Food-contact rPET should be qualified as a source–process–batch–application system, not by a “food grade” statement or a passing COA alone. Before supplier approval, buyers should verify four links: where the recycled PET came from, whether the recycling/decontamination process addresses the contamination risk of that input, whether the analytical and compliance evidence applies to the intended food-contact use, and whether the commercial batch can be traced back to the qualified process. FDA identifies residual contaminants, inappropriate PCR input, and non-compliant additives as key concerns for recycled food-contact plastics.

The approval question is therefore not simply:

“Does this rPET meet specification?”

It is:

“Can this commercial rPET lot be connected to a controlled feedstock, an appropriate decontamination process, relevant test evidence, and the intended food-contact application?”

Start With the Intended Use, Not the Supplier Certificate

Before comparing suppliers, define the use conditions that the rPET must support:

• direct food contact or use behind another layer;
• target market;
• food types;
• contact temperature and duration;
• single-use or repeated-use application;
• percentage of rPET in the final structure;
• bottle, sheet, tray, container, or another conversion route.

FDA specifically considers the intended food type, temperature, contact duration, and repeated- or single-use conditions when evaluating recycled plastics for food contact.

This matters because a supplier may have technically valid food-contact evidence that covers a narrower use than the buyer intends.

A favorable regulatory document, declaration, challenge study, or migration report should therefore be checked against the actual application rather than treated as a universal approval.

The first practical qualification rule is:

Do not approve the rPET grade until the scope of the supplier's evidence and the scope of your intended use match.

Which Contamination Risks Should Buyers Separate?

“Contamination” is too broad to be useful as a purchasing specification.

For supplier qualification, it is more useful to separate contamination risk by where it enters the material history.

FDA notes that chemical contaminants may remain in recycled plastic and migrate into food, while EU rules recognize that post-consumer plastic can contain incidental contamination whose identity and level may vary according to source and collection conditions.

1. Feedstock and Wrong-Stream Contamination

The first question is whether material entered the recycling stream that was not represented in the qualification assumptions.

Potential concerns include:

• non-target polymers or articles;
• material from inappropriate previous uses;
• unintended substances introduced during collection;
• foreign components associated with collected packaging.

Under current EU recycled-plastic rules, collection and pre-processing controls address the origin of the plastic waste as well as unwanted plastics, caps, labels, adhesives, other materials, substances, and remaining food before decontamination. The rules also require quality-assurance controls and traceability through the collection/pre-processing chain.

For a buyer, this means that an analytical result on the final pellet cannot fully replace understanding what the decontamination process is expected to handle.

Ask:

• What feedstock streams are accepted?
• What streams are excluded?
• How are incoming materials inspected or classified?
• What input specification must be met before decontamination?
• Can a significant change in collection source occur without customer notification?

If the supplier cannot explain the input boundary, it becomes difficult to judge whether the decontamination evidence still represents future commercial lots.

2. Contamination That the Decontamination Process Must Remove

The second question is whether the recycling process has evidence appropriate to the possible incidental contamination in its input.

FDA recommends evaluating the source of PCR plastic, source controls, recycling-process details, and testing demonstrating removal of possible incidental contaminants. Depending on the recycling route, this can include surrogate contaminant studies and, where appropriate, migration testing or modeling. FDA treats tertiary PET/PEN recycling differently and states that it no longer evaluates those processes or issues individual opinion letters for them.

This creates an important supplier-qualification boundary:

Do not make “Does the supplier have an FDA letter?” the universal approval question.

Instead ask:

What regulatory or technical evidence is appropriate for this specific recycling route, and does that evidence apply to the process supplying my material?

For EU supply, the same principle applies through a different regulatory framework: the relevant recycling technology, process where applicable, decontamination installation, operating requirements, and restrictions must remain connected to the material placed on the market.

3. Contamination or Change Introduced After Decontamination

Qualification should not stop when the decontamination step ends.

Post-processing, blending, additives, conversion, storage, packaging, or handling can create a new evidence gap if they differ from the route represented during qualification.

The useful question is:

After the validated or assessed decontamination step, what happens to the material before it becomes the commercial lot we receive?

Verify whether:

• another material is blended into the rPET;
• additives are introduced;
• post-processing occurs on another line or site;
• the commercial product can be exposed to other material streams;
• packaging protects the material from new contamination;
• the commercial-lot identity remains connected to the decontamination batch.

EU rules explicitly require the decontamination installation and recycling facility to be operated in a way that prevents new contamination and require individual batches to retain quality records and identification.

This is why supplier qualification should follow the whole commercial route, rather than reviewing the recycling technology in isolation.

Use the Contamination Evidence to Make a Decision

The buyer does not need every supplier to provide the same document.

The buyer needs the evidence package to answer the same qualification questions.

The important point is that testing and process evidence answer different questions.

Testing can describe the sample tested.

Process qualification explains why the result is expected to remain relevant when commercial production continues.

Strong supplier approval normally requires both.

Why Two “Passing” Contaminant Reports May Not Be Comparable

A common purchasing mistake is comparing only the reported numbers.

