Document JNLnzxyo4NMkOd9gJnryLo39v

Suhstar.ee: Asbestos. Standard:2 CFR ici0.<y?a(b). (l) ar.ri(3) cf June 7,1072 8-hour tirse-weighted average:5 fibers,longer than 5 micrometers,per cubic centimeter of air. Ceiling concentrat.ior.:10 fibers,longer than 5 micrometers,per cubic centimeter of air. Analytical Method: Fibers counted at 400-450 Magnification,using phase contrast illumination, with sample mounted in high-viscosity solution of membrane filter material. Sampling Equipment: . Personal sampling pump plus Killipore type AA Filter (37nn,0.8u pore size). Face cap is removed and filter used open face during sampling. Sample rate: 2 liters per minute. Sample Size: Minimum period of 15 minutes for evaluation of ceiling limit. Several samples of up to 4 hours for evaluation of E-hour average. Samples with a visible deposit may be too heary to count. Compare with a clean filter. Heavy concentraticr of visible dust in the air (1C0-5C0 fibers/cc) may require short sampling periods c:' only 5 minutes,or less. Blanks: . With each batch of samples submit two filters which are subjected to exactly the same handling as for the samples except .that r.o air is-drawn through them. Lqbel these as blanks. Shipping: The cassettes in which the samples are collected should be shipped in a suitable container,designated to prevent damage in transit. Formula used for Limits: CT+CT+CT E= 11 2 2 nn 8 E=equivalent exposure for the 8-hour work-shift. C2=fiber concentration for the period Tj_ T=time in hours at concentration C^ n -- a series of nunnbered samples and exposure times. ' rva,r* ARCH 019974 TV.lfT TTTi 3 FI71"? r Long Tern Effects Promote ASBESTOSIS And Probability Of Cancer Long Term Effects `Promote Probability Of G.I. Cancer >- V *#T -S' V ARCH 019975 Kl O tXu r lrOu I O uT tHi MC Vi co I . N C H 338*11 *** ARCH 019976 51 i-n MICRONS ^ ipi p> >< a P U O 55 g UPs B 19A9 I t s 99,9 999? ARCH 019977