Tamper evident bag tape
Evidence Integrity Bag Tape
Permanent tamper evident bag tape for evidence bags, giving visible proof if a sealed bag has been opened or interfered with.
Applied once, the tape leaves visible marks or void patterns that cannot be resealed, which supports a clear and documented chain of custody through handling and storage.
Tamper behaviour
What happens if the seal is breached
Security cuts, thermochromic ink and a custom hidden void message make the tape impossible to remove without leaving clear signs of interference.
01
Bag sealed
The tape is applied across the evidence bag, sealing it at the point of collection.
02
Interference attempted
Security cuts tear irregularly, and thermochromic ink reacts if heat is used on the adhesive.
03
Evidence revealed
A custom void message is left behind and the seal cannot be resealed or replaced.
▶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 ↗Why this construction
Features that support integrity
Security cuts
Pre scored lines make the tape resistant to clean removal and leave evident signs of any attempt.
Thermochromic ink
Changes colour when exposed to heat, giving a visual indicator of an attempt to release the adhesive.
Custom void message
A unique mark left on removal, which discourages unauthorised access.
Cannot be resealed
Once removed, the tape cannot be repositioned without visible evidence.
Supports chain of custody
Clear visual indicators support transparency and accountability in handling records.
Traceability options
UV features and numbering can be added for identification and authentication.
Construction and specification
Specification and options
Construction
| Type | Permanent tamper evident bag tape. |
|---|---|
| Security features | Security cuts, thermochromic ink and custom hidden void messaging. |
| Behaviour on removal | Visible marks or void patterns are left behind and cannot be resealed. |
| Films | Compatible with a wide range of bag film types. |
| Formats | Widths and roll lengths specified to suit the bag and the sealing process. |
Options
Security levels
Additional layered features are set out in the bag tape levels, from a void message through to UV and water fugitive features.
Specification routes
Numbering and record-keeping specifications
Evidence integrity depends on the record as much as the seal: who sealed it, when, and which number. These are the specifications that support that chain.
Factory-applied sequential numbering
Pre-printed number ranges / unique number per bag / no line-side printing
Dual number tab for two-part records
Matching number on seal and peel-off tab / tab is retained with the paperwork
Non-residue label with dual number tab — 240mm x 40mm
Blue non-residue / 240mm x 40mm / lifts clean from the bag / bag-mouth format
A tamper-evident seal shows that a bag was opened. It does not record who opened it — that comes from the number and the log around it. Send us the bag and your handover process and we will specify both together.
Applications
Where evidence integrity bag tape is used
Evidence handling
Sealing evidence bags so any interference in handling or storage is visible.
Government and secure services
Controlled movements where access to a sealed bag must be evidenced.
Clinical and laboratory samples
Sample bags where integrity from collection to analysis matters.
Secure document transport
Confidential documents moved between sites in sealed bags.
Application and integration
Sealing at the point of collection
Hand application
Applied by hand at the point the bag is sealed, with no special equipment.
Recording the seal
Numbered or coded seals can be recorded against the item at each handover.
Bag compatibility
Specified to the bag film so adhesion and void behaviour are reliable.
Next step
Specify your evidence bag seal
Need samples or a quotation?
Tell us the bag, the film type 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 seal with you.