Document Q5jMaKqeeX56q9n1obbppLM6

i SUITED STATES GXPST21 COTPAHT RESEARCH LABORATORIES PROGRESS REPORT SUKHABX Project Ho. 82062 Acoustical Plasters 2-27-53 E.S.J . A.L.3A 1. Conversion of Audicota from the paper fiber formula to the asbestos fiber formula, started by trial shipments to the Chicago area, vill be complete for al.1 markets from both Ft. Dodge and New- Brighton b7 mid- February. *j? 2. Job reports on the new Audicota formula indicate (a) Complete fiber dispersion on wet mixing. (b) Greatly improved ru3t inhibiting characteristics. (c) Working qualities and freedom from fissuring superior to that of competitive materials. (d) Increased profit to U.S.G. (35k5/=ior.th based on estimated 1958 tonnage.) 3.Fire resistance tests by Bureau of Standards on materials tested in 1953 are outmoded because of reformulation of products and addition of Audicota to acoustical plaster line. h. Questions submitted bv Texas Lathing Plasterers Ass'n. on acoustical plasters with our discussion. 5* Surface hardness of Hi Lite Acoustical Plaster samples was markedly " " ,, improved by carbonation. Recommendations were made to Gypsum for similar treatment of Sales samples. 6. Automotive Prep j?79 was ineffective for removing rust from Audicotebecause of a more prominent discoloration which appeared after "Automotive Prep" drill on surface of panel.