Document by35gLxyZLORjMZnm3g93NJE1

FILE NAME: Union Carbide (UC) DATE: 1970 DOC#: UC040 DOCUMENT DESCRIPTION: Asbestos Toxicology Report T I * * Ot$COVf*T COMPANY K * C i IV-iU Jvi :< .' id70 CWAM..AIS N g .*_ ^ * P- UNION CARBIOC CORPORATION . BOX K k in g c it y . c a . 93* s o . t e l . 40 a - s a s ASBESTOS TOXICOLOGY BEPOPT sn s r r . ' ? u*&'SLSJ2LTM sS S S ' i s s s ="" ?: asbestos to 5 Jr indlcated thy intend to lower the TLV for t h S h!ve i u r i a ^ M 11 par^ cles ? er eubic foot for public extracts in which iw " jurisdic.ion. This concentration of dust is generally not v i s i b l e in the average work area unless a bean of light causing a Tvndaii !fr ? ^ s hr e 4 8en reporta of 80Be cancers occurring in individuals exposures significantly exceeding the Threshold Limit Value. tithPL w ! ! BC*r nafflCd ? e8othelioBa baa ben noted to be associated ^ I b e - to h f e3C?osure ln recent years. These tumors, while rather few in e r a m r * ^ ! 'v3i exposures, and that CCUr in individual a as much as twenty to i* t h histories of only slight forty years earlier T h e considerable evidence that crocidolite* is most frequently associated with *ynot be1"?!!* Fr001>,t*e d,t* available ** appears that the TLV of 5 MPPCF problem n t i n u e s ! ^ Pr t#Ct *6ain8t Be88th8lioma. Research on the Union Carbide's CALIDRIA Asbestos C .l-3 is ehryeotile, not crocidolite. I s i < -2- Control of asbestos dust exposure is therefore necessary. The control methods are the standard ones applicable to a variety of dusty operations. They include closed flow aystens, vet processes where possible, and adequate exhaust ventilation where openings in the system are necessary. Pelletizing is soaetincs used to improve the handling characteristics of otherwise dusty materials. Where satisfactory containment to stay within the Threshold limit Value is impractical or impossible, efficient and reliable respirators are available for the protection of the employee. A program of environmental monitoring is highly desirable to determine that Threshold Limit Values are not being exceeded. In mar.'ifacturing industries it would be desirable to know the dust eoncentratier.:- where the asbestos is dumped from bags into the process. Concentrations w Id also be determined where dusting occurs in finishing products. While initial dust determinations should be made at frequent intervals, once th* level has been established as satisfactory, the frequency may be extended to occasional tests to assure continuation of a satisfactory condition. Pre-employment and periodic physical examiniation of workers are desirable. These should include chest X-rays to insure that the worker has no chest condition prior to work with asbestos and to determine that no lung changes are resulting from work with asbestos. . It is believed that the addition of asbestos at the proposed levels during ' the manufacture of products would be harmless to the consumer. Total dusting would have to be well in excess of any levels acceptable to the consumer for the asbestos concentrations to approach the Threshold Limit Value. In conclusion, while asbestos dust in excess of the Threshold Limit Value is potentially harmful, as are many other dusts encountered in industry, it is readily controlled as other such dusts and it can be used safely with appro priate precautions. . Industrial Hedicine And Toxicology Department Onion Carbide Corporation Bevised f-1-70 CAL-13