Hot melt adhesive recyclability in paper packaging depends on the finished construction and the recycling process. Assess the actual bonded package with a relevant test method; a chemistry name, low coat weight or solvent-free claim is not proof of recycling compatibility.
For packaging manufacturers, converters and procurement teams, the useful purchasing question is: does the evidence cover the adhesive grade, application pattern and complete package you intend to produce?
This guide explains how to review that evidence before approving a supplier or making a customer-facing recyclability claim.
The assessment concerns recovery of usable paper fibre. It does not mean the adhesive is separately recovered as a reusable product.
Planning a packaging project? Send KAISUN your complete paper packaging construction and intended recycling route to discuss adhesive selection and the evidence your project requires.
Define the Package and Intended Recycling Route
Start the inquiry with a packaging specification. Record the paper or board grade, coatings, printing, windows, labels, tapes and every adhesive joint. Include components expected to remain attached when the package enters recycling.
Ask the customer which market and collection stream the package will enter. Then identify whether the assessment concerns a conventional paper recycling process, flotation deinking or a specialised process. The 4evergreen design guideline distinguishes these pathways and also addresses sorting, which determines whether packaging reaches the intended stream.
For an initial supplier discussion, prepare a photograph, a construction drawing and a list of materials. Ask the laboratory how to prepare representative samples before cutting or removing components.
Application details also differ. A shopping bag may contain side seams, a folded bottom and handle reinforcement, as explained in our paper bag adhesive guide. An envelope can combine window-patch and closure systems; our envelope adhesive guide explains those separate bonding tasks.
Separate Repulping from Adhesive Removal
Repulping releases paper fibres into an aqueous suspension. Adhesive removal concerns what happens to the adhesive applications during subsequent separation. These are different questions.
FEICA explains that repulpability describes paper and board. An adhesive itself does not become pulp. When a supplier offers a repulpable adhesive, ask for the operational definition and the bonded-paper test behind that wording.
A hot melt does not have to dissolve in water for a paper package to be compatible with recycling. Screening out the adhesive application is an established route. Conversely, describing a material as water-soluble does not establish the performance of the finished package.
Review formulation and application together. The EPRC adhesive-removability assessment explains that fragmentation influences screening: smaller adhesive particles can be harder to remove. Its scope concerns adhesive applications in printed paper products, so confirm its relevance before treating a result as packaging approval.
For product-family information, review our polyolefin hot melt adhesives. Request evidence for the proposed grade and construction before assigning a recycling claim to it.
Buyer Matrix: Match Each Claim to Its Evidence
Use this matrix to structure supplier questions. Agree on the relevant test and acceptance criteria with the laboratory and customer.
| Supplier claim | What must be identified | Method or evidence to request | Recycling route | Main limitation |
|---|---|---|---|---|
| “Recycling-compatible hot melt adhesive” | Named grade, deposit and bonded construction | Relevant adhesive assessment plus evidence for the finished package | Specified paper recycling process | A grade statement alone does not cover every package |
| “Repulpable adhesive” | What the term means for the bonded paper | Paper disintegration results and downstream separation assessment | Defined paper process | Fibre release does not establish adhesive removal |
| “Tested to the Cepi method” | Exact sample and components included | Method part, version and complete laboratory report | Conventional process for Part I | A method reference alone does not state the evaluation outcome |
| “Low adhesive content” | Measured mass per package and application pattern | Production measurements and corresponding package test | Intended paper stream | A small percentage is not a pass criterion by itself |
| “Wash-off label adhesive” | Label, container and wash conditions | Evidence for that specific label/container recycling system | Specified bottle or plastics process | A PET wash-off result cannot establish paper recycling compatibility |
| “Solvent-free” or “bio-based” | Meaning and scope of the material claim | Separate evidence for the packaging recycling claim | Must be independently specified | These descriptions do not replace a recyclability assessment |
Check Rejects, Stickies and Recovered Sheet Quality
The Cepi Part I method examines more than whether paper breaks apart. It includes coarse and fine screening, reject characterisation, sheet adhesion and visual assessment. Its specified screening stages use 5 mm holes and 150 µm slots. These are laboratory equipment dimensions, not universal limits for acceptable glue beads.
Ask the laboratory to explain the measured fractions and sheet observations together. Avoid interpreting a reject percentage as the percentage of adhesive removed: the rejected material can include other constituents and fibres.
Stickies are tacky contaminants that can interfere with papermaking. FEICA notes that packaging components other than adhesives may also generate them. Finding stickies therefore calls for investigation of the construction before assigning the cause to one material.
For a comparative investigation, propose a reference construction and a candidate construction with the same board, printing and other components. Have the laboratory confirm whether that comparison can isolate the proposed adhesive change.
Also review dissolved and colloidal substances where the assessment includes them. The 4evergreen protocol considers these alongside screening yield and sheet quality. Record the reported result rather than assuming that removing visible particles accounts for all material entering the process water.
