Yes, paint thinner can damage PVC (polyvinyl chloride) material. PVC is a type of plastic that's commonly used for pipes, fittings, and other products. Paint thinner has strong chemicals that can make PVC become weaker, crack, or change its color.  If you're using paint thinner around PVC, it's important to be careful to avoid splashes or contact. It's best to keep paint thinner away from PVC to prevent any damage. If you need to clean or remove paint from PVC, consider using methods and products that are safe for plastic materials.