The manufacture of zinc alloy labels must comply with relevant national and industry standards, such as requirements for material composition, dimensional accuracy, and surface quality. Furthermore, to ensure the quality and durability of the labels, strict quality control and testing are required during the manufacturing process.
The industry standard for zinc alloy labels is based on GB/T 13818-2024 "Die-cast Zinc Alloys," which was published and implemented on April 25, 2024, fully replacing the old version GB/T 13818-2009 and significantly improving material purity, performance stability, and manufacturing standardization.
Stricter Limits on Impurity Elements: Limits on harmful impurities such as Fe (iron), Pb (lead), Cd (cadmium), and Sn (tin) have been further tightened, effectively suppressing intergranular corrosion and material aging, and improving the long-term durability of labels in humid and salt spray environments.
New Alloy Grades: New grades such as YZZnAl4C and YZZnAl3Cu5, along with their chemical composition requirements, have been added, providing more material options for high-precision, complex-structure label die-casting.
Explicit Surface Quality Requirements: For the first time, the standard stipulates that the surface quality of die-cast zinc alloys must be inspected visually, promoting unified control over the appearance indicators of finished labels, such as text clarity and pattern integrity.
More Comprehensive Inspection Rules: Chemical composition is required to be inspected for each batch, appearance quality for each piece, and mechanical properties are sampled and tested batch by batch, ensuring the consistency and traceability of mass-produced labels.