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Could you elaborate on the durability and longevity of natural rubber? I'm particularly interested in understanding the factors that influence its lifespan. Are there specific conditions, such as temperature or humidity, that significantly impact its durability? Additionally, are there any maintenance measures that can be taken to extend the life of natural rubber products? Finally, what are the common signs of wear and tear in natural rubber, and how can we identify when it's nearing the end of its useful life? Your insights would be greatly appreciated in addressing these queries.