Document ZJRGdx6OqZ41EMEOGjdzr93E0

PLAINTIFF'S EXHIBIT DOW-1155 E. K. Hayer - T/26 ASBESTOS-ruCE KAYLO Jon L. Kansan, ."..0 September 20, 1972 Owens-Coming ttberglas Corporation has for itany ytan marketed voder tha trademark KAYLO, a oaldust allieata asbestos containing high temperature lmaulatlcn product. During tha Manufacturing and installation of KAYU) products, 'irboma con can trat ions of asbaatos containing dust are ganaratad. over-exposure to airboma asbaatos dust for long pario-rf of time is known to causa a fibrosis of tha lungs callsd Asbastosis, Cftan this over-expoaure nay not ba subjactivaly offensive to tha wo Hear. It usually talas free 10 to 20 yaars for tha first objactiva clinical sign of Asbastosis to appaar. Irreversible and progressive ling scarring will tharafora occur in over-exposed workers before it is apparent to tha sum or on medical examination. Likewise, oeeigietional exposure to asbestos is known to ba causely related to carcinoma of tha lvmg mi malignant mesothelioma of tha covering or plaura of tha liny. While tha airborne concentration of asbestos which will causa Asbastosis is reasonably wall dafinad, It Is not well established what level of exposure Is related to ling cancer or mesothelioma development. Tor these reasons, it Is aost desirable to reduce tha airborne con centrations of asbestos If at all possible. Tha bast eethod of protsctiai against asbestos fiber is obtained by controlling the generation of fibers by substituting a less hazardous Batarial - in this ease, fibrous glass. Tha second bast method of control is to limit tha sneiait of dispersion of released fibers into tha work place. This is a difficult tank even In fixad locations such an insulation Manufacturing plants. Dispersion Is cootrollsd by engineering naans such as isolation, enclosure, exhaust ventilation and dust collection. Such systems are difficult and costly to design, build aid maintain. Tha beat designed and installed systems will often provide a falsa sense of security if they era not rigorously maintained. Basically, you again art relying cri human factors which often are difficult to oeotrol. In areas of msnufaeturlng plants and at installation sites where engineering methods are not techni cally faaaibis, respiratory protection la mandatory. Personal respiratory protactlcn is a poor third choioa behind substitution and engineering methods to ccntrol exposure to asbaatos. While respirators either of the air purifying or applied air type 2 418 0057 .' <tO<VMl * .' t ***-L*u--l**"iJ"U .* :;ir:t7Tt> u:* :;xe*a u:i ?i mt| ;a. 2 will provide technically adequate protaction under ideal circumstance* they often do not provide adequate protection under actual use conditions. There ere several reasons for this. They eay be ao im con fortable aa to be burdensoma, hence worker* will not wear thee properly. The various types of respiretor* Motioned above are designed for varlova concentrations of exposure. If the capacity of particular type of respiratory la exceeded it will fail to provida adequate protection. In the manufacturing plants it is not likely that concent rations of airborne aabeetos will vary (neatly vsilass an eaerteney occurs. However, during field application of the Insulation where no re workers are expoeed to asbestos than in manufacturing plants, airborne concentrations of asbestos can vary widely at the sate exposure aita. Another reason why respiratory protection is less likely to sucoeed is that these devices nust be properly worn 4md maintained. In the plant situation there is a better chines of having an effective respirator progran which would Include individual respirator fitting by a knowledgeable individual, instruction in usage, periodic collection - often daily - of the used device for cleaning, servicing and reissuing. In field locations, especially cn con struction work, properly fractioning respirator program are much lass likely to be a reality. In the field during installation of asbestos insulation, especially at coavureial construction sites, permanently located engineering controls ere often inprietical because of the changing nature and nobility of the work. Therefore, all hand operated and power operated tools which may produce or release excessive amounts of asbestce fibers aust be individually fitted with local exhaust ventilation. In addition, work practices both la the plant aid on the site of installation must be extremely stringent in order to prevent airborne concentrations of asbestos. At fixed plant locations where airborne concent ret ions of asbestos fibers exceed exposure limits, change rooms are required with two eeta of lockers - one for work clothes and one for street clothes. The employer aust supply special clothing such as coveralls, reeplrreore, gloves, head end foot coverings for all esploysea whose airborne exposure exceeds the celling lave 1 for asbestos. Asbestos contaminated worker clothing auat receive special handling and Hashing to prevent dlisaainatlon of the fiber. In order to determine exposure levels to asbestos, It is neeassary to carry out Industrial hygiene ncnitorlng at every location at lsa*t 02 418 0058 ***** (( ;i ;*:*i:nin**m. -m ?n X ; 1i: u::r:*ir? 3 every aix months id mors frequently if it la reasonably foraaaan the exposure Halts Mill be exceeded. Th samples and thair analysis auat b* carriad out by axperianeed personnel ia order-to have tellable rasulta. At tha praaant tine tha tabling aatbod aod analytic technique la mder-goiag review bacausa of variability ia rasulta in| contact technical personnel. OSHA standards raquira that all workers who ara axpoaad to airborne concantrationa of aabaatas auat receive nodical examinations within 30 days of thair first txposurs, annually and within 30 days of tamination of employment. Where employees constaatly chant* aoployaant but contiaua la an a*bat to* exposure, thay naad to ba examined only ones a yaar. Tha exaaiinatien auat include as a alniaua a chast roentgenogram, a history to alicit symptomology of raspiratory disaasa and aalsctad p uleonary function tssts. Many physicians ara not equipped to carry out pulmonary function tastin' and do not hava a apart it* in tha diagnosis of as bat tot ralatad disaasa. Tron tha foragoing comments, it can ba saan that as bat tot can ba safely usad if stringant (assures ara obaarvad. Ba causa tha protective o* asuras ara numerous and cosplax thsra ars many potential opportunities for workers to ba over-axpoead to asbastoa both during tha aanufaetura and installation of calcium silicate insulation. for r*asons of worker health, asbastos-fraa KAYLO has been developed. Tha asbastoa has been replaced with fibrous glass. To data, observation of fibrous glass exposed workers, soma for as long as thirty years, has not demonstrated chronic advara* pulmonary effects from axpoaura to fibrous glass. from an occupational health standpoint tha naw aabaitoa-frea glass reinforced product provides a subatantial Improvement in the quality of tha working environment as a result of tha reaoval of asbastoa from tha product. JLK:agn Jan L. Koran , H. D. 02 418 0059