Rock wool and slag wool — produced by spinning molten mineral or industrial slag into fine fibers — are widely traded thermal and acoustic insulation materials used across construction, industrial piping, and HVAC applications. The physical form at import (bulk loose fiber, sheet, or roll) affects both classification and freight logistics, with rolls and sheets commanding different pricing tiers than bulk fiber. Importers sourcing these materials should be aware that certain mineral wool products have been subject to antidumping proceedings, making origin documentation and mill certifications commercially important.

AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.