How does the brand tag test for 24-hour corrosion? Non-toxic-A

“Brand tag” usually refers to a brand identity label, which is tested to see if it passes a 24-hour corrosion test and is non-toxic, using a combination of material science, chemical analysis and environmental testing methods. The following are specific ideas for testing:

First. 24-hour corrosion test
Test purpose
To simulate the resistance of the label in a humid, corrosive environment (such as salt spray, acid and alkali solutions), and assess whether the material corrodes, discolors, deforms or degrades in performance within 24 hours.
Test Methods
Salt spray test: Place the label in a salt spray test chamber to simulate an ocean or high humidity environment, spray a 5% sodium chloride solution and observe the change in appearance after 24 hours.
Acid and alkali immersion test: Immerse the label in an acidic solution at pH=2 or an alkaline solution at pH=12 for 24 hours to detect the chemical resistance of the material.
Humidity and heat cycle test: Combine high temperature and high humidity (e.g., 40°C, 90% RH) with low temperature and low humidity environment, cycle for 24 hours to evaluate the label’s weather resistance.
Judgment Criteria
No corrosion spots, rust or material dissolution on the label surface.
Text and graphics are clearly legible without fading or blurring.
Adhesive without peeling or failure.

Second.non-toxicity test
Test purpose
To ensure that the labeling materials and printing inks of harmful substances (such as heavy metals, phthalates, polycyclic aromatic hydrocarbons, etc.) do not exceed the standard, in line with safety standards.
Test Method
Chemical extraction method: Soak the label in simulated body fluids (e.g. artificial saliva, sweat) for 24 hours to extract the harmful substances and test the content by instrumental analysis (e.g. ICP-MS, GC-MS).
Direct detection method: Using X-ray fluorescence spectrometer (XRF) or Raman spectrometer, the chemical composition on the surface of the label is directly analyzed.
Biotoxicity test: The extract is used in cytotoxicity test (e.g. MTT method) or zebrafish embryo toxicity test to evaluate the biological safety.
Judgment Criteria
Heavy metals (e.g. lead, cadmium, mercury) content below regulatory limits (e.g. EU REACH regulation, China GB 4806 series standards).
Hazardous substances such as phthalates and PAHs are not detected or below the limits.
Biotoxicity test results meet the safety level (e.g. cell viability >70%).