Document QkN5LmKvwRZ3vvgzQYO8XoYQo

FILE NAME: DuPont (DUP) DATE: 1966 June 2 DOC#: DUP034 DOCUMENT DESCRIPTION: Letter to Dr. Arthur Stevenson from G.J. Stopps - n e t 1907 fiir * c}irm l pulKTO&ry d i i t i M b u been reeogaixed " ^ lwh th is r * e o s s l,.la o caas c o n tro l measures ained a t reducing the f i f ' P TM * ^ * = 12 * th . m lala, o f th* erud. s l a c t .l o d i t . i u i ^ o S t . f ^ a * SJt V*T* `'P* 60 P TM m t th dust th a t v u produced fro a baln g -an^l*d. This n t tha w a rin g of dint re s p ira to rs. ^ rcaev^d ecncara over tha harards o f asbestos has been tha S i , * 3\ ! Pi * ? , a t v l l a k U t v e * tT P o f cancer and exposure to asb esto s ` lbe* ;. beea *=&*tr*td, not l a tha trade* u s u a lly thought o f a titu t^ ag tha ts b a s to c in d u stry " where dust c o n tro l methods have baan l a uaa -- r y e a r s , but la ruch occupations aa in s u la tio n workers and pipa c o v e re rc . ___ ^ * r * thr^a fa c to rs which ara d isq u ietin g about that a nr h ealth problem tha uaa o f a sb e a to s. F i r s t l y , tha p o ssib le a a .c c la t io n between can cer M " to#,, n a tu ra lly is a ea t ta r for concern, secondly, such evidence aa thara la . to an `in cu b atio n " period which m y ba as long as fo r t y y e a rs and t h ir d ly , -bar la os* ra th e r fra g a u n t*ry avidaace th a t sh o rt exposures to ap p a ren tly s s * l l co u n ts o f asbeatos f ib e r nay produce cancer many years l a t e r , A t th ia t i a s our nowledga ia i n s u f f i c i e n t to a a i w tha question "what ia tha s a c l l a a t amount o f s a t and tha sh o rte s t exposure th a t eight produce can cer?" f r c a a p r a c t ic a l point lev i f tha dust doea not gain a ccess to the body there w i l l be no problem, --e x e io r e , d u st r e s p ir a to r s w i l l p ro ta c t tha personnel wearing them. Operations which produce asbestos dust should be signed so that tha dust is cctain ed and exhausted in to a system th at w i l l prevent r e - e a tr a ia a e n t o f the abastos fib e rs. easterners should ba advised th a t th ere ia seas haxard a s s o c ia te d w ith w ort Lag i t h asbestoc and th a t s t r i c t daat c o n tro l a t u u r t i must ba taken . I f personnel i l l caadvoidably ba exposed to a sb estos dust, they ahould wear dust r e s p ir a to r s . aiteh s. c. rrrvB < sc* i m| **w l a Brr-r c i t e s perhip e th e r fib e r s such i t g li could be used la place o f iU ltC 4 , l a attem pting to n r a people o f the health hazard of e*beto* I hive beea hiadlcipp-ed by the I n m o e r ib le uses o f the m ineral bo t h i t I t become very d i f f i c u l t to l o c i t e group ueh e your t h i t i r e vo rk in g v it h the m a te r ie l. Should you know o f o th er ouch group I should be g r a te fu l I f you mould l e t me kacw o f the. I f I c ia be o f fu rth e r e s a ls tiD c e p le a se l e t me knew. o rig in a l sign ed c . J. STOPPS C. <J ftoppi H*B*| B.S. Chief, ?hyiiology Section CJS/Jtd