Technical Articles
What Is a Tamper-Evident Void Label?
Technical explanation of tamper-evident void labels for packaging buyers: void message transfer, face stock, adhesive, application surfaces, and RFQ fields for security labeling.
Quick answer
A tamper-evident void label is designed so that when peeled, it leaves a “VOID” or similar pattern on the surface or destroys the face, showing the pack was opened. Buyers use them on cartons, devices, and seals where resealing without evidence must be difficult.
How it works
Special face/adhesive constructions fracture or transfer a message on removal. Performance depends on surface energy, dwell time, and temperature—not only on the printed word “security.”
What to specify
Void pattern type, face stock, adhesive grade, size, print colors, and the intended substrate (carton varnish, PET, glass, powder-coated metal). Ask for application and peel test conditions.
Validate on real surfaces
Test after the label dwells on production finishes, including soft-touch and heavy varnish. Some coatings reduce transfer and weaken evidence.
Plan operations
Define who applies labels, inspection criteria, and whether residue is acceptable on reusable assets. Residue rules differ for retail cartons versus returnable totes.
RFQ
Substrate; void type; size; adhesive
Dwell/peel test method; temperature range
Print/branding; residue expectation
Sample rolls; monthly volume
Related PackTrades Knowledge
How to Spec Security Labels and Tamper-Evident Tags, How to Spec Barcode Grade on Export Packaging Labels, Self-Adhesive Labels from China: Buying Guide, How to Verify Label Printing Suppliers in China.
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