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USG Interiors produces a family of wet felted acoustical ceiling panels at its Cloquet, MN, and Greenville, MS facilities having various light reflectance, noise reduction, and attenuation specifications with various levels of post- consumer/industrial recycled content. These production lines employ a wet-felted technology in the production of acoustical ceiling panels. Wet-felted acoustical ceiling panels contain mostly perlite, mineral wool, starch, recycled paper and clay. In smaller amounts, other raw materials used in the panel forming process include flocculants, biocides and defoamer. The finishing and packaging unit processes are dominated by the use of water-based paint, which contains the following ingredients: calcium carbonate, clay, latex, titanium dioxide (TiO2) and other chemicals. Shrink-wrap and corrugated strip are used as packing materials.