Fire-retardant vermiculite is a type of vermiculite that has been treated to enhance its fire-resistant properties. Vermiculite is a naturally occurring mineral that expands when heated, creating a lightweight, fire-resistant material. It is commonly used in construction and other industries for its fire-resistant and insulating properties. Some common applications of fire-retardant vermiculite include: Fireproofing structural steel   Manufacturing fire-resistant boards and panels   Creating fire-resistant coatings and sealants   Insulating high-temperature equipment and furnaces