Document yb22mow2nBbXV6pG2zEQd6yqr

y (Tsr. cor`.p.*.::v >:;o !::rr.;.-ot:'.*.aTMF.uT/.L :oKr.::?otiOGMCE \; TO nc\ T rnoit: Robert R. Ozurllln oate: November 9, 197?. subject: :!?.? PATixrr o\z - (:. ltearuiti-: - co:rrAit:ixc i::sui.\tu:s MATERIALS FS 775 on r,w- iy. of n s.v-ple of Hodman Fundamental Cationic Fibre (MFC?) a \'tr c.c ir.vorr.cory c.::perimcr.tal tests were conducted in order to dc-rcr- the b.-..?*its .-.;ni rrnpe of percentages that HrCF could have in water I,-.re PRO" and r.-.C.' W. slurries. Tests ns. re the compatibility cf V. 4 . C'.' vit'i vraijus refractory fillers (page 25) without the use of asbestos re very The refractory fillere which were tried in our bn *.ie PRO ".X 31 included Anthracite coal, olivine, calcium silicace, '.'i -iif.siLo. , w:!';.;:, hyr.nitc, aluniuc., S?03> chrome iaa:;nc5ice and silica ' i:or-r. 'i of ::he fillet.': formed well and the physical properties (pa.'vs 26). o i;:inri Trc::> the pads were encouraging. The following recipe was used fer l:-. ; fill*:r testa. Raw Knrp.rJ.nl Z Filler KrCI* (other deri.p.1. cions K5236 L X322G) Renin Slap. Kaol Ciatcnice 76 4 5 11 4 Thu urgency of the removal of asbestos from hot tops used by REPUBLIC STEEL hey,an in .Vot ember of 1972. The original PROfLZIC" C recipes used by REPUBLIC -TEEL in their hot top insulator boards and one-piece cops contained 15Z asbestos. The recipe which was designed to replace the PROFLEX- C scries v'as in the fort* of EF-5267/rxCFLEX (formerly X314858) (pare' 73). & - EP-5267 /PR9FI.EX ^ Recipe Raw Material V Silica flour Dlatoiaiee Resin Alumina Silicate Fiber Fiber-lass i:rcr Asbestos 49 25 2 10 6 7 1 1316 *  :i.'C.T is o pr i i-,-i r ' v .i mi:.; n';- i wt: d i :;pcrr.i.nn .1 .mt. S'i?:p'-::tion ifvtrt were (;.-i v 93 j or, 1."7 ui lii .u.i wich,*'i the use of :1I-TK. The test or.c-s a l Oho ml. raduntr \.hic'.i li.is a iiej'rhf of ]'<" and Is 2-3/.'-." 1) (!in'i-ct-r. *uc slurry to be crstini is mixed ell and poured to t!ic 1000 ml i .p.rr.rr. After interval.*: of tiM?, '.be solids settle and in .'.one cases rise. Tii>.- liquid >..!iicii divides Che single or double l'yer of solids is measured and recorded nr Z water. The foraiulr.tiur.s which have a tendency to slowly rise to the surface, are the better suspension slurries. The experiment showed t'.-.r.t'. i he slurry wirii ilrCr did rise anti had abed or overall suspension of , water as compared to 27.'. aft er15 minuter.. fifteen minutes is the optir.ium tine usaii for all slurry suspension rests. Mirrorsior. of rue fibers is somethin;, that can only be seen and not measured. !!T'flF in ccr.Mnation with a surfactant disperses fibers sufficiently to form n honoptneous slurry which is neccsxarv for "ood fiber orientation during the forain'", cycle on production machines and satisfactory surface texture of flit various shaped hoc cops. Three producti'*n runs totaling over 2,000 hot cops verc produced successfully on production machines ro::i E7-5267/PP.0F1.E4 . Hot tops included one, three and four cavity tcols. Tue >r'371 and C572 (pares 27 and 72) were the part numbers produced on Foscco Hark III machines. 1'hysical properties including the Ami tec net heat transfer (also enclosed) were all satisfactory. Only the . resin level was adjusted to the optimum durin the first production run. Verbal reports from the field heve indicated yields have increased 24 at AE1V3L1CSI'Ei'.L. Warren, Ohio with the nsayc of our EP-5267/P.TOFI.EX' hot rops. The ninis'um amount of HFC? needed for proper suspension opd dispersion of fibers in a PUOi'LtA and PROFAX- recipe is 7 4 (pay,6 69). The ranpe of from 4% to .00*/, HFC? va3 experimented with in water base slurries (napes-----2, c3, 90, 91 and 92). The firsc experiment was tried by veins 10'K. HFCF slurried in water (pate S3). The solids concentration was coo low and all the slurry passed throut.h the screen. The second, test conducted was with 967. HFCr and 4*4 resin (pa~e ?0) at a hither solids level but ar.ain the slurry passed through the screen. The following tests were conducted with levels of liFCF at 907,, 707,, 50X and 304 in a PRUTT-ETC' type recipe. The form ing tines were Affected trendy as the MFCf was reduced. The fonninr, is constdered to be the cine it cakes a pad to ba formed from the slurry. Formino time is very important for it is one of the determinin'', factors to whether it can be made at all or produced economically on a production basis. Hie best ranqe of '.'.rCF in PROfLEX * is from 77, to approximately 304 because of the satisfac tory physical properties and nose important bein'* the forninr, times. The ranye fro:.: :!:CF from 304 to 904 formed satisfactorily but the fornin tines were much too ui-.h to nak it economically feasible to produce even chourh the other physical properties such as ssrenyth and density were acceptable. -I a 1317 * I'Mjwf-.illy, you uj.11 now h::vi- uf f ic j i r l uiiors.*' iu: ciiii-d to the r'j.jtrnr.ienC:: uf cho i'.ii or.t need additional informat ion. vs* will he happy u- i work prorTcsscr. with Cite vine of IlFCi'. jMw't'ff a -pre ii t i cat. Ion If vtv i'.-cl Lh;'.I you i r to you as nor Sincerely yours. It'ih-rt P.. lianrilla