intentionally changed. | Recycled plastic material. Input variability can affect its properties. EPA |
| Depolymerization | Chemical treatment breaks polymer bonds. Examples include processes for PET, polyamides and PLA. | Monomers or other smaller molecules that may be used as building blocks for new plastic. Suitability depends on the polymer. EPA; Rahimi and García |
| Purification | A polymer is dissolved without breaking the bonds between its monomers, then additives or contaminants are separated out. | The intended output is recovered polymer with the same chemical properties and quality as virgin polymer; that is a process aim, not a guarantee for every feedstock or facility. EPA |
| Pyrolysis | Plastic is heated in the absence of oxygen. | Pyrolysis oil, hydrocarbon gases and char. Depending on use, outputs may be fuels or chemical feedstocks; this is not the same as recovering the original polymer. EPA; U.S. Government Accountability Office |
| Gasification | Plastic is thermally processed into a gas mixture. | Syngas, mainly hydrogen and carbon monoxide, which may be used as fuel or chemical feedstock. U.S. Government Accountability Office |
Pyrolysis and gasification are thermal conversion routes, not ways of simply unzipping a polymer into its original monomers. Their outputs differ from one another and from purified polymer or monomers. The word “recycling” alone does not tell you whether a process makes new plastic material, other chemicals or fuel. OECD notes that thermolysis processes focused on fuel, and their energy requirements, make the recycling label controversial for many such processes; see its 2022 Global Plastics Outlook.
Which plastics and waste streams can a process handle?
The polymer’s chemistry sets the starting point: depolymerization is suited to some polymers such as PET, polyamides and PLA, while conversion technologies often target polyolefins such as polyethylene and polypropylene. That does not mean a process can accept every item made from a named polymer. Sorting, contamination, additives, pretreatment and the consistency of the incoming supply can all affect whether a waste stream is usable.
EPA notes that facilities need access to used plastic feedstock of consistent quality and quantity, and that expanded collection and sorting can improve that access. In its Advanced Recycling of Plastics page, last updated May 22, 2026, the agency says expanded recycling infrastructure for collection and sorting could increase access to feedstock for recyclers making new products.
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- Polymer identity: Is the stream a polymer the process is designed to handle?
- Input quality: How much contamination, mixing or additive content can the process accept?
- Preparation: What sorting, cleaning or other pretreatment is needed?
- Output: Is the product purified polymer, monomers, chemical feedstock or fuel—and does it meet a specification for its intended use?
- Destination: Is there a documented use for the output, and does that use actually displace virgin material or fossil fuel?
Does chemical processing always mean plastic is recycled into plastic?
No. Depolymerization may make monomers that can serve as plastic-building blocks, and purification aims to recover polymer. But pyrolysis oil, gas and syngas can instead be used as fuels or as feedstocks for chemicals. A process description should identify its actual output and destination rather than treating “advanced recycling” as proof that the plastic became new plastic.
Energy use is one reason to examine the full route. OECD gives a theoretical illustration for pyrolysis of polyethylene waste: an internal energy demand of 1,328 megajoules per kilogram of waste for fuel with a calorific value around 40 megajoules per kilogram of waste. This is a theoretical example in the OECD’s 2022 analysis, not a measurement that describes every operating plant. It should not be used as a general performance figure for other polymers or processes.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What do current recycling figures show?
National statistics help describe the scale of the waste problem, but the figures below are specific to Australia and the 2024–25 reporting year—not global recycling rates.
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| Measure | Reported figure | Scope and source |
|---|---|---|
| Plastic waste | 3.0 million tonnes; 13% recycled, 1.9% used for energy value and about 86% landfilled | Australia’s national waste figures for 2024–25. The report also gives 111 kg per capita and estimates packaging accounted for 42% of plastic waste. Australian Department of Climate Change, Energy, the Environment and Water, National waste and resource recovery report 2026 |
| Plastic product and packaging recovery | 512 kilotonnes: 442 kilotonnes recycled and 69 kilotonnes used for energy recovery | The separate Australian plastics flows report for 2024–25; its recovery rates include pre-consumer and post-consumer material. Selected polymer recovery rates are PET 38%, HDPE 21%, PA 18% and LDPE 18%. Australian plastics flows and fates report 2024–25 |
The national waste and plastics flows reports use distinct measures and scopes, so their totals should not be combined as though they were the same statistic. The polymer-specific recovery percentages are not evidence that any one chemical process caused those rates.
How should you judge a proposed process?
There is no single best route established across all plastics and conditions. A meaningful comparison needs to account for the feedstock, process and fate of the output—not just the technology’s name.
- Feedstock fit: Which polymers and contamination levels can it accept?
- Preparation: What sorting and pretreatment are required, and can the facility obtain enough consistent material?
- Product: Is the output polymer, monomer, another chemical feedstock or fuel? Does it meet the specification needed for its destination?
- Energy and environmental effects: What are the energy requirements and environmental impacts for this specific process and feedstock?
- Practical constraints: Is the route technically feasible for this waste stream, and does it comply with applicable regulations?
- Evidence: Are reported results specific to a dated facility, process and input, rather than generalized from a different technology?
The cited sources do not establish a directly comparable lifecycle or cost ranking across mechanical recycling, depolymerization, purification, pyrolysis and gasification. Nor should emissions, yields or performance at a particular facility be inferred from broad descriptions of these technologies. Those questions require process-specific evidence.
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