Document O15GeQD90ZxmYxgvkZ2yrkQbQ

sur nip.-.-j p,\hk t-i`: MlSS'TifAuCA. UNf APu>. rA*;A'. - 4 l. DEPARTMENT OF MATERIALS CHEMISTRY Non-metallic Minerals Section ASBESTOS-CEMENT PROPERTIES OF MILLED ATLAS ASBESTOS FOUNDATION f- 2...-4?:I . ;11: >. PLAINTIFFS EXHIBIT UC-254 Non-metallic Minerals Services Report No~ NMS 459-79-2 S. J. Thorndvke June 22, 1979 for Atlas Asbestos Company Box 805 Coalinga, Calif. 93210 U.S.A. Attention: Mr. Irving F. Moore President HONSTHf ONTANiO rCSk'VHTH FOUNDATION STIPULATE THAT T *`S LWCuMf N T IS SURJ*C I fOlMi KiLlOWINO TiNVS A\n CONTU I ANY PROPOSAL CONTAHifO MfflflN WAS PH fMMfO OH T*f CONf-flf K AT ION (if T*| Afll>UtSr.! ONI V 1 CONTI NT ? WAV NOT IM U* ! f *Y Ni rt l-i.fi .Cl any otmmi pahiv without cvb poh whitttn consint 7. any TPSIINO. INST'ICTION Oh JTimV-VH' CC* ;ri ( NOH OV*H I A1*tOYCS SHAH fc ntS^ONSUH. f * <.- N Y LOSS OH (.AV,.(, r.j . . . * -V' %c,, r*raAp;ct v..' N.THV ovftrr %?.#. r #t ,t f i i M' f TA.t. viL f.t Ol * A1.;h T. rnro.H ' i::%-"y i.lHf ) amt RCPOHt. MO^OSAW oh COOIATKih .> US IU 1 : uvt r. i :OMt lu T*.f U i'tiCui Atl ................................. (.* tl Mill Sufij.-ti uih HI (. II IN I Hipnfr.tuTATiON is maoi that vmiiam articles wtu of um ou/.;ut * no ncpff r iSSut t by uS SAU ue bum iSmeo n w*Oi i op in i wit mod i own nhoh wiurnN cons; a b OUH NAVI r.MAU NOT Of USf l> l\ ANY WAY IN CONNECTION W* fM fHl CA| I . M M .* Ahvl V I ij. *.* N (i* an* A*w. f i4i.*r;s:. on si *. INTRODUCTION A sample of Atlas asbestos mill fibre and four fibrized samples of the same material were received for rod milling and asbestoscement strength test evaluation. The fibrized samples had been produced under different conditions of fibrizer plate-separation and number of passes. The samples were labelled FEED, #1, #2, #3 and 4. EXPERIMENTAL The fibrized samples were used for the ORF version of the asbestos- cement relative strength test using 12%% fibre concentration- The fibre which gave the highest strength (actually #2) was retested with a rod milling stage before the strength test using either a 15 min. wet milling or 7% min. dry milling plus 7% min. wet milling. Rod milling was done in a 25 cm x 19 cm diameter mill with a 5 kg rod change, 20 g of fibre, and a speed of 64 rpm. For wet milling, a pulp density of 15% in saturated lime-gypsum water was used. Rod milling and strength tests were also carried out on the feed sample using either a 15 min. dry milling, 15 min. wet milling or 7% min. ary milling plus 7% min. wet milling. RESULTS AND DISCUSSION The asbestos-cement properties are summarized in Table I. None of the as-received fibrized samples gave high MR^ values but after wet milling the MR^ increased to 367 kg/cm2. This is much better than the strength of a Quebec 6D fibre and is approaching the value for a 5R. Tests with the milled feed indicated a maximum MR^ of 340 kg/cm2. Except for the as-received fibrized samples, the drainage rates were all very low, averaging about 2.2 ml/s. CONCLUSIONS The highest MR^ obtained in a limited number of tests with the latest series of Atlas fibres was 367 kg/cm2. This is similar to a Quebec grade5R fibre and was obtained after fibrizing and then wet rod-milling for 15 min. The corresponding drainage rate was only 2.7 ml/s. None of the samples which had been fibrized without further milling gave strength results equivalent to any of the milled fibres. ST J. Thorndyke Associate Research Scientist D. J. Pinchin Associate Research Scientist pmt / mTO .u3 aoCJ a un Ham 3 3X o Kl --' H O rH m CN CN H O CN CN H n-* SO cn om cn rH cn cn o in o m cn & ASBESTOS-CEMENT PROPERTIES OF ATLAS FIBRE * Averaged fo r two plaques p e r sample * * Four plaques CJ >,-> 00 4-1 cn Umo fl) c~>- \ m m so m m JS SO 00 CN no f** 00 CN sO SO > CJ 01 rH rH H rH rH *H H rH < oH t0o) aj CCOl u a *a 0a1 mQ QHx o >4 Pi o o cn cn cn so in m n rH cm rH cn .CM CM cn co rH H O cn CM rH 4J cCl E CJ a 0 CJ o> 1 cc <11 CO 2 Ji'if 4o4 a > iHcj ^& Ov CO tn rs. o SO SO O so <r cn m as r* m o> rH so m m in o as r^ o m no CJ < X XH a < TJ o O J-* u 3: xj (cit ps fH o o CN *H vO r* r*. <r O CN CN O *H o GO o -a* CN CN CN CN CN CN rH CN CN Cl CO ^ c a n NO o CN \D rH cn cn CN SO iH t-H CN m cN CN NO o CO C1-31 CS wE O in NO vO CN *H CN rH CN a 4J 4-1 o a o a 4-1 . CJ >v > CJ 4-1 CJ a CJ a CJ n 3 J"4 H s ai > > > : o -o o & -H iH H -rl CJ c 01 CJ OJ M OJ OJ CJ <J OJ 01 HU OJ CJ CJ c 3 crt C "r* h e cH e -h h e c H U EE e E E HH o 1 CD < 1 01 < 1 0) <c 1 m < _ JT* m rH Jt* > " + m rH Jf* Jf* f7* r + m rH rH CraeOt *rSHs ,ffW<NHHodD MaNHo =CM= X ifHn a JNCr4Jl X cn: -UHr TJ Na) pfVOH* <r -H a JNCr4Jl CM X*(brl a UCNrJl =CtMe X*fHri <dD ^<4D 0<dL)> k k a fCanJ