I live in a rental property and the bathroom sink has hairline cracks in it. I'm not sure if it is acrylic or corian. It also has a few small chips. Does this indicate it's age and overall wear? Do these small cracks contribute to an unhealthy and unsanitary sink environment?

Have never seen hair line cracks in corian. Acrylic does get hair line cracks with age. If you use a good cleaner on sink, should be no health problem.

Chuck