Author
Hanksec specializes in tamper-evident security label materials, VOID security materials and converter-ready roll stock solutions. Our technical team supports material qualification, printing trials, converting evaluation and application testing for global label converters and OEM customers.
Expertise:
Security Label Materials | VOID Materials | Destructible Materials | Printing & Converting Evaluation
Quick Answer: How Should Security Label Materials Be Quality-Controlled?
For label converters and security printers, choosing a security label material is not only about adhesive strength or visual effects. Material consistency, converting performance and tamper response determine whether the final security label performs reliably in real applications.
Security label material quality control should evaluate more than appearance or initial adhesive tack. For label converters, security printers and technical buyers, a practical qualification process should examine five areas:
- Peel adhesion – whether the adhesive bonds consistently to the intended substrate.
- Release force – whether the laminate separates from the liner predictably during converting and dispensing.
- Die cutting and matrix stripping – whether the material can be converted efficiently without lifting, cracking or liner damage.
- Tamper-evident performance – whether the required VOID, transfer or destructible response appears consistently after removal.
- Printing and code durability – whether ink, barcodes, QR codes and variable information remain clear and usable after printing, handling and converting.
The important point is that these tests should not be evaluated independently.
A security label material is a complete functional system. Facestock + security layer + adhesive + release liner + printable surface + converting process + final application substrate must work together.
That is why a material that looks acceptable on a sample roll can still create serious problems during full production.
| QC Area | Main Question | Typical Production Risk |
|---|---|---|
| Peel Adhesion | Does the adhesive bond correctly to the real substrate? | Edge lifting, weak bonding, unstable tamper effect |
| Release Force | Does the material release consistently from the liner? | Dispensing problems, unstable stripping, downtime |
| Die Cutting & Matrix Stripping | Can the material convert cleanly? | Matrix breaks, liner damage, label lifting |
| Tamper Effect | Does removal create the intended security evidence? | Weak VOID message, resealing risk, inconsistent transfer |
| Printing / Barcode / Rub | Does printed information remain functional? | Ink loss, unreadable codes, poor rub resistance |
For converters, this kind of security label material quality control is one of the most effective ways to reduce waste, production interruptions and customer complaints before bulk production begins.
Why Security Label Material Quality Control Matters
Security label materials may look simple, but their performance depends on the interaction of multiple functional layers.
A roll may look clean. The printable surface may perform well during a short trial. The adhesive may feel strong in a quick hand test.
But these observations do not tell the complete story.
Many quality problems only appear after the material enters printing, die cutting, matrix stripping, rewinding, dispensing or final application.
A security label construction may contain a facestock, printable coating, hidden security layer, release layer, pressure-sensitive adhesive and liner. These layers interact with one another, which is why a security material should be treated as a complete system rather than as a simple adhesive film.
For a deeper explanation of this structure, see Hanksec’s Security Label Material Systems guide.
A converter may purchase a lower-cost material that looks almost identical to another material on a specification sheet. During production, however, the press operator may discover that:
- matrix stripping is unstable;
- the die-cutting window is too narrow;
- the liner is easily damaged;
- printing adhesion changes from batch to batch;
- finished labels begin lifting from the application surface;
- or the expected VOID response is incomplete after removal.
These problems create costs at several stages:
- wasted material;
- press downtime;
- lower converting speed;
- additional machine adjustment;
- failed samples;
- reprinting;
- customer complaints;
- repeat qualification work.
The consequences can be more serious than with an ordinary decorative label because security labels perform a functional role.
They may indicate unauthorized opening, protect warranty points, identify valuable components, secure packages or provide visible tamper evidence.
A security label that does not perform consistently is therefore not simply an unattractive label. Its security function may also be compromised.
Security Label Material Construction: What Should Be Checked Before Testing?
Before starting qualification, the converter should identify the complete construction being tested.
Typical components include:
Facestock
PET, BOPP, paper, destructible film, holographic film or another specialty substrate.
Security layer
A VOID, OPENED, transfer, release or destructible mechanism designed to create visible evidence after removal.
Adhesive
A pressure-sensitive adhesive selected according to the application surface, environment and security response.
Release liner
Glassine, PET or another liner designed to protect the adhesive and control converting or dispensing behavior.