Suppose Supplier A reports a contaminant as “not detected,” while Supplier B reports a measurable value.

That does not automatically mean Supplier A has cleaner rPET.

Before comparing the results, check:

Analytical Scope

Did both laboratories look for the same substances or the same analytical range?

A targeted test answers whether specified analytes were found under that method.

A broader screening approach answers a different question.

“ND” should therefore never be interpreted as “no contaminants exist” without knowing what was actually measured.

Sample Identity

Was the material:

• washed flake;
• material entering decontamination;
• decontaminated output;
• finished rPET pellet;
• converted packaging?

Results from different stages of the recycling chain do not describe the same risk point.

Batch Identity

Can the laboratory report be connected to:

• the qualification sample;
• a pilot lot;
• a commercial production lot;
• the batch being offered in the quotation?

An undated or unidentified “typical test report” may be useful for preliminary screening, but it provides weak evidence for commercial-lot approval.

Reporting Capability

Check the reporting or detection limits used by each method.

Two suppliers can both report “ND” while the methods have different capabilities.

Likewise, a numerical difference may not be meaningful if sample preparation and reporting bases are different.

Test Conditions

Migration-related results only become useful when the test conditions are relevant to the intended food-contact application.

This is why analytical comparison should follow:

same qualification question → comparable sample stage → comparable analytical scope → relevant use conditions

rather than simply:

lowest reported number wins.

Detailed NIAS, odor, and migration-data interpretation is a separate analytical task. For supplier qualification, the important step is first determining whether the submitted analytical evidence actually belongs to the material, process, and application being approved.

Can the COA Qualify the rPET?

No. A COA is necessary for many commercial qualification programs, but it answers only part of the decision.

A batch COA may demonstrate conformity with agreed release parameters such as:

• intrinsic viscosity or another agreed polymer-quality parameter;
• moisture;
• color;
• physical contamination limits;
• other commercial specification items.

These parameters can help establish whether the commercial material remains inside the agreed processing-quality window.

They do not, by themselves, establish:

• feedstock history;
• source-control effectiveness;
• decontamination-process identity;
• regulatory scope;
• contaminant-removal capability;
• intended-use restrictions;
• whether a test report applies to the commercial lot;
• whether the supplier changed the qualified process.

A useful documentation rule is:

COA = batch release evidence.

Qualification file = supplier/process/application evidence.

For EU recycled plastics placed on the market, current Regulation (EU) 2022/1616 requires individual batches to have a quality record and unique identification, while recycled plastic placed on the market must be accompanied by a declaration of compliance. The regulation also connects documentation to the decontamination installation, batch and applicable use restrictions.

A generic COA should not be used as a substitute for that wider evidence chain.

Trace the Commercial Lot Back to the Qualified Process

For recycled PET, the most useful traceability question is not:

“Does the supplier have a batch number?”

It is:

“How far can that batch number take us?”

For qualification purposes, the preferred chain is:

Delivered lot

→ commercial production batch

→ decontaminated output

→ decontamination installation

→ recycling process

→ controlled input

Current EU rules provide a useful example of this principle. Individual batches require quality records and unique identification; the regulatory system also identifies decontamination installations and, where applicable, recycling processes. (eur-lex.europa.eu)

This distinction matters when buying through a distributor.

A distributor's internal lot number can provide commercial traceability without necessarily providing technical traceability to the recycling process.

If the material changes hands before reaching the buyer, verify that supplier documentation still allows the purchased lot to be connected to:

• the original rPET grade;
• producing site;
• relevant recycling/decontamination route;
• applicable compliance declaration;
• upstream batch identity.

If that connection cannot be established, the buyer has a traceability gap even if the shipment itself is fully traceable inside the distributor's ERP system.

Do Not Transfer Sample Approval Directly to Commercial Supply

A qualification sample can pass every requested test and still fail to represent future purchases.

Before transferring sample approval, record:

• exact grade;
• manufacturing/recycling site;
• recycling route;
• batch number;
• test methods;
• compliance-document version;
• packaging format;
• intended application.

Then confirm what the next material actually represents.

A practical qualification sequence is:

Qualification Sample

→ Pilot or Representative Production Lot

→ First Commercial Lot

→ Routine Batch Release

→ Change Control

A pilot lot is particularly useful when the initial sample came from a trial, laboratory-scale campaign, special sorting campaign, or production condition that may not represent routine supply.

For the first commercial lot, verify four things again:

1. Process equivalence — Was it manufactured through the same qualified route?
2. Specification equivalence — Does it meet the same agreed release requirements?
3. Evidence equivalence — Do the compliance and analytical documents still apply?
4. Packaging equivalence — Is the commercial material protected and handled in the same way assumed during qualification?

Specification compliance alone does not prove all four.

That distinction becomes even more important when approving a second supplier. Two rPET grades can have similar IV, moisture, color, and processing behavior while relying on different feedstock controls, decontamination technologies, analytical evidence, and regulatory scopes.

