Document mbkjJNQ8yQ2bXXgLq1wab1k0d

nr. wadAfll. / W (J ?<4'/ - 2 BT ACT Hklb 27th Ootobar, I96X. Mr. X. L. Moor*, Dlr*et*r, R**.roh and D*T*lopa*nt r*p*rtw*nt, R*jrt>**to*"Monh*ttan Xno., D.8. Aab*ato* Division, N*nh*la, P*nn*ylv*nia. Dear Bob. K*dd*U' replying to your'" th* 11th Oetefftr. Th* qu**tln' haa poaod Jm a difficult on* and 1\without doubt tho ollar quaatlon. I u our* )p will pproolato only roally Mfomwbor n tho 1 atwo*ph*r* la nil*'but, b*i wn and British aab**toa t*xtll* wnu ozporli w* oonaldor It Uk*ly that a two thr*o flbroa p*r 00. In tho ilu n 100 orona would oonatltut* 1 a*f working >ould add thla aaauwaa that; th* or*rail rals dlatrlbutlon la aa would norwally b* In aab*atoa t*xtll* pro***alng. X an afral th* wfeev. la rath*r vagu*, but Z aa aur* you Ll approldat* that thla toplo la fraught with dJ loultloo, nut Z hop* thoa* aoawinta will bo^f 1 valu* fWyou, Kind Aogarda, Toura.alnooroly. WH/HB :opy jm R^YBESTOS-MANHATTAN. INC. Uhttza Statu Astern* Division MAMHtlM. flNWYLVAMA RutJUtCH k Dkvklotmskt Dkpaktkint October 11, 1961 qflv Mr* John Waddell Turner Brothers Asbestos Company Ltd. Rochdale, England Dear John: I sent the Turner Brothers Asbestos Company Ltd. answers to the Textile Department questions to our General Asbestos & Rubber Dlrlalon, North Charleston, South Carolina* They were especially interested in Dr* S* HoLoss* report "The Collection and Examine tion of Airborne Dust*, 14/7/61. Mr* Hawkins, their Engineer in Charge of Dust Problems, asked me the question - "What does TBA consider the threshold value for fibers between 5 and ICO microns?" I believe by "threshold value" he means the maximum permissible quantity allowable* Any information that you can send me will be appreciated* RLM:bfw Very truly yours, c R. L. Moore, Director Research and Development Dept.