Printable surface or topcoat
A treated or coated surface matched to UV, flexographic, thermal-transfer, digital, inkjet or other printing technologies.
Changing one element can affect another.
For example, changing the adhesive can alter the final VOID response. Changing the liner can change release force. A different printable topcoat may improve ink adhesion while also changing surface friction or converting behavior.
This interaction is why Hanksec recommends qualifying the complete construction under conditions that are representative of the customer’s actual process and application.
Test 1 – Peel Adhesion Test
Peel adhesion is one of the most useful starting points in security label material evaluation.
The goal is not simply to determine whether the adhesive is “strong.”
The real question is:
Does the adhesive create the required and repeatable bond on the intended application surface?
A tamper-evident label depends on controlled interaction between the adhesive, substrate and security construction.
An adhesive that is suitable for glass may not behave the same way on polypropylene. An adhesive that works on coated paperboard may perform differently on textured plastic or painted metal.
Hanksec explains this relationship in more detail in the Tamper Evident Label Adhesive Guide.
What Peel Adhesion Testing Evaluates
A controlled peel test can help assess:
- adhesive bond strength;
- consistency between test specimens;
- differences after dwell time;
- substrate compatibility;
- edge-lift tendency;
- interaction between adhesion and tamper response.
Industry references can also be useful when developing internal QC procedures. ASTM D3330/D3330M covers measurement of peel adhesion for pressure-sensitive tapes, including 180° and 90° methods, while FINAT lists 180° and 90° peel methods for self-adhesive label materials. These should be treated as references unless the complete prescribed method is actually followed. ASTM Store
Test on the Real Application Surface
Depending on the customer’s application, useful substrates may include:
- stainless steel;
- aluminum;
- glass;
- PET;
- PVC;
- ABS;
- PP;
- PE;
- painted metal;
- coated paperboard;
- corrugated or varnished packaging.
This matters especially with PP and PE, where lower surface energy can make adhesive selection more difficult.
The most useful qualification therefore combines a repeatable laboratory reference surface with testing on the actual production substrate.
What Converters Should Observe
Do not record only the force value.
Also check:
- whether the adhesive wets out evenly;
- whether the label edges remain flat;
- whether the facestock stretches or fractures;
- whether adhesive transfers unintentionally;
- whether the required security layer activates during removal;
- whether performance changes after additional dwell time.
Testing after representative dwell periods is especially important because pressure-sensitive adhesive performance can develop after application.
What Better Adhesion Consistency Looks Like
A well-controlled construction normally shows:
- repeatable results between samples;
- stable bonding after the required dwell period;
- fewer edge-lift problems;
- a predictable interaction between adhesion and tamper response.
Warning signs include:
- large variation across samples;
- premature edge lifting;
- poor bonding on the real target substrate;
- uncontrolled adhesive transfer;
- substantial performance changes after storage or aging.
The objective is not automatically to obtain the highest possible peel value. The correct adhesive must support the intended security response and application requirement.
Test 2 – Release Force Test
Release force is one of the most important but frequently misunderstood parameters in roll-label converting.
It describes the force required to separate the adhesive-coated facestock from its release liner.
For a converter, this influences much more than how easily a label can be peeled by hand.
Release behavior can affect:
- dispensing;
- web stability;
- matrix stripping;
- rewinding;
- automatic labeling;
- press speed;
- finished-label handling.
FINAT’s published test-method list distinguishes low-speed release force (FTM 3), high-speed release force (FTM 4), and release-force evaluation for silicone-coated liners (FTM 10), which illustrates why release performance must be considered in relation to the actual converting operation. FINAT
What Happens When Release Force Is Too High?
Excessively high release force may contribute to:
- difficult dispensing;
- increased web tension;
- unstable waste stripping;
- label lifting during matrix removal;
- slower converting or application.
What Happens When Release Force Is Too Low?
Excessively low or poorly controlled release may contribute to:
- premature label separation;
- pre-dispensing;
- web-handling instability;
- inconsistent converting;
- higher waste during production.
A useful QC program should therefore evaluate consistency, not simply one isolated number.
Converters should check whether release behavior is stable:
- across the web;
- along the roll;
- between rolls;
- after storage;
- at representative converting conditions.