A second source should therefore be qualified against the same application requirements, not against the first supplier's COA alone.

Which Supplier Documents Should Be Approved Before Commercial Purchase?

The goal is not to collect the largest possible document package.

Each document should answer a qualification question.

Product Specification / TDS

Use it to define the purchased material and agreed processing-quality window.

Verify that the specification belongs to the exact commercial grade.

Batch COA

Use it for lot release against agreed specification limits.

Do not use it as proof of the complete recycling history.

Food-Contact Declaration or Applicable Regulatory Evidence

Use it to determine the compliance basis and scope of intended use.

Verify:

• material identity;
• process or site identity where relevant;
• conditions and restrictions of use;
• whether the document is current;
• whether it applies to the supplied grade.

For EU material, Regulation (EU) 2022/1616 currently requires a declaration of compliance for recycled plastic placed on the market, with its templates covering product and batch identification, the basis for operation/authorisation, recycled content and use restrictions.

Feedstock and Process Information

Use this to establish whether the commercial supply follows the input and recycling route represented by the qualification evidence.

The buyer does not necessarily need confidential operating know-how. The supplier does need to provide enough information to establish continuity between the qualified process and supplied material.

Analytical / Decontamination Evidence

Use this to address the contamination question that cannot be resolved by specification alone.

Before accepting the data, establish:

• what was tested;
• which batch was tested;
• where in the process it was sampled;
• what analytical scope was used;
• whether the test conditions are relevant to the intended use.

Change-Control Procedure

Use this to determine whether today's approval will still mean the same thing next year.

This document becomes especially important for recycled materials because feedstock and processing variables can change upstream of the final COA.

Which Changes Should Trigger Qualification Review?

Not every manufacturing adjustment requires full requalification.

But changes should trigger review when they could break one of the links used for the original approval.

Examples include changes to:

• feedstock source or collection route;
• accepted input specification;
• sorting or pre-processing route;
• recycling/decontamination installation;
• relevant process configuration;
• manufacturing site;
• post-processing or blending route;
• additives;
• analytical method used for an agreed release decision;
• commercial specification;
• packaging or handling where contamination control could be affected;
• intended-use or regulatory scope.

The buyer's change-control question should be:

Would this change make any evidence used in our original approval no longer representative?

If yes, decide whether the response should be:

document review → targeted retesting → new sample → commercial-lot verification → full requalification

rather than automatically repeating the entire program.

This keeps change control proportional to the actual risk.

When Should the Supplier Be Approved, Held, or Requalified?

A supplier should move toward commercial approval when the evidence forms one continuous chain:

defined application

→ controlled feedstock

→ appropriate recycling/decontamination route

→ relevant contaminant evidence

→ identifiable grade

→ representative sample

→ traceable commercial lot

→ agreed batch specification

→ change control

Proceed Toward Approval

Proceed when the intended use, process evidence, supplier documentation, sample identity, and commercial material are aligned.

Hold Approval and Request More Evidence

Hold when, for example:

• the food-contact statement has no clear application scope;
• the analytical report cannot be linked to a batch;
• the regulatory evidence refers to a different process or site;
• the qualification sample cannot be connected to routine production;
• the supplier provides recycled-content certification but not food-contact qualification evidence;
• traceability ends before the relevant recycling process.

These gaps do not automatically mean the rPET is unsuitable.

They mean the buyer does not yet have enough evidence to make the approval decision.

Trigger Qualification Review

Review the approval when a supplier change alters:

• the material source;
• recycling route;
• manufacturing identity;
• compliance scope;
• analytical basis;
• commercial specification.

The qualification system should distinguish material failure from evidence discontinuity.

Both can stop approval, but they require different corrective actions.

What Should Be Defined in the RFQ?

Once the qualification logic is clear, the RFQ becomes much more useful.

Instead of requesting only:

“Food-grade rPET, please quote.”

define the information required to determine whether the supplier can actually enter your approval process.

Include, where relevant:

• rPET grade and form;
• target application;
• destination market;
• intended food-contact conditions;
• required recycled-content level;
• processing specification;
• required COA parameters;
• required food-contact documentation;
• process/site identification needed for qualification;
• relevant contaminant or analytical evidence;
• sample quantity;
• requirement for a representative production or pilot lot;
• packaging requirements;
• annual or trial volume;
• required change-notification conditions.

This creates a much better supplier comparison because price is being compared between materials that have first passed the same qualification questions.

For an alternative supplier, the most useful request is not:

“Can you match our current rPET specification?”

It is:

“Can you meet the same application, specification, contamination-control, documentation, batch-traceability, and change-control requirements?”

That is the point where a search for food-contact rPET qualification naturally becomes a specification review, sample evaluation, second-source qualification, or RFQ.

For ChemicalCell sourcing discussions, the relevant next step is therefore to compare the commercial specification and qualification evidence together—including grade identity, required COA items, food-contact use, sample or pilot-lot requirements, traceability expectations, and change-control conditions—before evaluating an alternative supplier or requesting a commercial quotation.