USG Sheetrock® Brand Unaggregated Wall and Ceiling Spray .Jan 17, 2014 . SHEETROCK® Brand Wall and Ceiling Spray Texture - . Line . Raw materials in this product contain respirable crystalline silica as an . Self-contained breathing apparatus and full protective clothing must be worn in.material apparatus of line ceiling,Line - Martin MariettaMartin Marietta Materials: SDS for Line .. Use adequate ventilation and dust collection equipment and ensure that the dust collection . (C): Ceiling Limit.