Product description of Level 4 Security Bag Seal:
The anti-counterfeiting function of the Level 4 security bag seal is that it is bonded with the membrane after the release paper, forming a seal with anti-counterfeiting function. The substrate is PET or PO anti-counterfeiting material, which is usually used in security bags, logistics bags, anti-disassembly and so on.The word "VOID" in the blank area will turn red when the bag is exposed to a high temperature of more than 60 degrees, or when the bag is attempted to be opened by the high temperature. The surface of the seal is the temperature indicator layer. Once the temperature is met, the temperature sensitive layer will change quickly, usually white to red, and the temperature to red information is rapid, clear, conspicuous and intuitive.When the bag is exposed to a low temperature of 0 degrees or less, or when you tries to open through a low temperature, the anti-counterfeiting characters will fade.if the security bag seal meet the water or solvent, the tamper evident word will be disappeared.