Document NN09d5VwXnykemawdKbEpMz6p

fl4191 1 i cl. / ce? F* H* Beadles, ..Ml, -8O30 i>, <S. Kennedy, Pbila.) In L, 3, Bate?,.* Phlla. )te W. B. Spaulding, Falla r , a , mmn3 C '(3,. Lamport, Lais. i P. L. mtehell, Lab. I. h. mfJinn&Bj, FMla. Jtf 8*5:2 Indexed mi s mmtmmm r e p o r t h o . m-w Philadelphia Plant tech 26, 1952..' io 6t *t 6i zim ciiRomfs mc d t y p e h s b ib b introduction Considerable difficulty has been experienced by the Phila delphia Plant with the subject primer. It appears that the long grinding cycles of the extender base cause a definite pick-up in solids due t pebble wear, This m.akB It quite difficult to meet the specifications for solids? gallon weighty and viscosity a well as the specifications for chemical analysis. Since this product contains a tough, torsi extender which' requires long grinding (30,000 cycles) t break the pigment particles, a grind like that used in grinding barytes for refrigerator primers might fee a possible solution to this extensive pebble wear. Summary and Conclusion A composite rail! base lias been ground .in the laboratory for 21 hours -(approximately 16,000-20,000 plant cycles) with satis factory fineness. However, other tests required by this product have not been made,. Actios Proposed . It is suggested that the Maintenance Sales Development .group evaluate this'experimental 1067*761 to deterine whether it is a satisfactory product. If it Is satisfactory, we will .arrange to run an'experimental plant batch to determine the extent of pebble wear, and to determine whether improvements have been made in solids, gallon weight., and viscosity relationships. Baperimental. Detail The formula for experimental mill base is as follows? N35446 M-351 H-287' H-152 0-398 -27 RK3?"3$1 -609 -3 -19 -422 RKP-351 0,3 20,0 2.2 .6 10,4 3.0 25.9 7.2 9.8 2,1 17.5 rind 8,000 cycles X Ratios gallon rriinndd 88,,000000 CCyyccleless XX rind 1 hour, drain 111 Cu.ft, factor * 50,25 100.0 AdO spin 15 win., drain X? The first portion was ground ten hours in the .laboratory., which Is equivalent to 6 to 8 thousand cycles in the plant. The second portion was ground the same number of hours in the laboratory. The third portion was given an hour1s spin to insure complete mixing of the resin with the grind portion of the base. This mad total of 21 hows grind tag or approximately 16,000 cycles in the plant. This latter figure is an approximation only and plant trial will be necessary to determine the exact number of cycles required for this product. PHILADELPHIA PLAJIT 'LABORATORY HAWsEI 3s, .ft, Witax DUP030003374