It is rubberized like Timing belt with variation of delivering power to air conditioning, power steering, cooling system, alternator and more vehicle parts. The Difference of Serpentine Belt VS Timing belt makes it very clear to readers. This belt is not only used in Cars, but also in other machines as well.
In Car, Generally; Serpentine belts are not repaired or maintained and works for 150,000 miles. They do not work forever because everything has its own life. Mechanic & Owner must have regular inspection to belt and do on the intervals.
We have had in detail.
Why Serpentine belt makes noise in Car?
Serpentine belt squeals when you do not inspect your fan. The multiple causes can be both to be worried and to be relaxed. Mostly drivers observes squealing when they drive on rain. Serpentine belt makes noise if there is some water on it.
Like Signs of Timing Belt, it also gives signs before tearing. Ribs do not correctly face to pulley. Mostly, belt work fine with little missing drives. But you must replace them instantly to avoid future damages of linked parts. Damaged belt from one side is sign of misalignment.
Cranks are also signs of belt failure. Few cranks can be more than or near to half. This is clearer sign to replace serpentine belt.