Document gE60mZ2vML6xy8pJ2K5VpvOma

INTERDEPARTMENTAL COMMUNICATION -------- DATE: TO: Mr. J. B. Moss LOCATION: FROM: L. E. Winter. LOCATION: SUBJECT: Comparison of Seven All Purpose Compounds wc PH Bond Workability Shear Shrinkage Edge .Crack Wedge Crack Hardness Adhesive Viscosity Working Time GP (Gypsum) 60 8.7 100% Good OK Good Good Good OK V inyl 440 30 min. GP Sterling (Casein) Gold Bond U.S.G. Texas In-Tex 60 9.0 100% Fair OK Good Good Good OK Casein 440 20 min. 70 8.4 100% Good OK Fair Good Fair OK Casein 580 30 min. 72 8.3 30% Fair OK Good Good Good Soft Casein 520 35 min. 68 - 60 8.35 8.7 100% 100% Good Good OK OK Fair Fair Good Fair Poor Very Poor OK Hard Starch S tarch 460 460 35 min. 30 min. 60 8. 85 100% Poor OK Fair Good Poor Hard Starch 460 10 min, We listed the different brands in order Of quality, GP being #1 and In-Tex #7. LEW/om cc: Messrs T. W. Richards c. w. Lehnert D. C. Corkill W. N. Gettel K W. Brown D. M. Watson E. Schram L. E. W. SGP 0015860