A food contact hot melt adhesive is not a universal chemistry or a blanket certificate. It is a specific adhesive grade whose composition has a valid regulatory basis for a defined use. The finished package must also be made and used within the conditions covered by that basis.
For a packaging buyer, a statement such as “complies with 21 CFR 175.105” is only a starting point. You still need to confirm the product code, package construction, adhesive location, food type, filling and storage temperatures, contact time, use level, and any functional barrier. A technically strong adhesive can be unsuitable if the supplier’s compliance statement does not cover the real application.
For this reason, a hot melt adhesive for food packaging should be approved together with the package design and production process, not as an isolated raw material.
This guide supports supplier qualification and packaging development. It is not a legal opinion, and it does not replace a compliance assessment of the finished food-contact article for its intended market.
What “food contact hot melt adhesive” should mean to a buyer
Terms such as “food safe,” “food grade,” and “FDA approved” are often used loosely in product listings. They do not tell a buyer enough to approve an adhesive.
| Supplier claim | What the buyer should verify |
|---|---|
| Food grade hot melt | The exact regulation or other authorization, product code, intended use, and limitations |
| FDA compliant | Which provision applies, such as 21 CFR 175.105, and whether every relevant component and use condition is covered |
| FDA approved | Whether the supplier means an applicable regulation, an effective Food Contact Notification, GRAS status, prior sanction, or another valid route |
| Suitable for indirect food contact | Where the adhesive sits in the package, what separates it from food, and whether seam, edge, set-off, or gas-phase transfer can occur |
| Migration tested | What construction was tested, which analytes or endpoints were evaluated, and whether the food simulant, time, and temperature represent the intended use |
The wording matters because FDA authorization is tied to the identity of a substance, its specifications, its intended use, and its conditions of use. FDA advises manufacturers to evaluate all four rather than relying on the presence of a chemical name in a list.
A supplier can provide a letter of guaranty or a detailed regulatory status letter for the particular grade and application. See the FDA’s guidance on determining the regulatory status of food-contact material components.
Classify the contact scenario before selecting the adhesive
The first compliance question is where the adhesive can contact food. A package drawing is more useful than the phrase “indirect contact.”
Adhesive behind a functional barrier
Under 21 CFR 175.105, an adhesive may be separated from food by a functional barrier. The buyer must still show that the real structure functions as the intended barrier throughout filling, storage, distribution, and consumer use.
Do not assume that every film, coating, or paper layer is a functional barrier. Thickness, material, package geometry, temperature, storage time, and the substances that could migrate all affect the assessment. Pinholes, incomplete seals, cut edges, and damage during transport may also change the exposure path.
Adhesive used without a functional barrier
Section 175.105 also addresses limited contact when there is no functional barrier:
- For dry food, the amount of adhesive contacting the food must not exceed the limits of good manufacturing practice.
- For fatty and aqueous food, contact is limited to trace amounts at seams and exposed laminate edges within good manufacturing practice.
- Under normal use, the seams or laminates must remain firmly bonded without visible separation.
This is not a general authorization to coat food directly with adhesive. The location and amount of possible contact must match the conditions in the regulation and any limitations that apply to the ingredients.
Pressure-sensitive labels or tapes applied directly to food
A label or tape applied directly to poultry, dry food, or certain processed fruits and vegetables may fall under the more specific conditions in 21 CFR 175.125.
A generic 21 CFR 175.105 adhesive statement should not be used as a substitute for checking this direct-contact route.
