Spun-glass is a unique and fascinating material that has been used for various purposes over the years. It is a type of glass that is created by spinning molten glass into fine threads or fibers, which are then woven together into a fabric-like sheet. This material is often used for insulation, as it has excellent thermal and acoustical properties. Other synonyms for spun-glass include glass wool, fiberglass, and mineral wool. These materials are similar in their properties and uses, and are often used in construction, automotive, and industrial applications. So, if you're looking for a versatile and effective insulation material, spun-glass and its synonyms might be just what you need!