Ceramic fiber insulation can be used in outdoor applications, including greenhouses and solar panels, but with considerations. It provides excellent thermal insulation and resistance to high temperatures. However, it's crucial to protect it from moisture and direct exposure to the elements, as prolonged exposure can degrade its performance. For outdoor use, it's often encapsulated or coated to enhance durability and weather resistance. Always ensure that the specific product is designed for outdoor use and follow manufacturer guidelines for installation and maintenance.