PCR resin is post-consumer recycled resin: plastic made from material that reached an end user, was discarded, and was then collected, sorted, washed and reprocessed into usable resin. The “post-consumer” part is not a description of quality. It is a statement about where the material came from, and that origin is exactly what regulation and brand contracts are written around.
That is why PCR behaves unlike every other product a recycling plant sells. Flake and regrind are priced on what they are — polymer, colour, moisture, contamination. PCR is priced on what you can prove about where it came from, and then rejected on what you failed to remove. Two identical loads of pellets, chemically indistinguishable, are worth different amounts if only one arrives with a documented chain of custody. This page covers who is asking for that proof, the contamination limits your output has to clear before the proof is worth anything, and what both of those require a line to do differently.
What PCR Resin Means, and What It Is Not
Three terms get used loosely and the difference between them is the whole basis of the market.
Post-consumer recycled (PCR) material has been through the hands of an end user. Bottles from kerbside collection, drums returned from a site, film recovered from retail back-of-store. It is the harder material to process and the more valuable one to sell, because it is the only category that counts towards recycled-content obligations.
Post-industrial recycled (PIR), sometimes called pre-consumer, is factory scrap: runners, trim, rejects, purgings. It is cleaner, more predictable and cheaper to process. It is also, under most recycled-content rules, worth nothing towards the target — the reasoning being that factory scrap was already being recovered internally, so diverting it into a product diverts nothing from waste. A plant that quotes a high recycled-content figure achieved with PIR is answering a different question from the one its customer’s compliance team is asking.
Regrind describes a physical form rather than an origin: material ground into flake and not melt-filtered. Regrind can be post-consumer or post-industrial, and the two questions are independent. The differences that matter commercially are set out in plastic regrind and how buyers judge its value.
One further distinction decides which of your customers can use your material at all. PCR bound for general applications needs documentation of origin. PCR bound for food contact needs the recycling process to have been assessed by a regulator. In the United States that is a favourable opinion from the FDA under its recycled plastics in food packaging programme; in Europe it is an evaluation by EFSA under the food contact materials framework. No amount of washing substitutes for that assessment.
Who Is Asking You to Prove It, and What They Ask For
Demand for PCR was not created by a single law. It arrived in three overlapping waves, and the wave a given buyer is responding to changes what they will ask you for.
Brand commitments came first and are voluntary. Large consumer goods and beverage companies published recycled-content targets in their own reporting ahead of any requirement to do so. These are enforced through purchasing rather than penalties, which makes them contractual, negotiable and pilotable — for a plant building its first documented supply chain, a brand customer is usually the realistic first step rather than a regulated market.
US state law came second. Individual states have legislated minimum recycled content for defined packaging categories, California and Washington among them. There is no federal recycled-content mandate, so the obligation follows your customer’s sales map rather than a border. This is the most administratively awkward of the three, because a converter selling into several states may carry several different reporting duties for the same product.
The European Union moved third and moved widest, shifting packaging rules from a directive transposed differently by each member state towards a regulation applying across the single market. The practical effect is that recycled content becomes a condition of market access rather than a national variation. The Commission maintains the current position on its packaging and packaging waste pages.
A caution that matters more than any figure this article could give you: the specific percentages, the categories they apply to and the compliance dates in all three waves have been amended, phased and re-scoped repeatedly, and they continue to be. Any supplier — including this one — quoting you a percentage and a date on a web page is quoting a snapshot. Before you commit to a customer, read the current text of the instrument that applies to their market, or have their compliance function tell you in writing what they need.
What is durable is the shape of the obligation, and on that axis the three converge:
| Brand commitments | US states | European Union | |
|---|---|---|---|
| Type of instrument | Voluntary corporate targets | State statutes; no federal mandate | Bloc-wide regulation |
| Who is bound | Suppliers inside that brand’s chain | Producers selling into each state | Producers placing packaging on the EU market |
| How it bites | Contractually, through supplier audits | State penalties and reporting duties | Market access — non-compliant packaging cannot be placed |
| What lands on you | Audit access and a certificate they can show | The same, plus state-specific reporting formats | Documented origin and traceable chain of custody |
| Cost of failing | Loss of the contract | Penalties in that state | Loss of a market |
Every column ends in the same place: someone needs to show a third party where the input came from. A plant that produces excellent pellets from undocumented mixed feedstock is well positioned for the commodity market and poorly positioned for this one.
The Contamination Limits That Decide Whether Your Output Qualifies
Documentation gets you considered. Contamination is what gets you rejected, and this is the part that is a machine problem rather than a paperwork one.
