Security labels for the pharmaceutical, electronics, and cosmetics industries: seals, VOID materials, and tamper-evident solutions

In many industries, packaging alone is not enough to give customers a sense of security. What also matters is the assurance that the product has not been previously opened, tampered with, damaged, or used for purposes other than intended. This is particularly true for the pharmaceutical, electronics, and cosmetics industries—sectors where trust in the brand is directly linked to quality, authenticity, and control over access to the contents.

This is where security seals and specialized tamper-evident self-adhesive labels play a major role. Their purpose is not always to physically prevent the package from being opened. Often, it is more important that any attempt at tampering be visible and impossible to conceal. A well-chosen security label thus serves as a simple message: the product is intact, genuine, and ready for safe use.

What are security labels, and when should they be used?

Security labels are special self-adhesive labels designed to protect a product, package, or shipment from unauthorized opening. They can take the form of a seal applied to the closure of a cardboard box, a lid, a cap, a box flap, a device housing, or bulk packaging. Depending on the application, they may delaminate when peeled off, leave a “VOID” mark, shatter into small pieces, or reveal a tamper-evident mark in another way.

Such solutions are worth using wherever first-opening control and protection against product substitution are important. In the pharmaceutical industry, they can enhance the security of packaging for medications, supplements, and medical devices. In electronics, they help secure devices, accessories, components, and warranty packaging. In cosmetics, they boost consumer confidence, particularly for premium products, dermocosmetics, active formulations, testers, gift sets, and online sales.

Security seals as a visible indication of tampering

Security seals have one primary function: to show whether the packaging has been opened or if an attempt has been made to open it. A well-designed seal should be easy to spot, unambiguous in its message, and difficult to remove without leaving a trace. This ensures that the recipient does not have to guess whether the packaging has been tampered with. They can tell immediately by the condition of the label.

In practice, seals can secure the closures of cartons, electronics boxes, cosmetic packaging, vials, jars, tubes, bottles, shipping containers, and retail kits. Their advantage lies in their high design flexibility. We can tailor the format, shape, material, adhesive, color, print, and level of security to a specific product. A seal can be discreet and technical or clearly visible if it is also intended to instill a sense of security in the end customer.

VOID Materials: How Does a Label That Leaves a Mark When Peeled Off Work?

One of the most commonly used solutions are labels made from VOID materials. When an attempt is made to peel it off, such a label leaves a distinctive mark on the surface, usually in the form of text, a pattern, or an adhesive layer. At the same time, the label itself also undergoes a visible change, making it practically impossible to reapply it in its original condition.

VOID materials work well in situations where we want to quickly detect tampering with a product or packaging. We can use them on electronics boxes, medication packaging, documentation, replacement parts, service equipment, premium cosmetics, and high-value shipments. However, it is important to remember that not every VOID material behaves the same on every surface. It will perform differently on coated cardboard than on plastic, glass, metal, or a matte surface. Therefore, it is always advisable to conduct an application test before implementation.

Tamper-evident solutions in the pharmaceutical, electronics, and cosmetics industries

Tamper-evident solutions are designed to reveal any attempt at tampering. In the pharmaceutical industry, they are particularly important because users must be certain that the product has not been opened, contaminated, or substituted. A security label can seal a carton, secure a lid, join two packaging components, or serve as an additional identification element. In this industry, it is not only the effectiveness of the security measure that matters, but also production consistency, print legibility, and the solution’s compliance with packaging requirements.

In electronics, security seals often serve a warranty and service function. They can indicate whether the device’s casing has been opened, whether a component has been removed, or whether the factory packaging was tampered with prior to sale. In cosmetics, however, the combination of security and aesthetics is key. The seal must not look haphazard or detract from the product’s presentation. For premium products or dermocosmetics, it should be tailored to the packaging so that it builds trust rather than appearing as a technical add-on tacked on at the end of the process.

How do you choose the right adhesive, material, and perforations for the packaging surface?

The effectiveness of a security label depends not only on the material itself, but also on the surface to which it will be applied. Different adhesives are needed for cardboard, glass, plastic, film, metal, or lacquered packaging. The surface texture, surface energy, bend radius, application temperature, and storage conditions also matter. Even the best security seal may fail to perform its function if applied to a too-difficult substrate without prior testing.

In many cases, special cuts, perforations, or crumbly materials are also used. Thanks to these, the label breaks when an attempt is made to peel it off or separates in a controlled manner. This is a good solution when we want the removal of the seal to be immediately visible. With small packages, however, caution is needed: adhesive that is too strong, an ill-chosen format, or an inappropriate application location can make it difficult for the consumer to open the product normally. Therefore, when designing security seals, we should always consider both protection and ease of use.

Printing, numbering, and additional elements: when does a security label become a data carrier?

Security labels can serve not only a protective function but also an informational one. We can print a logo, a warning, the message “do not use if the seal is broken,” a serial number, a barcode, a QR code, a batch number, or a unique identifier on them. This makes the seal part of the product control system, rather than just an element that seals the packaging.

This is particularly useful in industries where traceability and distribution control are critical. Numbered self-adhesive labels can support complaint handling, service inspections, batch management, authenticity verification, or product flow tracking. For premium brands, additional graphic elements can also enhance the product’s credibility. However, it is important to remember that the smaller the label, the more critical legibility becomes. The code, number, or message must be visible after application and not hidden in a fold, under a flap, or in a location prone to abrasion.

Common Mistakes in Designing Security Seals

One of the most common mistakes is choosing a seal based solely on its appearance. However, a security seal operates under specific conditions: on a specific surface, at a specific temperature, and under specific opening and transport conditions. If we do not take these factors into account, the seal may peel off on its own, tear too easily, leave no trace, or, conversely, damage the packaging more than we intended.

The second mistake is skipping testing. Before producing a larger batch, it’s worth checking how the label behaves after application, after a few hours, after transport, in cold conditions, at elevated temperatures, or when exposed to moisture. The placement of the label is also important. The seal should secure the actual opening point, but it must not obscure mandatory information, codes, expiration dates, or elements essential to the user. A well-executed test helps avoid costly corrections and ensures that the solution will work in practice, not just on paper.

A good security seal protects the product and builds trust in the brand

Security seals and specialized self-adhesive labels are a crucial element of product protection in industries where authenticity, safety, and first-opening verification are paramount. They can detect tampering attempts, support the claims process, protect the product during distribution, and simultaneously build trust with the end consumer. However, their effectiveness depends on the proper selection of material, adhesive, format, print, and application location.

If you plan to implement security labels for pharmaceuticals, electronics, or cosmetics, it is worth approaching the project from a technical perspective, not just a graphic one. We analyze the packaging surface, the opening method, storage conditions, the risk of tampering, and the expected effect after an attempt to peel it off. Only on this basis can we select a tamper-evident solution that will truly fulfill its function. A well-designed seal is not just about the sticker itself, but about sending a clear signal to the customer: the product is genuine, safe, and unopened.

back