Which of the following materials is considered improper for repairs on chains and hooks?

Rope is considered improper for repairs on chains and hooks due to its lack of strength and durability compared to other materials. Chains and hooks are typically subjected to significant loads and stresses, requiring materials that can withstand heavy weights and provide reliable performance. Rope, while it may have some tensile strength, is not designed to handle the high forces involved in applications where chains and hooks are used.

In contrast, materials such as steel, plastic, and fiberglass may be used in various contexts for repairs, with steel being particularly strong and suitable for maintaining the integrity of load-bearing components. Using inappropriate materials like rope can compromise safety, as it may break or fail under pressure, leading to accidents or equipment failures. Therefore, for repairs on chains and hooks, it is always essential to use materials specifically designed to meet the load requirements and safety standards.