01 LAMINATE INTERFACE EVIDENCE
Lamination bond strength vs seal strength: keep the interfaces separate
A laminate bond result and a heat-seal result usually belong to different interfaces. Lamination bond or ply adhesion concerns separation between bonded plies; seal strength concerns separation of a seal made between package surfaces. Name the exact interface and method before comparing any force result.
02 DECISION FRAME
A force result cannot move from one interface or method to another.
ASTM F904-22 is a Standard Practice for separating plies so that a later bond-strength or ply-adhesion measurement can be made; it does not define that later numerical measurement. ASTM D1876-08(2023) and ISO 11339:2022 are adhesive-bond T-peel contexts for flexible adherends or flexible-to-flexible bonded assemblies, while ISO states that its procedure provides no design information. They do not automatically apply to every extrusion-coating, laminate or coextrusion interface within the F904 separation scope; the responsible laboratory must confirm applicability to the exact construction and interface. ASTM F88/F88M-23 measures the force required to separate a seal and identifies specimen failure mode; its technique and the bending component can affect the result. These scopes do not establish method equivalence or a conversion between reported values.
- A film or foil laminate quotation that lists bond strength without identifying the tested interface
- A delamination or weak-seal investigation where two different separation events must be assigned correctly
- A sample, trial or receiving comparison that mixes TDS, COA, laboratory and package-seal evidence
- That equal-looking force-per-width units make different interfaces, geometries or methods comparable
- That ASTM F904-22 itself supplies a numerical bond-strength result or that ASTM D1876, ISO 11339 and ASTM F88 are equivalent
- That an adhesive T-peel context in ASTM D1876 or ISO 11339 automatically applies to every extrusion-coating, laminate or coextrusion interface separated under ASTM F904
- That wetting tension, deposited-metal adhesion, a laminate bond result or a seal result proves any of the others
03 COMPARISON MAP
Keep interface, specimen and evidence role attached to every force result.
Use the table to identify what separated, how the specimen was prepared and loaded, what was reported and which purchasing decision the record can support.
Swipe or scroll horizontally to review every evidence column.
| Decision field | Lamination bond / ply adhesion | Heat-seal strength | RFQ / report control |
|---|---|---|---|
| Measured interface | The identified boundary between two bonded plies in a laminate | The identified seal between the two package sealing surfaces | Complete layer and side map with the exact interface highlighted |
| Standard's job | ASTM F904-22 separates plies to enable a later bond measurement; ASTM D1876 or ISO 11339 remains an adhesive T-peel candidate only when the responsible laboratory confirms the exact interface is applicable | ASTM F88/F88M-23 measures the force required to separate a seal and records specimen failure mode | Exact standard, edition, laboratory procedure reference and stated applicability |
| Specimen source | Identified laminate, production stage, lot or roll and interply boundary | Laboratory-made or commercial seal with its web, package and seal location | Specimen identity, preparation source, conversion stage and traceability |
| Geometry & technique | T-peel or another agreed geometry under its selected current procedure | ASTM F88 Technique A, B or C, or another explicitly agreed seal method | Orientation, fixture, support, grips and pull conditions reported as used |
| Direction & location | MD, TD or another cut direction plus cross-web and machine-direction sample location | Seal orientation, package position and direction of the test strip | Controlled cutting map tied to roll, pouch or package identity |
| Age & conditioning | Lamination date, green or cured state, age, storage and test conditioning | Seal-making source, time before test, storage and conditioning | Temperature, humidity, time and any buyer-approved exposure stage |
| Reported result | Relative peel resistance or other output defined by the chosen bond method | Seal separation force with the selected maximum, average or other stated output | Original unit, statistic, calculation basis, variability and raw-record reference |
| Failure mode | Observed interply, adhesive, cohesive, coating, metal-layer or material failure using agreed vocabulary | Observed seal separation, material tear, delamination, distortion or other reported specimen failure | Failure category, location, photographs or notes and mixed-mode handling rule |
| Evidence role | Buyer requirement, supplier specification, TDS typical value, lot record or laboratory report | Buyer requirement, seal study, line-trial result, lot record or finished-package report | Keep every value attached to its document role, revision and acceptance owner |
| Release decision | Approval of the exact laminate interface at the stated cure and specimen stage | Approval of the exact sealing surfaces under the stated seal and test basis | Separate comparator, retest, nonconformance and change-control rules |
04 SELECTION SEQUENCE
Move from a broad comparison to an approvable decision.
Mark the interface before naming the test
Draw the full structure and identify whether the decision concerns an interply bond, deposited layer, coating, printed surface or package seal.
Attach method and specimen state
Preserve the current method, geometry, direction, cure or seal age, conditioning, result expression and failure mode beside every value.
Approve the exact structure and stage
Keep supplier documents, trial evidence and receiving records in separate roles, then release only the identified laminate interface and seal decision.