Why Release Consistency Matters More Than One Good Result
A single acceptable measurement does not prove production stability.
If release changes significantly from one area of the roll to another, operators may need continuous machine adjustments.
That increases:
- setup time;
- press interruptions;
- waste;
- production variation.
For high-volume converters, repeatable liner release is therefore an important part of production efficiency.
Test 3 – Die Cutting and Matrix Stripping Performance
A material can pass adhesion and release checks and still create major problems on the converting line.
This is why security label material qualification should include a practical die-cutting and matrix-stripping trial.
Security materials can be more demanding than conventional label stock because they may contain:
- fragile facestocks;
- multilayer VOID structures;
- specialty coatings;
- high-tack adhesives;
- thin liners;
- destructible constructions.
For destructible materials in particular, there is an intentional balance between being strong enough to survive printing and converting but fragile enough to break during unauthorized removal. Hanksec’s Destructible Label Material Rolls Selection Guide explains this balance in more detail.
What Should Be Evaluated?
Converters should look at:
- die-cut cleanliness;
- liner integrity;
- matrix removal;
- waste-web continuity;
- label-edge lifting;
- corner lifting;
- small-label stability;
- adhesive ooze;
- fracture of fragile facestock.
The test should preferably be run with a label size and pattern that are representative of the intended production job.
A large rectangular sample may convert easily while a small seal with narrow spacing and sharp corners may behave very differently.
Common Failure Signals
Potential warning signs include:
- matrix breaking repeatedly;
- labels lifting with the waste matrix;
- excessive die pressure;
- liner scoring;
- liner cutting;
- facestock cracking before application;
- adhesive build-up at cut edges;
- unstable stripping at normal production speed.
What Good Converting Performance Looks Like
A production-ready material should provide a sufficiently stable converting window rather than requiring constant operator correction.
Good performance normally means:
- clean die cutting;
- reliable matrix removal;
- acceptable liner protection;
- stable operation at representative speeds;
- minimal unnecessary machine adjustment.
This does not mean every security construction will run under identical settings.
It means the material should behave predictably once the correct process window has been established.
Test 4 – VOID Tamper Effect Test
For VOID security label materials, the final security response must also be tested after converting.
This step confirms whether printing, die cutting, rewinding and application have preserved the intended tamper-evident function.
VOID materials use a controlled multilayer separation mechanism. Buyers who need a deeper explanation of full-transfer, partial-transfer and non-transfer constructions can review Hanksec’s VOID Label Material Guide.
What Should Be Checked?
A practical tamper test should examine:
- clarity of the VOID or OPENED message;
- completeness of the security pattern;
- consistency between samples;
- full-transfer, partial-transfer or non-transfer behavior;
- residue behavior;
- sensitivity after representative dwell time;
- possibility of visually concealing tampering after reapplication.
Test the Actual Application Substrate
This is particularly important.
A VOID material that performs well on glass may behave differently on:
- coated carton;
- painted metal;
- ABS;
- PP;
- PE;
- textured plastic;
- electronics housings.
For that reason, final approval should not rely only on a convenient laboratory surface.
The actual customer substrate should be tested whenever possible.
Transfer Type Must Match the Specification
A full-transfer VOID construction should provide the intended transferred security evidence on the substrate.
A partial-transfer VOID construction should create the specified evidence across both sides of the separated construction.
A non-transfer VOID construction should reveal the security response while meeting the required low-residue or clean-surface objective.
None of these types is inherently “better.” The correct choice depends on the application.
Converters sourcing roll material can also compare the selection factors in Hanksec’s VOID Label Material Rolls Guide.
What Reliable Tamper Performance Looks Like
A properly qualified VOID material should provide:
- clear visible evidence;
- repeatable activation;
- predictable transfer behavior;
- stable response on the specified substrate;
- difficulty in hiding the fact that opening has occurred.
Warning signs include:
- patchy message activation;
- incomplete security patterns;
- inconsistent residue;
- weak response after normal dwell;
- large sample-to-sample variation.
For security applications, a clear and repeatable response is usually more valuable than an impressive-looking effect that only works under ideal conditions.
