Which factor is least likely to affect a belt's lifespan?

The lifespan of a belt is influenced by several factors related to its operating conditions and physical characteristics. Among these, belt color is the least likely to have a significant impact.

Belt color does not affect the material properties or structural integrity of the belt itself. It's primarily a cosmetic choice, usually made for identification or branding purposes. In contrast, operating temperature is crucial because extreme heat or cold can degrade materials and affect their flexibility and strength. Belt tension is equally significant, as too much or too little tension can lead to abnormal wear or slipping, compromising performance and lifespan. Similarly, the type of conveyed material can play a critical role; abrasive materials can wear down the belt much faster than non-abrasive ones.

Therefore, while belt color may have aesthetic value, it does not influence performance or durability in the same way that the other options do.