Bio-based hot melt adhesive claims need a defined measurement or chain-of-custody basis. Physically measured bio-based content and mass-balance attribution provide different evidence. Neither automatically establishes recyclability, compostability, food-contact suitability or bond performance.
For industrial buyers, approval involves two separate questions: can the supplier substantiate the renewable-content claim, and can the proposed adhesive run reliably in the intended application? Both need an answer before a production order.
This guide explains how to compare claims, check supporting documents and write a purchasing request that suppliers can evaluate.
Have a customer specification to meet? Send KAISUN your renewable-content requirement and target application. Include the requested measurement or certification basis so grade availability and supporting evidence can be discussed.
Define the Claimed Renewable Content
Start by asking what the word “bio-based” describes in the offer. It might refer to a raw material, the finished adhesive’s measured bio-based carbon, a calculated renewable ingredient share, or feedstock attributed through mass balance.
These descriptions should remain distinct throughout the quotation, sample approval and purchasing agreement.
Ask the supplier to identify:
- The exact adhesive grade and product form.
- Whether the claim covers the finished adhesive or selected ingredients.
- The percentage, its denominator and the supporting method.
- Whether the evidence is a laboratory result, a formulation calculation or certified chain-of-custody documentation.
For example, a renewable tackifier statement alone does not establish the renewable content of the complete adhesive formulation.
Also keep feedstock origin separate from adhesive chemistry. “Bio-based” does not identify whether the product is reactive PUR, EVA, a pressure-sensitive adhesive or another formulation. Use the guide to hot melt adhesive types to establish the relevant chemistry and bonding task first.
Physical Content Versus Mass-Balance Attribution
What a Measured Bio-Based Carbon Result Means
ASTM D6866 uses radiocarbon analysis to determine bio-based carbon content. In the USDA BioPreferred definition, the reported percentage relates new organic carbon to total organic carbon.
That percentage is not automatically the percentage of renewable ingredients by total adhesive weight. Carbon content and total product mass have different denominators.
For procurement, ask for the laboratory, report number, method edition, sample identity, testing date and reported result. Confirm how the tested sample relates to the proposed grade. A report for one ingredient does not establish the finished adhesive’s result.
What a Mass-Balance Claim Means
Mass balance is a chain-of-custody approach. Certified and conventional feedstocks can enter shared production systems, while accounting tracks certified inputs and their attribution to outputs under the applicable scheme rules.
The attributed share is not a measurement of the physical bio-based content in each delivered bag or drum. It therefore cannot replace a physical-content test when the customer’s specification explicitly requires one.
Conversely, a physical-content result alone does not verify a certified mass-balance supply chain. Choose the evidence route that matches the purchasing requirement.
Compare the Evidence Before Comparing Percentages
| Claim in the offer | Measurement or allocation basis | Document or certificate object | Scope to check | Purchasing acceptance |
|---|---|---|---|---|
| Measured bio-based carbon | Radiocarbon analysis, such as ASTM D6866 | Identified test sample | Finished adhesive identity, method and result basis | Result meets the agreed carbon-based requirement |
| Renewable ingredients by mass | Defined formulation calculation | Named formulation and its ingredient records | Denominator, ingredient origin and calculation boundaries | Calculation matches the required mass-based definition |
| Mass-balanced renewable feedstock | Certified chain-of-custody attribution | Relevant certified operations and transaction evidence | Scheme, certificate status, material category and supplied quantity | Attribution and documents meet the agreed specification |
| Reduced product carbon footprint | Defined footprint study | Specific product and study boundaries | Baseline, functional unit, scope and assumptions | Comparable evidence supports the exact reduction claim |
The rows describe different evidence routes. A certificate or report in one row should not be used to imply all the others.
Illustrative comparison only: an offer stating “40% bio-based carbon measured by ASTM D6866” and an offer stating “40% renewable feedstock attributed through mass balance” do not report the same property. Neither statement, by itself, means 40% of the delivered adhesive’s total weight is physically renewable material. These figures are examples, not KAISUN product data.
Check Certificate Scope and Transaction Evidence
Verify the Relevant Company and Site
If the offer relies on ISCC PLUS certification, check the official certificate database and the certificate itself. Review the legal entity, relevant operational site, certificate number, status, validity and activity scope.
Match that information to the supply arrangement. A certificate held by an upstream raw-material producer does not, on its own, substantiate a certified claim for a downstream adhesive shipment.
Ask the supplier to explain which certified operations support the proposed product and how the claim passes through the supply chain. Use the scheme’s current requirements when assessing the documents.
Connect the Claim to the Delivered Material
A company certificate and a transaction document serve different purposes. Where applicable, request the Sustainability Declaration or equivalent scheme-required documentation supporting the supply.
For a purchasing review, reconcile the following information across the declaration, order and delivery records:
- Supplier and recipient identities, with the relevant certificate reference.
- Product description and a traceable connection to the ordered adhesive grade.
- Contract or delivery reference, dispatch date and document identifier.
- Certified quantity, units and any separately stated total delivery quantity.
- Feedstock category and the applicable chain-of-custody or attribution basis.
Distinguish the certified part from the total delivery when checking quantities. If one declaration covers several deliveries, confirm that aggregation is permitted and that each relevant shipment remains traceable.
This purchasing checklist does not replace the scheme’s full documentation requirements.
Keep Technical Documents Alongside Claim Evidence
Retain the proposed grade’s TDS and SDS, the agreed incoming-quality documentation, and the documents supporting its renewable-content claim. They answer different questions.
