Yes, there are regulations on the use of ceramic fibers in buildings and automobiles. These regulations vary by country and are designed to protect human health and the environment. In the construction industry, ceramic fibers are often used for insulation and fireproofing, and they must meet standards to limit the release of fibers that could be harmful when inhaled. In the automotive industry, ceramic fibers are used in brake pads and other high-temperature applications, and they are subject to regulations that ensure they do not release harmful substances during use. Compliance with these regulations is critical to ensure safety and environmental protection.