Document B8qvzKQYXyEvnz181m5yvO5xJ

PLAINTIFF'S EXHIBIT MON-2401 A f 44 uT? Threshold Limit Values of Air-borne Contaminents For 1968 RECOMMENDED AND INTENDED VALUES Adopted at the 30th Annual Meeting of the American Conference of Governmental Industrial Hygienists. St. Louis, Missouri. May 13. 1966. LAM021597 B0C3205 6113 18454 MINERAL DUSTS Sukstenc* " p. p. c. (. SILICA Crystalline Quartz, Threshold Limit calculated from the formula ........................... 250 0 teSiO a * 5 Cristobalite " " ' Amorphous, including natural diatomaceous earth. ...... TremoliU............................................ 20 5 SILICATES (less than 11* crystalline silica) * Asbestos.......................................... 5 Mica..................................................... 20 Soapstone ........................................... 20 Talc..................................................... 20 Portland Cement................................. 50 GRAPHITE (natural) .................... 15 "Inert" or Nuisance Particulates 50 (or 15 mj *> whichever is the see Appendix D smaller I Cpnvftipw fpctpr* mppct x 35.3 = million oarticles pet cubic meter = particles per c. c. ) Millions f porticles por cubic foot of oir, bated on impmger samplas counted by light- field technics. f) Tho percentage of crystalline silica in tho formula is tho onuunt dotonnmod from oir - boms samples, except in those instances in which other methods hove boon shown to be applicable. See Nocice of Intended Changes 14 NOTICE OF INTENDED CHANCES These substances, with their corresponding values, com prise those (or which either a limit has been proposed for the (irst time, oi (or which a chance in the 'Recommended" list ing has been proposed. In both cases, the proposed limits should be considered trial limits that will remain m this listing (or a period ol ai leasi two rears. Dm me this time, the previuusit Recommended Limit will remain m cllcrt. If. adci two yejrs no evidence cunms to hcht tliat questions the appropriateness of the values herein, the values will lx jilart'd m the "Recom mended' list. Documentation is available (or each ol these substances. Sukstwnc* Abate.................................................................. Boron pibromide.............................................. Bromine pentafluoride.................................... * Butyl mercaptan............................................. +C Cadmium oxide fume (as Cdi...................... Camphor............................................................. Chlorine.............................................................. Cyanogen........................................................... H-C Dtchloioacetylene.......................................... C Diethylene tnamine - Skin........................... Diphenyl amine.............................................. +v Endosulfan (Thiodan*) - 5km................... * Ethyl mercaptan.............................................. Fibrous glass.................................................... + Heptane............................................................. -- Indene ................................................................ Indium and compounds, as In....................... non salts, soluble, as Fe............................ -to Methyl isoamyl ketone................................... Methyl meicaptan............................................ C Methyl silicate.................................................. + Octane............................................................... * Oil mist (particulate)...................................... + Oil vapors......................................................... *+ Pentaetythritol (tetramethylomethane)...... t Pentane............................................................. ppm Mg M 1.0 o. 1 c. 5 2 1 10 0.1 10 - 0.5 _ 15 o. 1 10 0.1 5 500 2.000 10 0.1 -1 100 475 0.5 C_ 400 1.900 56' a6 15 500 1.500 o) Ports of vapor or go* per million ports of contaminated oir by volume at 25* C end 760 mm. Hg pressure. b) Approximate milligrams of particulate per cubic meter of oir. 1968 Revision 1968 Addition B0CS206 LAM021598 6113 18455