For PET destined for food contact, two thresholds do most of the work. Total foreign matter has to sit under roughly 200 ppm, and PVC specifically under about 100 ppm. Those are small numbers in a physical sense — 100 ppm is a hundred grams in a tonne — and the second one is much harder to hit than the first, for a reason that is worth understanding before you buy equipment.
Sink-float separation cannot remove PVC from PET. The tank works on density and nothing else, and it works extremely well for the common contaminants: polypropylene caps at 0.90–0.91 g/cm³ and polyethylene label film at 0.92–0.96 float, while PET at 1.38–1.40 sinks. But PVC sits at 1.30–1.45. It overlaps PET. The one stage that removes almost everything else is blind to the one contaminant that does the most damage.
That single fact determines the front end of a PCR-grade line. PVC has to come out before the crusher, while it is still a whole bottle that a person or an optical sorter can identify, because after crushing it is flake of the same size and the same density as the product and it is unremovable. A sorting belt with a genuine pick station and a metal detector is not a refinement on a PCR line; it is the stage the specification depends on.
Why PVC matters so much out of proportion to its quantity: it releases hydrogen chloride when heated to PET processing temperatures, which degrades the melt and discolours the batch. A contaminant present at a hundredth of a percent damages the whole extrusion run.
The other limits are conventional but non-negotiable. Residual moisture has to be controlled because water in PET causes hydrolysis during extrusion, permanently shortening the polymer chains: a centrifugal dryer at around 1,500 rpm brings flake to 0.5–2%, and a hot-air stage takes it below 1%. Labels and adhesive come off in two places — dry removal before crushing strips 80–90% of them while they are still whole objects, and hot washing at 85–95 °C with 1–3% alkali releases the hot-melt glue that dry removal leaves behind. Flake size for PET runs 12–20 mm, which is what the wash stages are designed around rather than a preference.
The APR Design Guide is the reference most North American buyers and converters work from when they argue about which of these limits applies to a given package.
What a PCR-Grade Line Has That a Regrind Line Does Not
Serving PCR demand is not a different process. It is the same process with four things added, and only one of them is paperwork.
A real sorting stage before size reduction. Covered above, and it is the difference that most affects the machine list. A regrind line can put material straight into a crusher because it already knows what the material is. A PCR line cannot.
Physical segregation of post-consumer from post-industrial feedstock, from the moment it arrives. Two yards and two shredder feeds, not one of each. Mixing them does not produce an average — it destroys the claim on both, because you can no longer evidence that any given output was post-consumer.
Drying to a stated specification rather than to “dry enough”. A buyer with a compliance position asks for a number, which means a centrifugal dryer whose output you actually measure. The equipment is the same as any plastic recycling washing line carries; what changes is that the figure gets recorded per batch instead of assumed.
A pelletizing stage, for a reason that is administrative as much as technical. A controlled melt through a pelletizing line gives a batch with defined boundaries: this quantity, from this input, through a 40–120 mesh melt filter, on this date. Flake sold loose from a yard is much harder to bound, and an unbounded batch is difficult to put through a mass balance. For rigid streams that means an SJ pelletizing line for rigid plastics; for bottle streams the front end is a bottle-to-flake washing line before extrusion. The stages themselves are described in the plastic recycling process from bale to pellet.
Batch Traceability — The Paperwork Side Nobody Quotes For
This is the part most plants have to build from nothing, it appears on no equipment quotation, and it is the part an auditor actually examines.
The record has to start at the gate, not at the extruder. If you cannot evidence that a bale was post-consumer material, nothing downstream recovers that claim — no machine adds provenance. In practice that means supplier agreements identifying the source, delivery records tied to individual bales or loads, and an input log that a stranger could follow.
From there each batch needs five fields closed out: input source, input quantity, processing date, output quantity, and destination. Those five are what a mass balance is computed from, and a mass balance that does not close is the fastest way to fail an audit — not because anyone assumes fraud, but because it means the records are not describing what the plant actually did.
Two habits make the difference between records that survive an audit and records that do not. Retain a physical sample against every batch, so that a disputed shipment can be tested rather than argued about. And write the yield loss down honestly. A plant whose records show 100% conversion has records nobody believes; a plant that documents its reject rate looks like a plant that is measuring itself.
The commercial reason to do any of this is that it changes who you can sell to. A compliance requirement is a far less price-elastic reason to buy than a cost saving, and that is a different customer base from the commodity spot market — worth mapping before investing. Where to sell recycled plastic granules covers the buyer types and what each one tests, and how to start a plastic recycling business covers proving the route to market before the equipment is ordered.
