Ceramic fiber pipes are not typically used for water supply pipes due to their composition and properties. They are made from ceramic fibers and are more commonly used for high-temperature applications such as insulation in industrial settings. For water supply, materials like PVC, copper, or stainless steel are preferred because they are non-toxic, resistant to corrosion, and comply with health and safety standards for potable water. Ceramic fiber pipes may not meet these requirements and could pose health risks if used for drinking water.