Open a technical discussion about recycled flexible packaging film and the abbreviation PCR arrives within the first sentence. PCR is also the single most misread term in the packaging film category. The same three letters name a laboratory technique that has nothing to do with packaging film, and the word “recycled” attached to them hides at least three different counting methods that produce three different numbers from the same roll of PCR packaging film.
This article separates those meanings. It explains what PCR stands for in a packaging context, how a post-consumer bottle becomes a film-grade resin, how recycled content is actually counted under ISO 14021, and what a GRS certificate does and does not prove for PCR PE film. It deliberately contains no performance figures — those belong in a specification sheet for a specific grade, not in a general explainer. Our own certification scope and certificate details are summarised on the PCR & GRS page.
Three things people mean by “PCR”
1. Post-consumer recycled content. That is the packaging meaning. PCR stands for post-consumer recycled, and it describes material recovered from a product after that product has completed its useful life with an end user. A bottle collected from a kerbside scheme is post-consumer material. Trim scrap swept off a converting line is not.
2. Polymerase chain reaction. That is the laboratory meaning — a DNA amplification technique used in molecular biology. That is why a search for “PCR film” returns sealing films for laboratory microplates rather than packaging film. Anyone sourcing packaging film online will meet this confusion directly, and it is worth recognising early: a supplier listing “PCR film” with a 96-well format is in a different industry.
3. A grade prefix with no fixed number. “PCR PE” or “PCR PET” names a material family, not a specification. The recycled fraction behind that label can range from a token percentage to an all-recycled input, and the label alone will not tell you which. The number has to be asked for.
The rest of this article uses PCR in sense 1.
From bottle flake to film-grade resin
The route from a collected bottle to a resin that runs on a blown film line has five stages. Each stage exists to remove something that would otherwise become a defect in the final PCR packaging film.
Collection and sorting. Material arrives mixed by polymer, colour and contamination. Sorting separates polyethylene from PET, and within polyethylene separates bottle-grade from film-grade input. Colour sorting matters more than buyers expect: natural and white streams can be re-coloured, mixed-colour streams generally cannot.
Washing. Hot washing with detergent and mechanical friction removes product residue, labels and adhesive. Adhesive is the stubborn one — residue that survives washing carbonises later in the extruder and emerges as black specks in the PCR film.
Grinding and density separation. Cleaned material is reduced to flake, and flotation separates polyethylene from denser polymers that survived sorting. The step is cheap and effective, and it is also where cross-polymer contamination is finally settled.
Melt filtration and pelletising. The flake is melted, degassed and filtered, then cut into pellets. Filtration rating is the single most consequential setting in this stage, because it determines the largest particle that can reach the film die.
Compounding. Stabilisers, slip and antiblock agents, and sometimes virgin resin are added to bring the melt index and processing behaviour into a usable window for blown film production.
One property runs across all five stages and is rarely written into a purchase specification: odour. Residual product, adhesive and cleaning chemistry all leave volatile traces that survive pelletising, and a PCR film that meets every mechanical target can still be rejected by a brand owner on smell alone. Odour is a function of the input stream far more than of the percentage, which is another reason the input stream belongs in the first question you ask your PCR film supplier.
The reason film grade is harder to make than bottle grade comes down to one sentence: a gel or a speck that is invisible inside a two-millimetre bottle wall becomes a visible defect in a thirty-micron film. The same contamination load that passes in a thick part fails in a thin one. That explains why a supplier’s recycled content percentage tells you almost nothing about whether the resin will run cleanly on your line.
How recycled content is counted
Recycled content has a formal definition, and it is worth reading once in the original rather than accepting a paraphrase.
ISO 14021:2016 defines recycled content as the proportion, by mass, of recycled material in a product or packaging, and it counts only two categories towards that proportion: pre-consumer material and post-consumer material (International Organization for Standardization, sec. 7.8.1.1). The same clause draws a line that catches people out — pre-consumer material excludes rework, regrind or scrap that is reclaimed within the same process that generated it. Routine edge trim fed straight back into the same extruder is not recycled content. That is process efficiency.
Three consequences follow, and each one explains a disagreement you may have already had with a PCR film supplier.
The denominator is negotiable in conversation, though not in a certificate. A figure quoted against “the film” and a figure quoted against “the pack” are different numbers. A laminate with a recycled film layer and a virgin sealing layer carries a lower pack-level percentage than its film-level percentage, and both statements can be true at once.
Pre-consumer and post-consumer are not interchangeable to a buyer. ISO 14021 counts both. Many brand commitments, and an increasing number of regulatory schemes, count only post-consumer material, or cap the pre-consumer share. A supplier can be fully accurate and still not meet the number your customer is measuring.
Mass matters, not layers. Because the definition is by mass, the film’s thickness and density enter the calculation, not its area. Two structures with identical recycled content by percentage can deliver very different absolute recycled tonnage.