Read the Test Method and Report Scope
Record three separate items in the approval file:
- Laboratory method: how the sample was processed and measured.
- Evaluation protocol: how those measurements were interpreted.
- Approved scope: which construction, recycling route and claim the outcome supports.
Cepi Part I, Version 3, February 2025, models conventional paper recycling without flotation deinking or specialised treatment. Its measurements can support evaluation using the relevant 4evergreen protocol. Ask for both document versions rather than accepting an undated “Cepi tested” statement.
Macrostickies measurement is optional in the Cepi Version 3 method. Confirm whether the laboratory performed it and how the applicable evaluation treats the result. A report without that measurement must not be described as showing zero stickies. Do not extend a measured macrostickies result to every possible tacky contaminant.
Keep the complete report, sample identification, photographs and any deviations together. Request clarification when the report covers only plain board, a model joint or a different adhesive deposit from your production package.
A technical laboratory outcome also needs to be considered alongside collection, sorting and access to the intended recycling process in the destination market.
Preparing trial samples? Discuss the adhesive deposit and sample preparation needed for a package-level test. Include the customer’s requested method or protocol so the discussion starts with the correct evidence requirements.
Link Adhesive Amount to the Tested Construction
Record adhesive use in grams per finished package. For coatings, also record coated area and coat weight. For beads or dots, document the pattern and dimensions.
Illustrative calculation: a finished package weighing 200 g and containing 0.8 g of adhesive has an adhesive mass share of:
0.8 ÷ 200 × 100 = 0.4%
This is a composition calculation, not a recycling test result or an acceptance threshold.
Use our hot melt adhesive consumption guide to organise production measurements. The Cepi sampling procedure requires test portions to preserve the proportions of components such as labels and hot melt applications. Let the laboratory specify how to represent your package.
Before approval, agree on a change-control rule. A different grade, bead pattern, adhesive quantity, coating or label should trigger a review of whether existing evidence still applies. The laboratory or assessment owner can determine whether additional testing is needed.
Maintain the required bond performance during any adhesive-reduction trial. Our packaging hot melt adhesive guide covers carton-sealing selection and bond checks.
Documents Buyers Should Request
Build the purchasing file around a traceable package specification:
- Construction record: board, coatings, printing, attached components and adhesive locations.
- Grade identification: proposed product code, current TDS and SDS, with batch information for tested material.
- Application record: adhesive quantity, pattern, production conditions and permitted variation.
- Test evidence: laboratory, report number, sample description, method version, results and stated limitations.
- Evaluation record: applicable protocol, outcome and the exact wording supported for the customer.
- Commercial requirements: trial quantity, estimated monthly use, destination market and quotation needs.
Our guide to hot melt adhesive TDS, SDS and COA explains their purchasing roles. Ask separately for recycling evidence linked to the proposed use.
If a supplier cites a certificate, check the named product, issuing organisation, scope, restrictions and validity. Record whether it concerns the adhesive application, a particular packaging construction or another defined subject.
How PPWR Affects the Evidence Discussion
The EU Packaging and Packaging Waste Regulation, Regulation (EU) 2025/40, generally applies from 12 August 2026. Recyclability provisions have later, staged application dates, including requirements linked to 2030. Their detailed scope and timing must be checked against the relevant provisions.
For purchasing teams, this makes it sensible to organise construction specifications and supporting reports early. This is a procurement recommendation; a paper recycling laboratory report alone does not establish full PPWR compliance.
Keep food-contact assessment separate. Where relevant, follow our food-contact hot melt adhesive guide alongside the recycling review.
Frequently Asked Questions
Is hot melt adhesive recyclable with cardboard?
Cardboard packaging containing hot melt can be compatible with paper recycling. Establish the scope using evidence for the grade, application and package in the intended process. A chemistry name alone cannot settle the question.
Is polyolefin hot melt automatically better than EVA for paper recycling?
Compare the proposed grades under relevant application and test conditions. A PO or EVA label does not describe the complete formulation, deposit or recycling outcome.
Does using less hot melt guarantee a recyclable package?
A lower adhesive quantity does not guarantee an acceptable result. Record the actual deposit and assess it with the complete construction while maintaining the required bond.
Does a clean-looking laboratory sheet prove there are no stickies?
A photograph cannot establish that conclusion. Review the reported measurements, adhesion observations, detection scope and any optional tests performed.
Can a PET label wash-off approval support a paper recycling claim?
It addresses a different recycling system. Request evidence relevant to the paper package and its intended route.
Discuss Your Packaging and Adhesive Requirements
Send KAISUN your board specification, construction photographs, adhesive use, application equipment, destination market and any customer test requirements. Add the trial quantity and estimated monthly demand when requesting a quotation.
Identify any existing report and the construction it covers. This gives the technical and purchasing discussion a clear starting point for candidate selection, trial materials and evidence requirements.
Send your packaging specification and discuss trial materials.