Typical packaging scenarios
| Application | Likely contact question | What must be verified |
|---|---|---|
| Secondary corrugated case with a sealed inner food bag | Is the inner bag an effective barrier for the intended conditions? | Bag material, integrity, closures, storage temperature, and foreseeable damage |
| Folding carton for dry cereal or snacks | Can adhesive contact dry food through an open seam or edge? | Bead location, inner liner, package geometry, use level, and GMP controls |
| Tray or carton for fatty or aqueous food | Can more than a trace amount appear at a seam or exposed edge? | Seam design, squeeze-out control, bond integrity, food type, temperature, and contact time |
| Flexible laminate with an adhesive layer between films | Can substances migrate through a film or transfer by set-off? | Full layer structure, film thicknesses, adhesive coat weight, storage, and migration assessment |
| Label on the outside of a bottle, can, or pouch | Does the container wall provide the needed separation? | Container material, label location, application rate, and intended thermal process |
| Produce sticker or tape applied directly to food | Does 21 CFR 175.125 or another specific basis cover it? | Adhesive composition, permitted food category, use level, and direct-contact test conditions |
| Repair of food-processing equipment | Is this a packaging use at all? | Separate food-equipment, hygienic design, cleaning, and operating requirements |
How to check a 21 CFR 175.105 adhesive claim
Section 175.105 sets both formulation and use conditions. Buyers should verify four parts of the claim.
1. Confirm the formulation has an authorization basis
The adhesive may contain substances listed in paragraph 175.105(c), substances recognized as safe for the intended food or food-packaging use, substances covered by prior sanction, and substances permitted by other applicable regulations. Ingredient-specific restrictions still apply.
Finding one base polymer, tackifier, wax, antioxidant, or stabilizer in a regulation does not establish compliance for the whole hot melt. The supplier must assess the complete formulation, including additives, impurities, and any applicable concentration or use restrictions.
2. Confirm the intended use matches the regulatory basis
A compliance statement should describe the use rather than repeat a regulation number. Ask whether it covers:
- Dry, aqueous, acidic, alcoholic, or fatty foods
- Room-temperature filling, hot fill, pasteurization, refrigeration, frozen storage, reheating, or retort conditions
- Direct contact, limited seam or edge contact, or separation by a functional barrier
- The proposed adhesive application weight or maximum use level
- Single-use or repeat-use articles, where relevant
- Any exclusions, such as infant formula, human milk, or particular food and temperature combinations
FDA publishes standard food types and conditions of use. Use them when they are referenced by a regulation, notification, or supplier statement.
Do not treat a broad phrase such as “all food packaging” as equivalent to a defined condition of use.
3. Verify any Food Contact Notification through the supply chain
Some components or uses rely on an effective Food Contact Notification, commonly shortened to FCN. FDA’s inventory of effective FCNs identifies the substance, notifier, manufacturer or supplier, intended use, limitations, and effective date.
An FCN is effective only for the manufacturer or supplier identified in the notification and for the stated substance and use. If the adhesive supplier cites an FCN, ask how the sourced raw material connects to the listed manufacturer or supplier.
A matching chemical description from an unrelated source is not enough.
4. Check the general provisions and container label
21 CFR 174.5 requires food-contact article components to have purity suitable for their intended use. It also limits the amount used to no more than reasonably required for the intended effect when no other limit is specified.
Section 175.105 separately states that the finished adhesive container must bear the statement “food-packaging adhesive” to help assure safe use. Include the product label in the incoming-document review rather than checking only the technical data sheet.
A seven-step compliance verification workflow
Step 1: write an intended-use specification
Build one application record before requesting samples. At minimum, record the following:
| Field | Information to provide |
|---|---|
| Sales market | United States, European Union, individual EU Member State, or other destination |
| Package format | Case, carton, tray, cup, pouch, label, tape, laminate, or another construction |
| Complete material stack | Paper or board grade, coatings, inks, films, foil, inner liner, recycled content, and layer thicknesses |
| Adhesive location | External seam, internal seam, interlayer, label, closure, or another defined position |
| Contact type | Functional barrier, possible edge or seam contact, set-off, gas-phase transfer, or intended direct contact |
| Food profile | Dry, aqueous, acidic, alcoholic, fatty, frozen, or a specific food product |
| Thermal history | Filling temperature, thermal processing, cooling, storage, transport, and consumer reheating |
| Contact duration | Time between packing and end of shelf life, including distribution |
| Adhesive use | Bead pattern or coat weight, maximum application, and package area or food mass used in the assessment |
| Production process | Application temperature, open time, compression time, line speed, and expected stoppages |
This intended-use specification prevents a supplier from approving a vague description that differs from the production package.
