Document 37B8by7MX111X0bkOvvmXkD00

FILE NAME: Kaiser Gypsum (KG) DATE: 1970 Apr 1 DOC#: KG006 DOCUMENT DESCRIPTION: Internal Report - Asbestos Toxicology Report IHt OIJCOVTKT courjurr UNION C A R B ID E CORPORATION . BOX K V--.j J!!l 970 F~ KING CITY. CA. 9 3 9 3 0 ' < T E L . 4 0 8 383.C ASBESTOS TOXICOLOGY BCTo p t it i u i r i ^ T s Z i : arf V R asbestos <" < * * known a s b e s t o s ! and 2 r e l i e f t Ia ` " V " - condition be- o f aabeatoa d u st. With fu rth er experience ? *posur ta concentrations with asb e sto s without development o f Tun It w*8 found that men could work kept below . c e rta in l e v l l . 1 ** U dust n e eat ra t ion s were It i1 % S L f t o e^ 1myoa r t ehPLeV ^ \ io n WO; l etri 1 11 " 0t d" ^ " - ` - i . i f i f th is exposure continues " r i l s t i l l / ? " CUbic foot of even cases of X s t o s i s ta o t^ v " U *ti ae` no tain ed a t or below t h is le v e l the ACGH ( m ** 03ures bave been nain- value (TLV) in the D S 4 t l - ? (whl<:h 3ets threshold lim it asbestos to 2 J L n p l r u i l ^ \ r to W th* TM fo r a fe ty fa c to r in corporated in the lim it 10 T h e V ^ n ^ " ! ? t0 in crease the already issued a regu lation under th" s h ^ v I department of Labor has asbestos at 2 m illion " Walsh-Healy Act placing the TLV fo r a. t l u j h . . , i. S TM r s ir s presen t. Usually the dust eonont*-i f o r * * " ' . . = i a W h ich u h * " is 5 ," r*U l " causing a Tyndall effect i s p e r cubic foot (MPPCF) before i t s n rea BU? t froffl -10 B i l l i on p a r t ic le s conditions. * lt# preSeaC* 13 r is ib le in average l i f t i n g Of can eerou sh um ors^^especially^of t h l 1* * " " lncrease in th* incidence Hecently there h a v ^ b e ^ r r e S t s o f s o m e ^ i.` : 3 C iated-',lth asbe5tQ3ia' exposed to a sb e sto s dust but who h cancers occurring in individuals i a believed by 2 " a S r U i e s th a ^ ^ h e s exp osu res s i g n i f i c a n t l y exceeding the T h r e s h o l d ^ ! " aeiu e ? " S C lated ^ i i t i P! , ? L ? anCer naned ooth eliom a b -s been noted to be asso c ia te d con siderable evidence th at c r o c id o lite * i i l l t ' TM eaf.l l e r * Ther* i s m esotheliomas. From the data a v a il.h i * 8t fre<lueatly asso ciate d with p rFoblnemot cbeonltoiwn ueenso. ugh o P 2 . 2 g a in st me8sPo?thf eTliom^a. Rthesenarvchoofn5thMePPCF Uni on C a rb id e 's CALIDRIA A sbestos 01-5 i s ch rysotile, not cro cid o lite. - 2- Control o f asb e sto s dust exposure i s th erefore necessary. The control methods are the standard ones a p p licab le to a v ariety o f dusty operations. They include closed flow system s, wet p ro cesses where p o ssib le , and adequate exhaust v e n tila tio n where openings in the system are n ecessary. P e lle tiz in g i s sometimes used to improve the handling c h a ra c te ristic s of otherwise dusty m a te ria ls. Where s a t is fa c t o r y containment to stay within the Threshold Limit Value i s im p ractical or im possible, e f f ic ie n t and r e lia b le re sp ira to rs are a v a ila b le fo r the p ro tectio n o f the employee. A program o f environaental monitoring i s highly d esirab le to determine that Threshold Limit Values are not being exceeded. In manufacturing in d u strie s i t would be desirable to know the dust concentration.- where the asb e sto s i s dumped from bags in to the p ro c ess. Concentrations v Id a lso be determined where dusting occurs in fin ish in g products. While i n i t i a l dust determ inations should be made a t frequent in te rv a ls, once the level has been establish ed as sa tisfa c to ry , the frequency may be extended to occasion al t e s t s to assure continuation o f a satisfacto ry condition. Pre-employment and p e rio d ic physical exam in ation o f workers are d e sira b le . These should include ch est X-rays to in su re that the worker has no chest condition p rio r to work with asb esto s and to determine that no lung changes are re su ltin g from work with a sb e sto s. I t i s believed th at the addition of asb esto s at the proposed lev els during ' the manufacture o f products would be harm less to the consumer. Total dusting would have to be w ell in excess of any l e v e ls acceptable to the consumer fo r the asb esto s concentrations to approach the Threshold Limit Value. In conclusion, while asb estos dust in excess of the Threshold Limit Value i s p o te n tia lly harm ful, a s are many other d u sts encountered in industry, i t i s re a d ily co n trolled a s oth er such dusts and i t can be used sa fe ly with appro priate precautions. In d u stria l Medicine And Toxicology Department Union Carbide Corporation Revised ^ - 1-70 CAL- 1 3