Ceramic fiber products generally exhibit excellent performance in high-humidity environments. They have a low thermal conductivity, which helps maintain insulation properties even in the presence of moisture. Their resistance to water absorption means they don't degrade easily when exposed to water or high humidity. Additionally, ceramic fibers are chemically stable and do not react with water, which further enhances their durability. However, it's important to note that prolonged exposure to high humidity can affect the mechanical strength of some ceramic fiber products, so regular inspection and maintenance are recommended to ensure optimal performance.