Step 2: obtain a grade-specific regulatory status letter
The letter should identify the adhesive manufacturer, exact product name and code, document date, revision, and intended market. It should state the applicable regulatory basis and the conditions under which the grade is suitable.
Ask the supplier to include:
- Whether the adhesive is intended for use under 21 CFR 175.105, 21 CFR 175.125, an effective FCN, or another stated basis
- The permitted contact scenario and any required barrier
- Covered food types and temperature or time conditions
- Use-level or application restrictions
- Relevant exclusions
- Whether the statement depends on raw materials from named manufacturers or suppliers
- A change-notification commitment for changes that could affect regulatory status
The supplier does not have to publish its full formulation. It does need to provide enough information for the packaging manufacturer or its qualified assessor to reach a documented decision.
Confidential composition details can be supplied under an NDA or directly to an independent laboratory when necessary.
Step 3: trace every cited authorization
Review the supplier’s references against current official sources. For each cited regulation or FCN, check identity, specifications, limitations, and conditions of use. Record the review date and retain the source or controlled link in the approval file.
Repeat this check after:
- A material or formulation change
- A raw-material supplier change
- A manufacturing change that can affect the product
- A relevant regulatory update
- Expansion into a new food category
- Expansion into a higher temperature or longer contact condition
A statement written for frozen dry food does not automatically cover a fatty hot-fill product.
Step 4: assess the finished package construction
Draw a cross-section showing the food, every packaging layer, the adhesive, seams, cut edges, and printed surfaces.
Include set-off during reel or stack storage, where a non-food-contact surface may touch a food-contact surface before filling.
For barrier-based conclusions, document why the layer is suitable for the substances, thickness, time, and temperature involved. The term “functional barrier” should be the result of an assessment, not a label assigned to any film between adhesive and food.
Step 5: decide whether modelling, calculation, or migration testing is needed
The decision depends on:
- Available composition data
- Potential migrants
- Barrier properties
- Adhesive application amount
- Package geometry
- Food type
- Contact duration
- Filling, processing, storage, and reheating temperatures
A suitable assessment may use worst-case calculation, migration modelling, analytical testing, or a combination.
When testing is required, the finished adhesive-containing article is normally more representative than testing a pellet or block of neat adhesive. The FEICA guidance on migration testing of adhesive applications recommends testing the finished article wherever possible and treating tests on the adhesive alone as screening unless the method is justified.
The test plan should represent the worst foreseeable case, including:
- The highest approved adhesive coat weight or bead size
- The shortest migration path and thinnest relevant layer
- The most demanding covered food or food simulant
- The longest intended contact time
- The highest relevant filling, processing, storage, or reheating temperature
- Edge exposure, set-off, and volatile transfer where applicable
Sensory evaluation may also be needed because a package can be unacceptable if it changes food odor or taste even when the bond remains intact.
Step 6: audit manufacturing controls and traceability
Compliance depends on making the same adhesive consistently. Review controls for:
- Raw-material approval
- Formulation versioning
- Weighing and batch records
- Contamination prevention
- Equipment cleaning
- Batch release
- Nonconforming material
- Retained records
- Lot traceability
- Regulatory change notification
For EU supply, Regulation (EC) No 2023/2006 requires documented quality assurance, quality control, and relevant manufacturing records for food-contact materials and articles.
A general ISO 9001 certificate can support supplier qualification, but it does not replace grade-specific food-contact information.
Step 7: validate the bond on the actual packaging line
Regulatory suitability does not prove that the adhesive will hold the package. A seam that opens can create an exposure route that the compliance assessment did not assume.
Run the candidate on production substrates at the proposed:
- Application temperature
- Bead pattern or coat weight
- Line speed
- Open time
- Compression time
- Melter and hose settings
Include starts, short stops, long stops, and the highest realistic adhesive residence time in the melter.
Check for:
- Stringing or tailing
- Adhesive squeeze-out
- Char or gel formation
- Nozzle stability
- Odor
- Set speed
- Deposit consistency
- Fiber tear or the appropriate failure mode
- Package deformation
- Open or lifted seams
Condition finished packages through the intended thermal and distribution cycle. That may include hot filling, refrigerated storage, freezing, temperature cycling, or warm transport.
