Testing the durability of chemical labels essentially involves simulating the physical, chemical, and environmental stresses they may encounter during storage, transportation, and use. A series of standardized tests are used to verify whether the label can maintain clear, unblemished, and unfaded information throughout its entire lifespan. The following are specific, actionable testing methods and standards:
I. Chemical Resistance Test: Verifying Resistance to Solvents and Corrosion
This is one of the most critical tests, ensuring the label remains intact after contact with chemicals.
Test Method: Expose label samples to common chemicals (such as alcohol, acetone, dilute acids, dilute alkalis, machine oil, etc.) using either an immersion method or a wiping method.
Immersion time is typically 24 hours or longer, and the number of wiping cycles is set according to standards (e.g., 50 back-and-forth rubbing cycles).
Evaluation Indicators: Whether discoloration, swelling, blistering, blurred text, ink flaking, or loss of tack occurs.
Reference Standards:
ASTM D1308 (Effect of a Single Drop of Liquid on a Coating)
ISO 1518 (Determination of Liquid Resistance in Paints and Varnishes)