The practical instruction is narrow: when someone quotes a recycled percentage, ask for the definition, the denominator and the input stream in the same reply. A number given without those three is not comparable to any other number. A specification sheet for a named grade is the one place where all three answers should appear together — the PCR PE film specifications are structured that way.
What GRS certification does — and does not — prove
The Global Recycled Standard is a voluntary international standard covering recycled content, chain of custody, social and environmental practice, and chemical restriction, verified by third-party certification bodies. Textile Exchange owns and maintains the standard.
Two thresholds matter commercially. Under GRS version 4.0, a product needs at least 20% certified recycled content to appear on a scope certificate at all, and at least 50% to qualify for product-specific GRS labelling; products between the two thresholds are certified but not eligible for the label (Textile Exchange, “Standard-Specific Details for Assurance Systems,” sec. 1.3.2). Chain of custody follows the Content Claim Standard, and under the standard a transaction certificate is issued for each business-to-business transaction, connecting the material back to its certified origin.
The third-party verification is real, and it is narrower than most buyers assume. A scope certificate confirms that a facility’s claimed material and its custody chain were audited. It does not certify the mechanical performance of the film; it does not mean the product is wholly recycled; and — stated plainly in the GRS Implementation Manual — the standard restricts hazardous chemicals in the processing of GRS products but “does not address the chemicals present in the Reclaimed Materials or what may be present in final GRS products” (Textile Exchange, GRS Implementation Manual 5.0, A3.2d). A GRS certificate therefore answers a sourcing question, not a food-contact or performance question. Those are answered by different documents.
Our own scope certificate, TE-00352946, is issued by Intertek. It covers PCR PE film produced from both pre-consumer and post-consumer input. Transaction certificates, which tie a delivered batch back to that certified origin, are available on request — ask for them at the quotation stage rather than at dispatch, so the paperwork travels with the goods and not after them.
Five questions to ask a PCR film supplier
1. Which definition of recycled content are you quoting? A supplier who answers “post-consumer only, per ISO 14021” is giving you a comparable number. A supplier who answers “recycled” is not.
2. Is that figure film-level or pack-level? Ask for the basis explicitly. If the answer is film-level, ask what the pack-level figure becomes once the rest of the structure is added.
3. Which input stream feeds the resin? Post-consumer bottle, post-consumer film and post-industrial reclaim carry different contamination profiles, different odour risk and different colour options. The percentage says nothing about the stream.
4. What is the gel and speck specification? That question predicts whether the resin will run on your line. Ask for a defect count per unit area at a stated film thickness, not for a percentage.
5. Which documents travel with the shipment? Scope certificate, transaction certificate and a certificate of analysis answer three different questions. Ask which ones arrive by default and which on request.
FAQ
Is PCR the same as recyclable? No, and the two are frequently conflated. Recycled content describes what the material is made from; recyclability describes what can happen to it after use. A film can contain post-consumer material and still fail a recycling stream if it is laminated to an incompatible layer.
Does a higher recycled percentage always mean a lower-quality film? Not by itself. Quality tracks the input stream, the filtration rating and the compounding discipline far more closely than it tracks the percentage. A well-controlled higher-percentage grade can outperform a poorly controlled lower-percentage grade on gel count. That is why the percentage should never be the only line on a comparison sheet.
Can recycled content reach 100%? Technically it can for some structures and applications; commercially the ceiling depends on the performance the application requires and on how the material is certified. The question worth asking is not “can you reach 100%” but “what does the highest workable percentage look like for this structure, and what changes when it goes up”.
Does PCR film print the same as virgin film? Surface energy and ink adhesion are properties of the film’s treatment, not of its recycled content. The variable PCR introduces is consistency: batch-to-batch variation in the resin can shift treatment uptake, so corona treatment levels are worth monitoring per batch rather than assuming a fixed setting carries over.
Where does GRS fit if my customer asks about it? GRS is one answer to the chain-of-custody question, and it is the one most often requested in export markets. If your customer’s requirement is a specific regulatory recycled-content obligation, check whether that obligation counts pre-consumer material — GRS does, and the customer’s scheme may not.
If you are sourcing GRS-certified PCR PE film for export and need the documentation pack including transaction certificates, send over your technical specifications for a quote. The same enquiry form covers our PCR PE bag range.
References
International Organization for Standardization. Environmental Labels and Declarations — Self-Declared Environmental Claims (Type II Environmental Labelling). ISO 14021:2016, ISO, 2016, sec. 7.8.1.1.
Textile Exchange. “Standard-Specific Details for Assurance Systems.” Textile Exchange, 2026, textileexchange.org/app/uploads/2026/04/TE-TXL-POL-204-V1.0-Standard-Specific-Details-for-Assurance-Systems.pdf.
Textile Exchange. Global Recycled Standard Implementation Manual 5.0. Textile Exchange, 2020, textileexchange.org/app/uploads/2020/08/GRS-201-V5.0-GRS-Implementation-Manual.pdf.