Use the separate guide to packaging hot melt glue selection and line trials for the processing side of the approval.
The minimum document pack for supplier approval
| Document | What it supports | What it does not prove by itself |
|---|---|---|
| Grade-specific food-contact status letter or letter of guaranty | Regulatory basis, intended use, and limitations for the named grade | Compliance of every finished package design |
| Current technical data sheet | Application temperature, viscosity, open time, set behavior, storage, and handling guidance | Food-contact authorization |
| Safety data sheet | Hazard communication and workplace handling | Suitability for food contact |
| Product label | Identity, lot information, handling statements, and the required “food-packaging adhesive” wording where 175.105 applies | Correct use in the buyer’s package |
| Certificate of analysis or conformity | Batch values against agreed release specifications | Full formulation status or migration compliance |
| Authorization support | Applicable CFR citations, FCN references, GRAS or prior-sanction basis, and restrictions | Coverage beyond the stated identity and use |
| Migration or risk-assessment report | Evaluation of specified migrants and conditions in a defined construction | Other structures, higher use levels, longer contact, or harsher temperatures |
| Change-control statement | Notice of changes that may affect compliance or performance | Automatic approval of the changed product |
| Traceability record | Connection among adhesive batch, production date, raw-material lots, and shipped goods | Suitability of the application design |
A TDS, SDS, or COA alone is not a food-contact compliance file. Buyers need the regulatory basis and intended-use boundaries in writing.
United States and European Union requirements are not interchangeable
| Topic | United States | European Union |
|---|---|---|
| Main framework for packaging adhesives | 21 CFR 175.105 plus general provisions and any ingredient-specific regulation, FCN, GRAS basis, prior sanction, or exemption | Regulation (EC) No 1935/2004, Regulation (EC) No 2023/2006, applicable material-specific rules, and relevant national provisions |
| Finished article principle | Authorization must match substance identity, specifications, intended use, and conditions | The finished article must not endanger health, unacceptably change food composition, or deteriorate organoleptic properties under normal or foreseeable use |
| Adhesive-specific harmonized measure | Section 175.105 provides specific conditions for adhesives | No EU-wide material-specific measure has been adopted for adhesives |
| Plastics rules | Relevant CFR provisions and FCNs depend on the component and use | Regulation (EU) No 10/2011 governs plastic layers and affects adhesive-containing plastic articles, but it is not a stand-alone adhesive approval |
| Supply-chain document | Grade-specific regulatory status letter or letter of guaranty with supporting basis | Adequate information from the adhesive supplier, plus the declarations and supporting documents required for regulated materials in the final article |
| Traceability | Buyer and supplier controls should connect the approved grade to shipped lots and the finished package | Article 17 of Regulation 1935/2004 requires traceability through manufacture, processing, and distribution |
Under Regulation (EC) No 1935/2004, the finished material or article must not transfer constituents at levels that endanger health, unacceptably change food composition, or deteriorate taste or odor.
FEICA’s food-contact status declaration guidance for adhesives explains that the adhesive supplier provides adequate information, while the manufacturer of the final package verifies compliance for the real construction and use.
This distinction matters for export projects. A letter written only around 21 CFR 175.105 does not establish EU compliance, and an EU-oriented statement does not automatically establish a valid US authorization.
Choose adhesive chemistry after the compliance screen
EVA, metallocene polyolefin, pressure-sensitive hot melt, and reactive PUR can each be used in packaging, but regulatory status belongs to the particular formulation and intended use. It does not belong to the chemistry family as a whole.
| Chemistry | Common packaging role | Points to evaluate after document screening |
|---|---|---|
| EVA hot melt | Case and carton sealing, tray forming, paper converting | Board wetting, set speed, heat stability in the tank, odor, cold or heat performance, and char formation |
| Metallocene polyolefin hot melt | High-speed packaging, coated or recycled board, cleaner-running systems | Substrate compatibility, set window, thermal stability, application amount, and service-temperature range |
| Hot melt PSA | Labels, tapes, peel-and-seal features, and resealable formats | Tack, peel, migration path, label stock, direct versus indirect contact, and whether 21 CFR 175.125 applies |
| Reactive PUR hot melt | Selected laminating or high-demand bonding uses | Full cure, residual reactive species, migration assessment, moisture control, and package converting time |
If you are comparing non-reactive packaging grades, the EVA versus polyolefin hot melt guide explains the processing differences.