How Recycled Content Is Verified
Nobody can measure post-consumer content in a finished pellet. There is no laboratory test that distinguishes a polymer chain that was once a bottle from one that was never used. Verification is therefore entirely a matter of accounting and audit, which is why the documentation burden falls where it does.
It rests on three things. Chain of custody follows the material through every party that handled it, from the collector to the converter, with each link evidenced. Mass balance reconciles what came in against what went out over a defined period, so that more recycled content cannot be claimed than was received. Third-party audit puts an independent certifier through the records and the site, and issues the certificate the customer actually wants to see.
The food-contact route works the same way, and the FDA’s own programme makes the logic unusually explicit. What FDA reviews is the recycling process — a description of the process, the source of the PCR plastic, the source controls in place, and test results showing the process removes incidental contaminants. What it issues is a no-objection letter attached to that process. Its public database of favourable opinions currently lists several hundred such submissions, and the agency states that a sublicensee running the same process under the same conditions does not need a new letter of their own. The approval travels with the process, not with the company and not with the shipment.
Two consequences follow for a plant. The work is front-loaded and then maintained, rather than repeated per order. And an unverified claim is worse than no claim: a customer who has built their own compliance position on your statement and then cannot evidence it has a problem that will become your problem. If the documentation is not in place, sell the material as good recycled resin and say nothing about post-consumer content.
Frequently Asked Questions
Is PCR the same as recycled plastic?
No. PCR is one category of recycled plastic — material that reached an end user before being collected and reprocessed. Recycled plastic also includes post-industrial scrap, which never left the factory. The distinction matters commercially because recycled-content regulations and brand targets generally count only the post-consumer portion, so a high recycled-content figure achieved with factory scrap does not answer a compliance requirement.
What contamination limits does food-grade PCR have to meet?
For PET the working thresholds are total foreign matter under roughly 200 ppm and PVC under about 100 ppm. PVC is the difficult one because its density of 1.30–1.45 g/cm³ overlaps PET at 1.38–1.40, so a sink-float tank cannot separate them. It has to be removed at the sorting belt while it is still a whole bottle. Moisture is the other hard limit, controlled to 0.5–2% by a centrifugal dryer at around 1,500 rpm and below 1% by a hot-air stage.
Why can a sink-float tank not remove PVC from PET?
Because it separates on density alone and the two densities overlap. Polypropylene caps at 0.90–0.91 and polyethylene label film at 0.92–0.96 float away cleanly, and PET at 1.38–1.40 sinks. PVC at 1.30–1.45 sinks with the PET. Once both have been through the crusher they are flake of the same size and the same density, and no downstream stage will part them — which is why PVC removal has to happen before size reduction, not after.
What does a PCR line have that an ordinary recycling line does not?
Four things. A genuine sorting stage before the crusher, because the contamination that matters cannot be separated later. Physically segregated post-consumer and post-industrial feedstock, from the gate onwards, since mixing them destroys the claim on both. Drying to a measured specification rather than to “dry enough”. And usually a pelletizing stage, because a controlled melt gives a batch with boundaries that a mass balance can be computed from.
How is recycled content in a product actually verified?
Through documentation rather than testing, because no laboratory method can distinguish post-consumer polymer from virgin in a finished part. Verification rests on chain-of-custody records tracing the material through each handler, a mass balance reconciling input against output over a period, and an independent audit that issues a certificate. The certificate attaches to the plant and its process, not to an individual shipment.
Can PCR resin be used for food packaging?
Only where the recycling process has been assessed for it. Food-contact clearance is granted to a process following review by a regulator — a no-objection letter from the FDA in the United States, an evaluation by EFSA in Europe — rather than to a material or a machine. A washing line can produce material clean enough to be a candidate, but no equipment supplier can sell you food-grade status, and any claim that a machine is food grade out of the box describes something that does not exist.
Does a recycling plant need certification before it can sell PCR?
Not to sell recycled resin, but effectively yes to sell it as PCR to a customer with a compliance requirement. Those buyers need evidence they can pass to a regulator or an auditor, and an uncertified supplier cannot provide it. The practical sequence is to establish input segregation and batch records first, prove them on brand or contract customers, and pursue formal certification once the documentation is genuinely running rather than aspirational.
If you are configuring a line with documented post-consumer feedstock in mind, the sorting stage and the input segregation matter as much as the machine list — tell us the feedstock source and the customer requirement you are aiming at, and the equipment questions follow from those rather than the other way round. The full range is on the plastic recycling machine line overview. The grading logic for the largest PCR stream is covered in PET bottle recycling by flake quality grade, the washing decision behind the adhesive limits is in hot wash versus cold wash, and a rigid-stream configuration is described on the washing line for rigid plastics.
