WAC 296-17A-3102. Classification 3102

3102-04 Stone wool insulation: Manufacturing Applies to: Businesses manufacturing mineral wool insulation from siliceous materials. Materials used include, but are not limited to: • Glass; • Rock; • Slag; • Other siliceous materials. Work activities include, but are not limited to: • Blowing hot air or steam through molten rock or slag in a special furnace. • Drawing molten glass at high speeds through orifices, then subjecting it to jets of high pressure steam which break the glass filaments into fine fibers to produce fiberglass insulation material. • Shredding the material into a mass of fine intertwined fibers to form the wool. • Forming and shipping the final product, such as granules which are bagged, or flat sheets which are cut to size, enclosed in paper or foil, and packaged. • Incidental rock, slag, and glass crushing. Exclusions: • Digging or quarrying of raw materials is classified in the classification appropriate to the work being performed. • Manufacturing asbestos products is classified in 3104.