Which of the following materials are commonly used for making synthetic slings?

Polyester and nylon are commonly used for making synthetic slings due to their favorable properties, which include high tensile strength, durability, and resistance to abrasion and UV degradation. These materials are lightweight and can be manufactured in various widths and lengths, providing versatility for different rigging applications.

Polyester, in particular, is resistant to moisture and chemicals, making it suitable for outdoor use or environments where spills or exposure to chemicals might occur. Nylon, on the other hand, has excellent elasticity, providing some stretch under load, which can be beneficial in absorbing shock loads during lifting operations.

The combination of these characteristics enables synthetic slings made from polyester and nylon to meet the safety and performance standards required in rigging tasks, making them a preferred choice over other materials.