Document 5DX1vo2d8ZneRmmB3Ye1VpL80

FILE NAME: Union Carbide (UC) DATE: 1975 Apr 16 DOC#: UC237 DOCUMENT DESCRIPTION: Memo RE OSHA Regulations on Occupational Exposure to Chrystalline Silicca . e M.i JUIVJijM'i C-A R B *ID E*' "f/xi/ 7S" INTERNAL CO RRESPONDENCE MINING AND METALS DIVISION t c \ A e 0 <l<m : - i - a. . rW tsa V* A K ^ w.^0. P .S . JZZT.r. "5b ' F. 0. MX 579. MIASMA FAILS, NEW YORK 14302 T* { * # * ) O ivU ee tlN liw C*T t* Messrs. R. E. Byrne, J r . G. L. Dickson 8. L. Ingalls E. J . Kleber J. 1 . Myers-^ T. P. Norris W. C. Thurber J . E. Walsh File Oaf* O H gfaaM af D**f. fw w w w m g mTTw n n v April 16, 1975 __ '*, i - r- v "Calidria" Asbestos ` { 1 ^ a^efeE OSHA Regulations on Occupational Exposure to C rystalline S ilica The long delayed NIOSH C riteria Document to serve as the basis for ts ssuuggggeestsetde ^rreegauulfaatitoionns ^ffoolilloow^ ftih!e trgaennsemrailf tepdatftreormn NoIfOSthHetoasObSeHstAo.s Astsanedxapredc.tedA, tnhoer e f l l a t E S d T n r t a p p ly !' deffnit1on of a cu t`o ff e*Psure ^ v e l below wh1c* the th at i t w ill i i r 2 ? ! i t 'i l k* that the*recommended allowable level is so low ? for a number of common industrial operations to f^ r w a i;in l ? S ? It0 rl nE r*q"1r e5e2t is P articu larly burdensome as is the need f?ee ! l l i 2 1 u S to ,i? iiiater1*1 H f t l y 0ata sheets for a11 Pnibtcts containing recJnwnHitione ? 1 ^ o f i hese requirements will be tempered as the seeTtSdhi ft? through the rulemaking procedures but the basic pattern ttiionns iarebae yperaerttyorwmelo1resaewt*ay. This Procedure 1s slow and any final s ilic a resgul4a attached conrontaiy on the highlights of the proposed regula- S ! i i - r o r bia ! Sef!!1Dino ii* 11!l9w,,1th customers- You should be aware th a t we have tS* rg"J44 and have not found any evidence o f c ry sta llin e s ilic a , he pyrogenic s ilic a s have also been checked and th e ir exact situ atio n is not yet defined yo" wJth the appropriate position as soon as i t has been Until ***** *1?? ** strongly recommended th at you make no statements S L * ? . ? pyr09nic *111ca t e H a l s re la te to the regulations and suggest th at the customers using them check with th e ir supplier. Also, we have lim ited, secondhand, but probably relia b le information almost anyone sanding a finished tape jo in t w ill be w el/o v er the lim it. TM h1s may be useful to cause some reexamination of formulations th at are under revision to eliminate asbestos. . ,, i * If youuhave any questions, please l e t me know. A copy of the proposed egulations can be supplied i f you feel you need i t . 8 A 0 8 6 5 2 O 3 iBR:gt Attachments 3c , . ~rL ,*. /w 7 / . /ll^-rzJ-o H. B. Rhodes O- <' - . *" tr wi . SL'~- _. , - 'I-- 1 -': V - 4 ^ ' / , * ? / * " f ->-* - 2- A series of work practices including substitution, moisture for dust suppression, ventilation, and reconmended housekeeping procedures would be specified. I t is reconmended th at "sand** blasting with materials containing more than IX s ilic a be prohibited. Very extensive monitoring would be required for areas where workers are exposed to free s ilic a . Complete records must be maintained for 30 years. Sampling and analytical procedures are specified in d e ta il. The main tool is X-ray d iffractio n . A06654