Tamper Evident Seal
Does a tamper-evident seal prevent tampering?
No. Its primary function is detection, not prevention. A seal provides visible evidence that a container or asset was opened or disturbed after the fact, but it does not physically block determined access.
What makes a seal useful in a manufacturing inventory system?
Usefulness comes from unique serial numbers, visible break indicators, and documented handoff records. These features allow a site to verify continuity across receiving, storage, production issue, and shipment, and to flag mismatches or duplicates for containment.
What should happen if a seal is broken or mismatched?
The shipment or container should be placed on hold, the discrepancy logged, inventory status updated, and an investigation started to determine whether contamination, theft, or misrouting occurred.
A tamper-evident seal is a device or material applied to containers, packages, trailers, valves, or equipment that changes visibly and irreversibly when opened or accessed. It does not prevent access but provides after-the-fact evidence of tampering, enabling detection of unauthorized opening during transit, storage, or handling in a supply chain.
In manufacturing and warehousing, tamper-evident seals function as chain-of-custody checkpoints. Seals are applied to inbound raw-material totes, outbound pallets, bulk tanks, truck doors, cross-dock trailers, and regulated storage units. The receiving clerk verifies that the seal is intact and that its serial number matches the advance ship notice or bill of lading before accepting the load. That number is then recorded in WMS, TMS, or ERP records and linked to lot genealogy or shipment data. At put-away, line feed, and final dispatch, the same seal is checked again; any mismatch, break, or duplicate triggers a hold, incident report, and inventory quarantine. On the shop floor, this matters most for high-risk consumables, chemicals, additives, and returnable containers where unauthorized opening could cause contamination, pilferage, or mix-ups. Some sites integrate QR codes, barcodes, or RFID tags so each scanning event creates a digital audit trail from issue to receipt.
Seal number not reconciled at receiving: An intact-looking seal can hide a swapped load when receiving only confirms a seal is present and never matches its serial to the advance ship notice, breaking traceability and letting unauthorized inventory enter.
Seal applied to the wrong control point: A seal on an outer carton gives false confidence when the product can be reached through a different opening, such as a valve. Contents can be removed while the visible seal stays intact.
Poor lot-to-seal linkage: When seal IDs are not captured in ERP/WMS/TMS or tied to lots, quantities, and handoff timestamps, a broken seal forces a broad quarantine because the site cannot prove what was compromised. This stalls receiving and line release.