Why is weight considered the controlling factor in certain classifications?

Weight is considered the controlling factor in certain classifications primarily because it is essential for comparison purposes in specific categories, such as textile alloys and base metals. In these classifications, weight can significantly influence the materials' properties, usage, and regulatory requirements. For example, when dealing with textiles, the weight of the fabric can determine its strength, durability, and suitability for different applications. In the case of base metals, weight can indicate density and has implications for material selection in manufacturing processes.

Understanding the role of weight in these categories helps customs brokers accurately classify goods, ensuring compliance with regulations and avoiding potential duties or tariffs that could arise from misclassification. This classification system simplifies the process of comparing various products within a category, thereby enhancing efficiency in logistics and trade.