Temperature-sensitive Security Bag
This bag remains intact and undamaged prior to opening; however, once opened, the hidden text "OPEN VOID" is permanently revealed on the bag's surface. Simultaneously, the seal itself is visibly compromised and displays the "OPEN VOID" inscription, rendering the bag suitable for single-use only. If the seal is exposed to temperatures exceeding 65°C, a white indicator strip within the bag will immediately turn pink—a color change that is irreversible. Furthermore, should the bag be submerged in water, the word "WATER" located on the seal at the bag's opening will automatically disappear. The bags can be fully customized to meet client specifications regarding dimensions, printing details, and other requirements; additionally, each bag can be marked with a unique code to facilitate product traceability.
Technical Specification
| Material | LDPE |
| Size | Custom |
| Color | White, Clear or Custom |
| Customization | Logo、Serial number、Barcode、Written Area |
| Layer | Single-layer, Three-layer, Multi-layer (optional) |
| Security Message | OPEN VOID, VOID or Custom、Heat-induced color change |
| Feature | ① the character "water" will disappear if met water ② the white ink will turn red when heated up to 65℃ ③ Hidden text "OPEN VOID" will appear once removed |
| Application Scenarios | ① Finance/Banking: Cash transfer bags, coin bags, check bags, ATM cassette bags. ② Logistics/Courier: Security bags for shipping high-value small items (jewelry, phones, samples). ③ Government/Judicial: Evidence bags, ballot bags, confidential document bags. ④ Retail/E-commerce: Return seal bags for returned goods, high-value accessory packaging bags. ⑤ Medical/Laboratory: Non-sterile sample bags, medical record bags, pharmaceutical transit bags. |
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