For labels and tapes, review the PSA hot melt adhesive range only after defining the contact route.
Low odor, clear color, low application temperature, bio-based content, or solvent-free formulation can be useful product attributes. None establishes food-contact compliance on its own.
A practical approval matrix for samples and production trials
| Gate | Check | Approval evidence |
|---|---|---|
| 1. Document review | Product code, current regulatory letter, use conditions, exclusions, TDS, SDS, and change control | Signed review against the intended-use specification |
| 2. Incoming sample | Label, lot number, packaging condition, appearance, and agreed certificate values | Sample receipt record linked to supplier documents |
| 3. Bench test | Wetting, bead placement, open time, set behavior, squeeze-out, odor, and bond failure mode | Results on actual production materials |
| 4. Pilot run | Startup, steady production, stops, restart, nozzle behavior, deposit consistency, and line speed | Recorded settings and samples from each operating phase |
| 5. Package conditioning | Intended filling, storage, transport, thermal cycles, and shelf-life checkpoints | Bond and package-integrity results at defined times |
| 6. Compliance verification | Barrier assessment, calculation, modelling, migration, or sensory work selected by risk assessment | Qualified report for the finished structure and intended use |
| 7. Release | Final settings, approved use level, document revisions, lot traceability, and deviation process | Controlled product and process specification |
Set the numeric acceptance limits from the package specification, customer requirements, applicable standards, and validated production capability.
Do not invent a universal peel value or fiber-tear percentage for every food package.
Red flags that should stop approval
Pause the project if any of these appear:
- The supplier offers only a generic “FDA certificate” with no product code or intended use.
- The letter cites 21 CFR 175.105 but does not define contact type, food type, or temperature conditions.
- An FCN is cited, but the raw-material manufacturer or supply chain does not match the notification.
- The supplier treats an SDS or COA as proof of food-contact compliance.
- The barrier conclusion is based only on the presence of a film or paper layer.
- The migration report tested neat adhesive under conditions unrelated to the finished package and provides no justification.
- The compliance letter covers a product family rather than the grade delivered.
- The supplier will not notify buyers about formulation or raw-material changes that may affect the assessment.
- The production trial checks room-temperature bond strength but omits the actual filling, storage, or transport cycle.
- Marketing terms such as “non-toxic,” “low odor,” or “eco-friendly” replace a regulatory basis.
Copy-ready RFQ for a hot melt adhesive for food packaging
“`text
Project: Food packaging hot melt adhesive qualification
Destination market(s):
Applicable customer or retailer requirements:
Package type:
Complete material construction and layer thicknesses:
Board, film, coating, ink, and recycled-content details:
Adhesive location and bead pattern or coat weight:
Maximum proposed adhesive use:
Food product and food category:
Direct contact, seam or edge contact, set-off, gas-phase transfer, or functional barrier:
Filling temperature:
Thermal processing after filling:
Storage and transport temperature range:
Maximum food-contact duration and shelf life:
Consumer reheating or cooking conditions:
Application equipment:
Target application temperature:
Line speed:
Open-time and compression-time window:
Known bond or machining problems:
Please provide for the exact recommended grade:
- Grade-specific food-contact regulatory status letter or letter of guaranty
- Applicable 21 CFR, FCN, or other authorization references and use limitations
- Covered food types, conditions of use, contact route, and exclusions
- TDS, SDS, product label, and available COA or certificate format
- Available migration, sensory, or risk-assessment support relevant to this construction
- Manufacturing location, lot-traceability approach, and change-notification policy
- Recommended starting settings and sample quantity
- Shelf life, storage conditions, packaging format, MOQ, and lead time
