Which type of sling requires the employer to maintain certificates of proof test?

The requirement for employers to maintain certificates of proof test for slings is primarily associated with alloy steel chain slings. This is because these slings are subjected to strict safety regulations due to their extensive use in heavy lifting applications. The proof testing process involves applying a specific load to the sling to ensure it can handle the expected working load safely. Maintaining proof test certificates ensures compliance with safety standards and helps to prevent accidents caused by equipment failure.

In comparison, while other types of slings like wire rope, nylon web, and metal mesh slings have their own safety standards and requirements, they may not necessarily demand certified proof tests in the same way. For example, wire rope slings must be inspected regularly, and while they are regulated, they do not have the same requirement for proof testing documentation as alloy steel chain slings do. This distinction underscores the importance of rigorous testing and documentation in ensuring the safety and reliability of the lifting equipment used in the workplace.