Test 5 – Printing, Barcode and Rub Resistance Test
Security label materials often need to carry more than a logo.
The printed surface may include:
- serial numbers;
- barcodes;
- QR codes;
- variable data;
- warranty information;
- warning text;
- authentication information.
Print qualification should therefore evaluate both appearance and function.
A detailed discussion of different printing technologies is available in Hanksec’s Printable Security Label Materials Guide.
Printing Methods May Behave Differently
Depending on the application, the material may be printed using:
- UV flexography;
- conventional flexography;
- thermal transfer;
- digital printing;
- pigment inkjet;
- screen printing;
- variable-data overprinting.
A material that works well with one system should not automatically be assumed to work equally well with another.
Topcoat chemistry, ink system, ribbon type, drying, curing and downstream converting can all affect the result.
Printing Qualification Should Check
- ink anchorage;
- print definition;
- curing or drying;
- fine text;
- barcode edge definition;
- QR-code readability;
- rub resistance;
- scratch resistance;
- smudge resistance.
FINAT’s test-method list includes separate methods for basic and advanced ink adhesion (FTM 21/22), UV-print ink rub testing (FTM 27), scratch resistance (FTM 29), and UV-ink drying evaluation (FTM 30). FINAT
For barcodes, simple scanning is useful as a production check, but formal barcode quality evaluation is different from merely asking whether a scanner reads the code. GS1 notes that printed barcode quality can be measured with an ISO/IEC-compliant barcode verifier and that application requirements determine the required minimum quality grade. GS1 GO Customer Service Portal
Why Rub Resistance Matters
A printed image can look excellent immediately after printing and still fail later.
Handling, rewinding, packing, transport or product use may cause:
- ink loss;
- scratches;
- smearing;
- reduced contrast;
- damaged barcode edges.
For that reason, print qualification should continue after printing and curing rather than stopping at visual inspection.
High-Quality vs Low-Quality Security Label Materials
Two materials may look almost identical before production.
Both may be described as:
- VOID PET;
- destructible label material;
- printable security film;
- high-tack security stock.
The difference often becomes visible only after controlled testing.
| Evaluation Area | Better-Controlled Material | Poorly Controlled Material |
|---|---|---|
| Adhesion | Consistent and matched to substrate | Variable bonding, edge lifting |
| Release | Predictable across rolls | High/low variation, unstable dispensing |
| Die Cutting | Stable process window | Frequent adjustment required |
| Matrix Stripping | Continuous and controlled | Matrix breaks or labels lift |
| Tamper Effect | Clear and repeatable | Patchy or inconsistent |
| Printing | Stable ink/ribbon compatibility | Rub-off, smearing or weak anchorage |
| Batch Consistency | Repeatable qualification | Significant roll-to-roll variation |
| Production Risk | Lower | Higher |
This is why purchase price per square meter should not be the only evaluation criterion.
For converters, a cheaper material that produces additional waste, downtime, rework and complaints may ultimately be more expensive.
What Label Converters Should Ask Before Ordering
Before approving a security label material for bulk production, buyers should be able to answer several practical questions:
- What is the final application substrate?
- Which adhesive system is being supplied?
- What dwell time is required before final evaluation?
- What release liner is used?
- Is release behavior suitable for the intended converting process?
- Has the construction been tested for die cutting and matrix stripping?
- Which printing processes and inks or ribbons need to be qualified?
- What tamper response is required?
- Full transfer, partial transfer or non-transfer?
- What temperature and storage conditions will the material experience?
- Can sample or slit rolls be supplied for converter trials?
- How is batch consistency controlled?
These questions help move material selection away from:
“Can you send your cheapest VOID film?”
toward the more useful question:
“Which construction is suitable for our substrate, printing process, converting equipment and final security requirement?”
That is the question that normally leads to a more reliable production result.
For custom security label material projects, buyers should also confirm available roll formats, material thickness options, adhesive customization, security message design and OEM development capability before final approval.
Recommended Pre-Production Qualification Workflow
For most converter projects, a practical qualification sequence is:
1. Confirm the construction
Facestock, adhesive, liner, transfer type, coating and roll configuration.
2. Test adhesion on the intended substrate
Include representative dwell time.
3. Check release behavior
Confirm that the laminate behaves consistently during separation.
