Document nmm3mOBaMo2353rv11N6zQjGX

Chios go 0. H. dans 3-7-51 Coffsyville Xux.RB8.Lab S.B. Coolidge, Jr ' August 23,1951 2185 Dry K7 Grind T This will finally acknowledge receipt of your letter of August 7 on the abore subject. We can discuss a good many of the fine angles when you come down. Ye are engaged in an outstanding effort to control our aine liquor better, especially with the idea of knocking down the silica content, in order to get softer lithopone quenches and perhaps ameliorate our dry grinding problem. The writer feels that benefits resulting froa easier dry grinding are passed on to the paint people, etc. Texture has many definitions. Thanks for calling the matter to our attention in such a good manner. C.E.Deeds sed cc: SBcf, JBB 0007--SWP-043825 N23286 Hr. J. 3. Boehner -2- Soptsmber 21, l?5l r think it is pretty obvious from the above that 87 grind did not show any improvement in texture ovor ths regular material for th 2135 type, flant trials on the materials fro* tho above car, likewise , do not show any appreotable difference. A* far as texture is oonoerned, it doss not appear that ths re sent Bird naterlal is as good as the old Bird samples In the ease of both tho 46lu and d-i+21 types. In the oase of the 2l85, la it poasible that ths 87 grind in the eaaeof the oarload, for tons reason would not produce as rood a dis persion as R5 or So grind on sons previous material? This seeas te be Indicated, at least. Also, for sane reason, it g> pears that we are not doing as good a job on texturs with the overhauled Bird as we were doing last year with the old oylindrioal oonioal bowl. It Is, of oourse, possible that these texture testa do not tell the whole story on U618 and W-421 types, as our purpost originally in making these llthopones was for ths purpose of per formance in emulsion, paint, and not altogether for improving texture. At any rate, I think the above ladioatea that we should taka a look tomales sure that the Bird is working satisfactorily, and. In the meantime, we will try to nn the U61M and 8-421 test smsplss to see if they do show other better-then-everage properties. C. F. Ad sms Minsrl Products Laboratory CHA taf ooi CKO J7H 0007--SWP-043B26 0007-SWP-000127176