YS/T 91-2020 in English

This standard outlines the specifications for aluminum and aluminum alloy materials used in the production of bottle caps. It covers the requirements for plates, strips, and foils, including dimensional tolerances, mechanical properties, and surface quality. The standard also provides guidelines for testing methods and inspection procedures to ensure product consistency. Additionally, it defines the classification of materials based on their composition and intended application. The document serves as a reference for manufacturers, suppliers, and quality control personnel to maintain uniformity in material specifications across the industry.