05 RFQ INPUTS
Lamination bond and seal-strength RFQ checklist
Request one interface map and two separate evidence rows when both laminate bond and heat-seal strength matter. Unknown fields stay open rather than being filled with a generic value or method conversion.
Open the RFQ brief builder ↗- 01
Packed product, package format, current issue and the purchasing or qualification decision this evidence must support
- 02
Complete laminate construction in order, with substrate, coating, print, metal, primer, adhesive and sealing surfaces identified where applicable
- 03
Exact interply bond or heat-seal interface highlighted on a controlled layer-and-side map
- 04
Material, grade or document identifiers, supplier revisions, adhesive or coating identity and declared exclusions supplied by the responsible parties
- 05
Batch, lot, roll, pouch or package traceability plus lamination, seal-making and test dates
- 06
Decision metric and exact current standard, edition, laboratory procedure reference and applicability statement
- 07
Specimen source and stage, including green or cured laminate status, laboratory or commercial seal source and time before test
- 08
Specimen width, MD or TD orientation, cutting and cross-web location, preparation record and replicate or sampling basis
- 09
Peel geometry, fixture, grips, support technique, pull conditions and any ASTM F88 Technique A, B or C designation
- 10
Conditioning temperature and humidity, storage history, specimen age and any buyer-approved exposure stage
- 11
Original result, unit, maximum, average or other stated statistic, variability, calculation basis and raw-data reference
- 12
Observed failure mode, failure location, photograph or note reference and rule for mixed or changing modes
- 13
Buyer requirement, supplier specification, TDS typical value, lot COA, independent report and trial result retained as separate evidence roles
- 14
Separate bond and seal comparators, acceptance owner, retest rule, nonconformance disposition, representative conversion check and change-control trigger
06 EVIDENCE BOUNDARY
Method names do not create equivalent results or a LayerSource capability
ASTM F904-22 is the current Standard Practice for separating plies of laminated flexible materials so that later bond measurement can be performed; it is not the numerical bond measurement itself. ASTM D1876-08(2023) is an adhesive-bond T-peel context for relative peel resistance between flexible adherends. ISO 11339:2022, Edition 4, is an adhesive-bond T-peel context for flexible-to-flexible bonded assemblies and states that the procedure provides no design information. Neither adhesive T-peel context automatically applies to every extrusion-coating, laminate or coextrusion interface within the F904 separation scope; the responsible laboratory must confirm the current licensed method's applicability to the exact construction and interface. ASTM F88/F88M-23 covers seal separation force and failure mode; its public significance text explains that support technique and bending can affect the result. This page reproduces no paid procedure, declares no equivalence or cross-method conversion and supplies no fixed bond or seal value. The sources do not establish a LayerSource film, foil, adhesive or grade; lamination, coating, sealing or laboratory capability; cure schedule; retort, boil, freezer or food-contact suitability; test result; or production outcome. The buyer, supplier, converter and responsible laboratory must select the applicable licensed procedure and approve the exact interfaces, specimens, conditions and release rules.
07 BUYER QUESTIONS
Resolve the assumptions that make quotes diverge.
01Are lamination bond strength and heat-seal strength the same result?+
No. Lamination bond or ply adhesion concerns the identified boundary between bonded plies. Heat-seal strength concerns the identified seal between package surfaces. Keep each interface, method, specimen and failure mode in its own evidence row.
02Does ASTM F904-22 produce a numerical bond-strength value?+
No. The current document is a Standard Practice describing how plies can be separated to enable a later bond-strength or ply-adhesion measurement. The responsible parties must identify the applicable measurement procedure separately.
03Are ASTM D1876 and ISO 11339 results automatically interchangeable?+
No. Both are adhesive-bond T-peel contexts involving flexible adherends, but they are not automatically applicable to every extrusion-coating, laminate or coextrusion interface that ASTM F904 can separate, and no equivalence or result conversion is asserted here. The responsible laboratory must confirm applicability to the exact construction and interface, then preserve the edition, specimen, geometry, preparation, conditioning, output and laboratory record.
04Why must ASTM F88 technique and failure mode accompany seal strength?+
ASTM's public text explains that support technique and the bending component can affect the measured response, and the method identifies specimen failure mode. The technique, material orientation and observed failure therefore belong beside the force result.
05Can two force-per-width results be compared when the units match?+
Not from units alone. The interface, method, geometry, specimen width and direction, support, age, conditioning, statistic and failure mode must also support the same buyer decision. No cross-method normalization is supplied by this page.
06What closes a laminate bond and seal-strength approval?+
The buyer and responsible suppliers must approve separate requirements for the exact interply bond and sealing surfaces, then retain current method, specimen, trial, failure-mode, acceptance and change-control evidence for each.