Ceramic fiber products are generally resistant to moisture, making them suitable for use in damp environments. They have a low thermal conductivity and can withstand high temperatures, which is why they are often used as insulation in various industrial applications. However, the performance of ceramic fiber products can be affected by prolonged exposure to water or high humidity, which may lead to a reduction in their insulating properties. It's important to ensure that the ceramic fiber products are properly protected or treated to maintain their integrity in damp conditions.