Section R. 408.14931 - Safe operating temperatures; sling useRule 4931.
(1) A wire rope sling shall not be used with loads in excess of the rated capacities. A sling shall be used only in accordance with the manufacturers recommendations.(2) A fiber core wire rope sling of any grade shall be permanently removed from service if it is exposed to a temperature in excess of 200 degrees Fahrenheit.(3) When a nonfiber core wire rope sling of any grade is used at a temperature above 400 degrees Fahrenheit or below minus 60 degrees Fahrenheit, recommendations of the sling manufacturer regarding use at that temperature shall be followed.(4) Employers shall use only wire-rope slings that have permanently affixed and legible identification markings as prescribed by the manufacturer and that indicate the recommended safe working load for the type of hitch used, the angle upon which it is based, and the number of legs if more than 1.Mich. Admin. Code R. 408.14931