Document X7RR8n9JdjG7kQwjOnK6Rgm2x

Threshold Limit Values For 1962 Adopted at the 24th Annua! Meeting of the American Conference of Governmental Industrial Hygienists, Washington, D.C, May 13-15, 1962. 6113 18466 B0CG217 LAM021609 Substance 'Warfarin (3-1 rracetonylbenzyl ] 4- hydroxycoumarm) Vttrium Xylene (xylol) ..................... Xylidine -- Skin .... 'Zinc oxide fume ....................... Zirconium compounds (as Zr) ppmt -- -- 200 5 -- -- Ml/*5* 01 5 870 25 5 5 Miscellaneous (less than 1% crystalline silica) ......... 50 Note: The percent of crystalline silica In tne abort formula and tables is based on the amount found from an analysis of the air-borne dust. Conversion factors mppcf x 35.3 = million particles per cubic meter = particles per c.c. Radioactivity: For permissible concentrations of radioisotopes in air, see U. S. Department of Million* of partldat per cubic foot of air. baaed on the standard procedure for samplinf and cauntlnc dusta adopted by the Fifth Annual Meetlnf of ACGIH (1942). Commerce, National Bureau of Standards, Hand '1962 Revision book 69, "Maximum Permissible Body Burdens and Maximum Permissible Concentrations of TENTATIVE VALUES Radionuclides in Air and in Water for Occupa tional Exposure". June 5, 1959. Also, see U. S. Sobstaace AppfM. M(. PPt par C*. M.* Department of Commerce, National Bureau of Standards, Handbook 59, "Permissible Dose from External Sources of Ionizing Radiation", Septem 'Benzidine .................................. tert. Butyl chromate (asCrO,)..... 'Camphor ............... -- -- -- A1 0.1 5 ber 24, 1954, and addendum of April 15, 1958, Chlorobromomethane .................... Cobalt .................................. 200 -- 1.050 0.5 *1962 Revision t Rani of yapdr or |u par million pom of air by roluma it 2S*C and 760 mm. H( praitura. t Approximate mllllirama of poniculato por cubic motor of air. DDVP (0. O-Oimethyl-2, 2dichlorovinyl phosphate) ........ Dimethyl acetamide -- Skin....... Endrin (1, 2. 3, 4. 10, 10- hexachloro-6. 7-epoxy-l, 4. 4a, -- 10 1 35 5, 6, 7, 8, 8a-octa hydro 1, 4- endo-5,8-dimethanonaphthalene) -- 0.25 MINERAL DUSTS 'Epichlorohydrin.............................. 5 19 Ethanolamine 0.5 1 Hcptachloro (1, 4, 5, 6, 7, 8, 8- Sakttaaca m.p.p.e.f.t heptachloro-3a, 4, 7, 7a-tetrahydro-4, 7-methanoindene) .... -- 0.25 'SILICA Ketene ............ .......................... .. 0.5 0.9 Crystalline *B-Naphthylamine .............. -- A1 Quartz, ThresholdLimit calculated 250 1-Nitropropane .............................. 25 90 from the formula......................... Cristobalite " Amorphous, including natural diatomaceous earth............................ %StQ, -t- 5 20 . I 1 *N-Nitrosodimethylamine (Dimethylnitrosamme) ............. 'Oil (mineral) ................................ 'Osmium tetroxide ..............--.... Pentaborane ........ ......................... A> -- -- 0.005 -- 5 0.002 0.01 *P?rchloryl fluoride ........................ 3 13.5 SILICATES (less than 1% crystalline silica) Asbestos ................................................ Mica ................ Soapstone .............. Talc ............................................................ Portland Cement.................................... 5 20 20 20 50 *1962 addition t Parts of vapor or (as par million parts of air by volume at 2S*C and 7(0 mm. Hf pressure. t Approximate mllllfrems per cubic meter of air. id 11 LAM021610 BCCG218 6113 18467