Product description of Level 3 Security Bag Seal :
The Level 3 security bag seal is designed with high - end anti - counterfeiting technology. Its base is made of either PET or PO anti - counterfeiting materials. After removing the release paper, a membrane is attached to create a secure seal, ideal for security and logistics bags as well as anti - disassembly applications.
This seal has a temperature - sensitive surface. When exposed to temperatures above 60°C or if someone attempts to open the bag with high heat, the "VOID" mark on it swiftly changes from white to red, clearly showing signs of tampering. Additionally, when the temperature drops to 0°C or below, or during a low - temperature opening attempt, the anti - counterfeiting markings fade, providing dual - temperature protection.