Tamper evident bag tape
Tamper Evident Bag Tape Levels
Six layered levels of bag tape security, so you can match the construction to the risk instead of over specifying or under protecting.
Each level includes everything in the level below it, from a clear void message through to thermochromic ink, security cuts, hidden UV print and water fugitive ink. All levels are engineered for compatibility with a wide range of bag film types.
Tamper behaviour
How the levels build on each other
Every level leaves a clear, irreversible message or pattern when the tape is removed, so any tampering attempt is immediately visible. Higher levels add detection of heat, physical removal, covert identifiers and liquids.
01
Overt evidence
A void message on the bag surface that cannot be resealed or hidden.
02
Detection layers
Thermochromic ink and security cuts respond to heat and physical removal attempts.
03
Covert authentication
Hidden UV print and water fugitive ink for verification and liquid detection.
▶VideoTamper evident bag tape
Shows tamper evident bag tape being applied to a sealed bag and the permanent message left behind once the seal is opened.
Watch on YouTube ↗The levels
Bag tape security levels 2 to 6
Level 2 — Void and Void Cold
The base level of security bag tape. On removal the tape reveals a clear VOID message on the bag surface, leaving no doubt of tampering. Void Cold means the message also appears at cold temperatures, for a wider range of protection.
Level 3 — adds Thermochromic
Adds a thermochromic layer that changes colour when exposed to heat, revealing a hidden message or pattern alongside the VOID message. This detects attempts to bypass the adhesive using heat, such as with a hairdryer.
Level 4 — adds Security Cuts
Integrates security cuts into the tape. These pre scored lines weaken the tape at specific points, so it tears irregularly if someone attempts to remove it without breaking the seal. Combined with the thermochromic layer and the VOID message this gives a strong deterrent and clear evidence.
Level 5 — adds Hidden UV Print
Adds a hidden UV print, invisible to the naked eye and visible under UV light. The print can be customised with logos, sequential numbers or other unique identifiers for covert security and authentication.
Level 6 — adds Water Fugitive ink
The most comprehensive protection available from Tamper Technologies. All the features of Level 5 plus a water fugitive ink layer that dissolves on contact with water, clearly indicating tampering attempts involving water or other liquids.
Comparison
Features by level
| Level 2 | Void and Void Cold message. |
|---|---|
| Level 3 | Void, Void Cold and thermochromic ink. |
| Level 4 | Void, Void Cold, thermochromic ink and security cuts. |
| Level 5 | Void, Void Cold, thermochromic ink, security cuts and hidden UV print. |
| Level 6 | Void, Void Cold, thermochromic ink, security cuts, hidden UV print and water fugitive ink. |
Not sure which level you need? Tell us the bag, the contents and the risk and we will recommend the level.
Applications
Choosing a level by application
Cash and coin handling
Heavy coin bags and cash in transit, where strength and thermochromic detection matter.
Evidence integrity
Chain of custody handling, where security cuts and a custom void message support the record.
Duty free retail
Sealed purchases carried through airports and verified at security checks.
Confidential document transport
Sealed bags moving between sites, with numbering for traceability.
Retail and logistics
High volume sealing where a visible deterrent and loss prevention are the priority.
Application and integration
Specifying the tape
All film types
Engineered for compatibility with all bag film types, with strong adhesion and clear tamper messaging.
Formats
Widths, roll lengths and cores specified to the bag and the sealing process.
Customisation
Custom void messages, UV print, numbering, barcodes and branding across the levels.
Next step
Choose the right level
Need samples or a quotation?
Tell us the bag, the contents and the volume and we will send samples and a quotation.
Not sure what will work on your pack?
Put it through the Security Lab. Send us the bag and the problem and our technical team will specify the level with you.
Contact Us
Get in touch today
Tamper Technologies Ltd,
The Oaks, Moor Farm Road West,
Airfield Industrial Estate,
Ashbourne, Derbyshire,
DE6 1HD, United Kingdom.
Phone: +44 (0) 1335 300335
WhatsApp: +44 (0) 7528 477703
Email: harriet@tampertech.net