4. Run printing trials
Use the actual ink, ribbon or printing platform where possible.
5. Check print durability
Evaluate adhesion, rub, scratch and code readability.
6. Run die cutting and matrix stripping
Use representative label size, spacing and production conditions.
7. Apply converted labels to the real substrate
Do not approve the material only as an unconverted roll.
8. Allow the agreed dwell period
9. Perform the final tamper test
Confirm the specified security response.
10. Record the results before bulk approval
This sequence is especially useful because one operation can affect the next.
A printable material may look good before converting but fail after die cutting. A VOID material may show a good security response as raw material but behave differently after printing or processing.
Final approval should therefore consider the complete workflow.
Best Practices for More Reliable Test Results
A good test program does not need to be unnecessarily complicated, but it should be repeatable.
Use the real substrate whenever possible.
Control important variables such as:
- specimen size;
- dwell time;
- application pressure;
- temperature;
- humidity where relevant;
- test direction;
- converting conditions.
Do not approve a bulk order from one visually good sample alone.
Where project risk justifies it, compare multiple specimens, roll positions or batches.
Most importantly, record both:
quantitative results
such as force values or barcode verification data;
and
qualitative observations
such as edge lifting, fracture behavior, matrix stability and tamper-message clarity.
The combination provides a more realistic picture of production suitability.
Quality Control Is More Than an Inspection Step
For a label converter, proper material qualification can become a competitive advantage.
It can support:
- faster production setup;
- lower waste;
- fewer customer complaints;
- more predictable press performance;
- more confident material recommendations;
- stronger long-term supplier relationships.
For a material manufacturer, the same principle applies.
The role of the supplier should not end when a roll leaves the factory.
Technical discussions about the application substrate, adhesive, printing process, roll format and final security requirement can help prevent problems before they appear on the converting line.
That is especially important for specialty security materials, where performance depends on the interaction of multiple functional layers.
Conclusion
Security label materials may look simple, but reliable performance depends on the complete material system.
For label converters and technical buyers, security label material quality control should evaluate five essential areas:
- peel adhesion;
- release force;
- die cutting and matrix stripping;
- final tamper-evident performance;
- printing, barcode and rub resistance.
The purpose is not simply to create more laboratory data.
The purpose is to answer a practical question:
Will this material print, convert, apply and perform consistently in the customer’s real production and end-use conditions?
A reliable material should do more than meet a basic specification.
It should provide a workable converting window, stable adhesive and release behavior, clear tamper evidence, compatible printing performance and acceptable batch-to-batch consistency.
Testing these factors before scale-up helps converters reduce risk and gives buyers a stronger basis for comparing suppliers.
Need to Qualify a Security Label Material Before Bulk Production?
Send us your application substrate, printing method, label size, operating conditions and required tamper effect. Hanksec can recommend a suitable security label material construction and provide sample rolls for converting, printing and application trials.
REQUEST MATERIAL SAMPLE & TESTING
FAQ
1. Why is quality control important for security label materials?
Security label materials perform a functional role. In addition to appearance, they must provide suitable adhesion, release behavior, converting performance, print durability and the required tamper-evident response.
2. What tests should label converters perform before bulk production?
A practical qualification program can include peel adhesion, release force, printing and rub tests, die cutting, matrix stripping and final tamper-evident testing on the actual application substrate.
3. Why is release force important for label converters?
Release behavior affects dispensing, matrix stripping, web handling and converting stability. Excessively high, excessively low or inconsistent release can increase production difficulty and waste.
4. How should VOID label materials be tested?
The converted label should be applied to the intended substrate, allowed an appropriate dwell period and then removed to evaluate security-message clarity, transfer behavior, residue and the ability to detect attempted tampering.
5. Can a security label material work on one substrate but fail on another?
Yes. Adhesive bonding and tamper behavior can change significantly between glass, metal, coated paperboard, PET, ABS, PP, PE and other surfaces. Final qualification should therefore use the real application substrate whenever possible.
6. Is the strongest adhesive always the best choice?
No. Security labels depend on controlled interaction between adhesive strength, substrate bonding and the tamper-evident mechanism. The correct adhesive is the one that produces the required security response under the intended application conditions.
