Document LKgx1LXrje1n83nGz35J1RYaw

s\ TRUST 0032277 I t > ec: ASE ADVA A'S GHiF dost enrono / a. Ball/ j July 2, 1952 ^r.lor ull Cost any of California 425 First Btract han Franc lie* 20, California Att; Mr. :J.R, Morrison, i'lit. Purchasing Agent -entianien: w oava ysjr letter of June 20 ragarulng our -iyflo fcper-Cel flitar aid, an- t-.a caution racnslrad In connection w;tn zunilRi of our tiyflo oupsr-Cel. rloose ha advised that our Calita powders *ra basically olateaaceous alllca vt.lcr., la natural fora, la aaerpbo-s but w teh, if eaieiae-l, contain# a substantial percentage of crystallina silica. Hyflo super-Cal is a calcine*: pro met. the full story of tbe ozaet nsturo and oatart of the aygij itiwii created by excessive eoneer.tr* t ion of dl.-toaacoous eartu nn is not yot aaova. however, it la rather Aanarally accepted that taa tabulation of crysta-llne silica over extended parlous of tlxe is .'larmful. Joima-Nr:villa has eup.ortai extensive reaearen for tUo purrto of deternlalng the af'acta af its Caiita aatari&ls vban uaad uaner coa:ltleos taat produce dust, tnrsa lnver.tlgetler.s ara continuing and as of tbo prstart tiae we da Dot enow u.e coaplota ar.svar. however, va snov ena:gr. to warrant oir advising eustoaers (a) to ala laira so ar as possible tne dust ere-ted by t -e use of t>*o sattrial and (b) If tno nature of the use win not prlt tae roduotloa or tbo dust concentration to saf* iw-ls, to re-utra tr.a us# of protective devices. relieving are aoxo specific SUggO tiOOS. 1. Bag baa nine procedures snouid be aodflod to alalalsc bo; brassage. lags atieviid bo placed rather than thrown, riles snouid nave corner guards to prevent warehouse true* laasge. If pelletised, bags mould be withia pallet borders, act over hanging. 2. hplllsgo or aecuauUted dust should bo vocuua-cleerec |-.te :l: tely. Sweeping i 001 satlsrsetsiT ss it sard/ disperses the dust into the air, as does trues or fe-t traffic. Commercial, portable, inuustrial vacuum cuaaacrt ara available. f&ft -fCut?<6v<  2- 3. respirators, tuTln* t:.e 3.-. Bureau of Mires *?, roval for pnousoeeoioais dust, mwU be worn v..en har. II inj; ba<s, particularly Ir. confined areas. while we net yet know vn.-t concer.tr; tlons cf tne dl;toa*.eeous earth oust say be harmful, experience ln-ileutes t~;t respiratory .rotectlon aneul-.S be useu in confined areas sucu .a enc cunt ere i in carle*uin*. Attache! is a bruenure of the newest M.O.A. respirator vr;ic.. carries tae B-irea*; of Hlr.es approval, exceeular t-.e recuireaents for pneunocenleslt dutta. Similarly efficient respirators are nanufaccured by such reputable concerns as American Optical Cespuiy, Willson rrouueta Inc., anJ Pulaoaen Safety Lculpment Corporation. T:.e imperative feature la tnat the respirator csrry the E;rer.: of Mines approval for pneunoeofllssis-prouuclny dusts. retarding your specific <.vie*tlet*a v&lcn are not ar.svered in t:.e forefelt^, nyfle -uper-Cal Is not ; easy, it Is a diatoz-ca- ij silica, trades of Olcailto manufactured by uret Lakes C*rbon Co., are *lail*r acterlals. Our best Infer:- tion Is that uyfi# nay contain fron 20 to 50 percent cryitobellte. Tours very truly. CJGVlV- C.J. w'feil. Merchandise Manager TRUST 0032278