Document 0r8jEv2DpVJbwJNbOZpbodQk

(PLAINTIFF'S, v j^EXHIBIT^gl I "/V usg43 51':^`;:v INSULATION RESEARCH February 11* 1958 Mr. A. L. Jonee JOPLIN PLANT Ret Substitution of DSO Industrial Whits Plaster for Whits Portland C#umt in One-Cote Cunt Formulation Laboratory tssts have boon completed to dstemine ths amount of USQ Industrial Whits Flastar which can bs usod as a substituts for whits Portland otaent in our Ono-Cote Csaont formulation. Bassd upon our experience with ths gypsum plastar supplied by Bsstwsll Certain-Teed, ws nods laboratory batch tssts in which various degree* of substitution wars triad* Ths rssults of thoss tssts show that ths USQ material ean bs ussd to ths same sztsnt as found for ths Bsstwsll Csrtsin-Tssd satsrial. It would sssa roasonabls tbsrsfors that ths proposed formulation revision sspGLoying gypsos, which ws cave in detail In our letter of January 17 1958 addreasad to Kr. Christner, should work squally as well with ths USQ material. Ths savings reported for ths Bsstwsll Certain-Teed material should bs dapLlostsd with the USQ material, as their quoted delivered price is ths same. At ths present time, neither of these gjpmma from these two potential suppli ers has been used in plant batches made in accordance with the rationaided revised fonsulation. In ths oass of BeatmU Certain-!sad, we have receiv ed 300 lbs, for that purpose and are awaiting word from the Joplin Plant when same test batches ean be made. In the oaee of the USQ material, the only material tested has been the 5 lbs, which wo received for our laboratory evaluation. FLL/s oo t Mr. Glen J. Christnsr Mr. L. E. Cook ^ Paul L. Loss# 083380 UHR 000226 f* I