Recycled Content
A procurement team secures 50% recycled aluminium and reports the saving. The footprint does not move. The emission factor in the model is an industry average for aluminium, and an industry average already assumes a global mix of primary and secondary metal — it cannot tell that this particular purchase was different.
Recycled content is one of the largest embodied-carbon levers available in procurement, and one of the easiest to claim without ever reaching the number.
Recycled content is the proportion of a product made from recovered material rather than virgin feedstock, by mass. It lowers embodied carbon because secondary material skips extraction and primary processing — but only a factor specific to that material shows it.
Recycled content is a property of the material you bought. Whether it shows up in your inventory is a property of the factor you used — and those two facts are independent.
What recycled content means
Recycled content is the share of a product, by mass, that comes from material recovered from the waste stream instead of from virgin feedstock. It is expressed as a percentage and is normally verified by mass-balance records through the supply chain, not by testing the finished article — recovered and virgin aluminium are the same metal once melted.
| Property | Detail |
|---|---|
| Unit | Percentage of total product mass. |
| Two forms | Pre-consumer (manufacturing scrap) and post-consumer (recovered after use). |
| How it is evidenced | Mass balance and chain of custody records, not material testing. |
| Where it lands | Scope 3 Category 1, as a lower cradle-to-gate factor. |
| Governing convention | The allocation method — cut-off or system expansion — declared under ISO 14044. |
| Most common failure | Claiming the content against an industry-average factor, which cannot register it. |
Pre-consumer and post-consumer
The distinction matters more than it looks. Pre-consumer (or post-industrial) content is scrap generated inside manufacturing and fed back in — offcuts, trim, rejected batches. Post-consumer content is material recovered after a product has been used and discarded by an end user.
Only the second represents material genuinely diverted from disposal. Pre-consumer scrap was, in most processes, never going to be thrown away; recirculating it is ordinary good practice and in many industries is already baked into the industry-average factor. A claim that does not separate the two is usually inflating the first to describe the second, and most procurement standards and ecolabels weight or cap pre-consumer content for exactly this reason.
Why it moves embodied carbon
Secondary material skips the highest-energy steps in a material’s life: extraction, beneficiation and primary conversion. For metals that means skipping ore reduction, which is where the majority of the energy sits. For plastics it means skipping polymerisation from fossil feedstock. What remains is collection, sorting, cleaning and reprocessing — real energy, but a fraction of the original.
The saving is therefore largest where primary production is most energy-intensive, which makes aluminium the extreme case and glass a much more modest one.
How much it saves, by material
Indicative cradle-to-gate reduction for 100% recycled input against primary production. Figures are illustrative order-of-magnitude values used to show the ranking; use a supplier-specific or grade-specific factor for any reported number.
The ordering is stable even where the exact percentages are not: recycled content is a transformative lever for aluminium, a strong one for steel and plastics, and a marginal one for glass, where the furnace energy dominates and cullet displaces relatively little of it.
The factor trap
This is the part that defeats most claims. An industry-average emission factor for a material already embeds the average recycled share of that market. If the global aluminium average assumes a particular primary/secondary mix, then multiplying your tonnage by that factor returns the same answer whether you bought 0% or 90% recycled metal. The specification changed; the arithmetic did not.
Before claiming a recycled-content saving, ask one question: would this number be different if we had bought the virgin grade? If the factor is an industry average, the answer is no, and there is no saving to report — only a saving to go and evidence with primary data.
Reaching the number requires a factor that is specific to what you actually bought: a supplier’s own product carbon footprint, an EPD for that grade, or a recycled-grade row from a dataset that distinguishes routes. That is the supplier-specific method, and recycled content is one of the clearest cases where the step up from average data pays for itself.
Who gets the credit
Recycled content sits directly on the allocation question described under circular economy. Under a cut-off convention the buyer of recycled material inherits only collection and reprocessing, and whoever supplied the scrap gets nothing. Under system expansion the original producer is credited with the virgin production its recovered material displaced, and the second user’s benefit is correspondingly smaller.
Most EPD programmes and product category rules fix cut-off for exactly this reason: it is the convention under which a recycled-content claim is simplest to evidence and hardest to double count. The rule that survives whichever convention applies is that you may not claim the benefit at both ends of the same loop.
Worked example — a claim that does not land
A manufacturer buys 500 tonnes of aluminium a year and moves from a standard grade to one with 75% post-consumer content. Illustrative figures.
| Approach | Factor used | Reported result |
|---|---|---|
| Before | Industry-average aluminium, ~8.5 t CO2e/t | ~4,250 t CO2e |
| After, average factor | Same industry-average factor | ~4,250 t CO2e — unchanged |
| After, supplier EPD | Grade-specific, ~3.0 t CO2e/t | ~1,500 t CO2e |
The physical change is identical in rows two and three. The difference is entirely in whether the inventory was given a factor capable of seeing it. A procurement win that is not paired with a data win is invisible to the disclosure.
How the standards define it
ISO 14021 governs self-declared environmental claims and sets out how a recycled-content claim must be expressed and substantiated, including the separation of pre-consumer from post-consumer material. ISO 14044 does not fix a recycled-content method but requires the allocation procedure to be declared and applied consistently. The EU Packaging and Packaging Waste Regulation converts recycled content from a voluntary claim into a binding minimum for several packaging categories placed on the EU market, with the share rising on a legislated schedule.
Common confusions
Recyclable is not recycled. Recyclability describes what could happen to a product after use; recycled content describes what went into it. A package can be fully recyclable and contain no recovered material at all.
Pre-consumer content is not diverted waste. Manufacturing scrap recirculated in-house is ordinary process efficiency, and in many materials it is already inside the industry-average factor. Only post-consumer content represents material pulled back from disposal.
A higher percentage is not automatically lower carbon. If the recovered material must be shipped a long way, or reprocessed through an energy-intensive route, the saving narrows. For glass in particular the margin is thin enough that logistics can erase it.
Frequently Asked Questions
Almost certainly because you are multiplying tonnage by an industry-average factor. That factor already assumes the market’s average mix of primary and secondary material, so it returns the same number regardless of what you specified. To register the change you need a factor tied to the material you actually bought — a supplier product carbon footprint, an EPD for that grade, or a dataset row that separates the recycled route.
Pre-consumer content is scrap generated inside manufacturing — offcuts, trim, rejected batches — recirculated before anything reached a customer. Post-consumer content is material recovered after an end user finished with the product. Only the latter represents waste genuinely diverted from disposal, which is why claims standards require the two to be reported separately and why many procurement rules cap or discount the pre-consumer share.
Aluminium by a wide margin, because secondary production skips ore reduction, which is where almost all of the energy sits. Steel through the electric arc furnace route and the common plastics follow. Glass is the weakest case: furnace energy dominates its footprint and cullet displaces relatively little of it, so the saving is modest and can be cancelled by transport. The ranking holds even where published percentages differ.
No — that is a double count, and it is the reason allocation conventions exist. Under cut-off, the user of recycled material inherits only collection and reprocessing and the supplier of the scrap receives no credit. Under system expansion, the original producer is credited with the virgin production its material displaced. Pick one, declare it, and apply it to both ends of the loop rather than choosing whichever is favourable at each end.
Increasingly, yes. The EU Packaging and Packaging Waste Regulation sets binding minimum recycled-content shares for several categories of packaging placed on the EU market, rising on a legislated schedule, which turns what was a marketing claim into a compliance threshold with evidence requirements attached. Elsewhere it remains largely voluntary, driven by procurement rules and ecolabels rather than statute.
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