A routine COA is not evidence of bio-based content unless the relevant result and basis are actually included and traceable. For document roles, see the hot melt adhesive TDS, SDS and COA guide.
Need to clarify an offer? Ask which content basis and documents are available for the proposed grade. Share the wording your customer expects to use, including whether physical-content evidence or mass-balance attribution is acceptable.
Separate Bio-Based, Recyclable and Compostable Claims
Renewable sourcing describes an aspect of material origin. It does not establish what happens to the bonded article after use.
| Term | What it addresses | Evidence to request for the intended claim |
|---|---|---|
| Bio-based | Biological origin of material, with a defined content basis | Relevant test result or documented content calculation |
| Mass-balanced | Attribution of certified feedstock through a supply chain | Relevant certification and transaction evidence |
| Recyclable | Compatibility with a specified collection and recycling route | Assessment of the relevant finished construction and recycling conditions |
| Biodegradable | Biological breakdown under defined conditions | Testing that identifies the environment, method and timeframe |
| Compostable | Compliance with specified composting criteria | Applicable certification or test evidence, including the covered construction |
Do not extend an adhesive-level statement to an entire package without checking the scope. Likewise, industrial compostability does not establish suitability for home composting.
Food-contact suitability and lower carbon footprint need their own evidence. For a carbon-reduction comparison, request the baseline product, study boundaries and functional unit. A renewable-content percentage alone does not quantify emissions savings.
Test Bio-Based Hot Melt Adhesive Under the Same Conditions
A renewable-content claim does not predict adhesion, processing stability or service life. Evaluate the proposed grade against the current approved adhesive using an agreed trial plan.
Start with a controlled comparison where both products’ recommended processing windows permit it. If they need different settings, run a documented, grade-appropriate trial as well and identify those differences in the results.
| Trial item | What to record | What to assess |
|---|---|---|
| Substrates | Material, coating, treatment and production lot | Bonding to the actual surfaces used in production |
| Application | Measured adhesive temperature, equipment and application method | Stable delivery within the grade’s recommended window |
| Adhesive quantity | Measured coat weight or bead mass and coverage | Performance at a known adhesive consumption |
| Assembly | Open time, line speed, pressure and hold time | Reliable handling at the required production rate |
| Conditioning | Time, temperature, humidity and cure conditions where applicable | Results after comparable preparation |
| Bond performance | Relevant peel, shear, creep or package-opening method | Agreed limits and observed failure mode |
| Aging and service | Required heat, cold, moisture and load exposure | Retained performance in the intended environment |
For a reactive PUR candidate, include the specified cure conditions. For a pressure-sensitive adhesive, evaluate the relevant tack, peel and shear behavior. Choose tests for the application rather than applying one strength test to every chemistry.
Record trial conditions with the results. A stronger room-temperature bond does not establish resistance to heat or sustained load. For the wider approval process, use the hot melt adhesive sample-testing guide.
Specify the Claim in the Purchasing Request
“Please quote an eco-friendly hot melt” leaves the supplier to guess which evidence you need. State the claim basis and the production requirement together.
Include the following in your RFQ:
| RFQ field | Information to provide |
|---|---|
| Application and substrates | Bonding task, exact materials and relevant surface treatments |
| Process | Equipment, application method, operating conditions and line speed |
| Required claim | Physical bio-based carbon, renewable ingredient mass or mass-balance attribution |
| Target and basis | Required percentage, denominator and accepted method or scheme |
| Claim scope | Adhesive, selected ingredient or finished bonded article |
| Target market | Destination and customer documentation requirements |
| Performance | Existing grade, required tests and acceptance limits |
| Supply | Trial quantity, forecast volume, packaging and delivery needs |
| Evidence | Documents required before sample approval and with deliveries |
If the basis is undecided, ask suppliers to quote physical-content and mass-balance options separately, where available. Compare the supporting evidence before selecting a route.
Use the hot melt adhesive RFQ checklist for the remaining quotation details. For OEM and private-label adhesive projects, agree how the approved claim wording maps to the product code and packaging. Include a review step for formulation or sourcing changes that could affect the claim.
Frequently Asked Questions
Is Physical Bio-Based Content Better Than Mass Balance?
The suitable route depends on the purchasing specification. A requirement for measured bio-based carbon needs corresponding test evidence. A procurement policy that accepts certified attribution may allow mass balance. Compare offers using the same definition and acceptance criteria.
Can ASTM D6866 Verify a Mass-Balance Percentage?
ASTM D6866 measures bio-based carbon in a sample. Mass-balance attribution is verified through chain-of-custody records and applicable certification controls. One does not directly validate the other.
Does a Natural Tackifier Make the Whole Adhesive Bio-Based?
A natural-origin ingredient may contribute renewable material, but it does not establish the complete adhesive’s content percentage. Request evidence for the finished formulation and a clear definition of the percentage being claimed.
Can a Bio-Based Hot Melt Replace an Existing Grade Without a Line Trial?
Renewable sourcing alone does not establish interchangeability. Check processing, bond performance, aging and documentation against the current approval requirements before making a production change.
Discuss Your Application and Evidence Requirements
Before shortlisting a bio-based hot melt adhesive, define the content claim, identify the supporting evidence and agree how the proposed grade will be tested.
You can review KAISUN’s industrial hot melt adhesive range to identify the relevant chemistry. Availability of a grade carrying a particular renewable-content or certification claim requires written confirmation for that product and supply arrangement.
Send your substrates, required claim basis, quantity and target market to discuss grade availability and supporting documents. If you already have a customer specification, attach it so the discussion starts with the requirement you need to meet.
