Document g2vGxBxq2LXdmr6nv221pywDN

158 CHAPTER 8 1952 Guide ' Table 3. Maximum Allowable Concentration op Gases and Vapors ASA STAND- Threshold Limit Values A.C.GJ.H.* 1951 SUBSTANCE ppm by volume. ppm Gm/cu m or ' Oz/1000 cu Oz/1000 cu ft Acetaldehyde................... ................... . Acetic acids................................... ................ Acetic anhydride........................................... -Acetone................... ..................................... Acrolein............................. ............................. Acrylonitrile.................................................. Ammonia....................................................... Amyl acetate.................................................. iso-Amyl alcohol........... ............................ Aniline............................................................ Arsine.............................................................. Benzene (benzol)........................................... Bromine.......................................................... 1,3-Butadiene................................. .............. n-Butanol................................. :................. 2-Butanone.................................. ........... n-Butyl acetate............................................. Butyl `'cellosolve"....................................... Carbon dioxide.............................................. Carbon disulfide................. ......................... Carbon monoxide......................................... Carbon tetrachloride................................... "Cellosolve".................................................. * 'Cellosolve" acetate.................................... Chlorine.......................................................... 2-Chlorobutadiene..................................... Chloroform..................................................... 1-Chloro-l-nitropropane.......................... Cyclohexane. ......................................... ....... Cyclohexanol............................. ................. Cyclohexanone.............................................. Cyclohexene................................................... Cyclopropane (propene).............................. o-Dichlorobensene........................................ Dichlorodifluoromethane.......... ............ 1.1-Dichloroethane.................... ;*: 1.2-Dichloroethane (ethylene dichlonde) 1.2-Dichloroethylene................................ Dichloroethyi ether..................................... Dichloromethane...................................... Dichloromonofluormethane..................... 1.1-Dichloro-l-nitroethane........... 1.2-Dichloropropane (propylene dichlo ride)......................... ................................... Dichlorotetrafluoroethane........................ Dimethylaniline........................................... Dimethylsulfate..................................... Dioxane............................. .......................... Ethyl acetate....................... ...................... Ethyl alcohol................................................. Ethyl benzene............................................... Ethyl bromide.............................................. Ethyl chloride. ... ..................................... Ethylene chlorhydrin................. ................ Ethylene oxide.............................................. Ethyl ether.................................................... Ethyl formate................................................ Ethyl silicate.................................................. Formaldehyde............................................... Gasoline.......................................................... Heptane.......................................................... Hexane............ ............................................. Hydrogen chloride....................................... Hydrogen cyanide........................................ Hydrogen fluoride........................................ 100 20 100 10 200 10 5 500 0.5 20 100 200 100 5 0.05 35 1 1000 50 250 200 200 5000 20 100 50 200 100 1 25 100 20 400 100 100 400 400 50 1000 100 75 200 15 500 1000 10 75 1000 6 1 100 400 1000 200 200 1000 5 100 400 100 100 5 500 500 500 6 10 3 0.36 0.02554 0.02085 1.2065 0.1145 0.04336 1.064 0.36 0.019 0.11393 0.00653 2.210 0.1515 0.735 0.948 0.966 0.0622 0.313 0.736 0.54 0.0905 0.488 0.101 1.375 , 0.409 0.401 1.34 0:6875 0.3005 4.94 0.405 0.3038 0.794 0.0878 1.74 4.20 0.0589 0.3265 6.98 6.02475 0.00515 0.36 1.44 1.881 0.868 0.892 2.64 0.01645 0.18 1.212 0.303 0.851 0.006135 2.045 2.05 1.76 0.00746 0.01104 0.00245 0.43 0:02 0.02 1.21 . 0.013 0.05 1.16 0.41 0.02 0.12 0.03 3.3 0.18 0.88 1.04 1.02 0.05 0.19 0.76 0.53 0.09 0.31 0.08 1.69 0.42 0.41 1.58 0.91 0.24 3.18 0.33 0.23 0.59 0.08 1.25 2.83 0.4 0.29 4.36 0.02 0.003 0.33 1.52 2.2 0.96 ' 0.59 2.75 0.015 0.09 1.67 0.315 0.87 2.89 2.87 2.54 0.004 0.015 0.003 Air Contaminants 159 Table 3. Maximum Allowable Concentration of Gases and Vapors (Concluded) SUBSTANCE ASA Stand ards MAC. ' ppm by volume Thbesbold Limit Values A.C.(7J.H.a=1951 : ppm Gm/cu m or O1/1000 cu ftb: Oz/1000 cu ft Mesityl oxide................................................. 20 . 200. 100 Mononitrotoluene.......................................... Nitrogen oxides (other than nitrous ox- 25 1,1,2,2-Tetrachloroethane...................... 400 200 200 200 0.05 20 25 .200 200 20 100 25 . 25 100 500 100 100 100 100 75 1000 5 , 200 500 1 100 25 0.5 100 50 500 1 1000 200 1 0.05 0.5 400 200 500 0.1 500 200 1 10 5 , 100 200 100 100 500 200 0.1208 nU.'jWrafl A OKCJ 0 400 0A465 5.61 0.638 1.945 0.307 _ .. . 0.182 r94 0.704 0.00281 0.834 2.085 2.845 0.85 0.343 0.679 0.752 0.0219 0.536 0.556 1.28 0.868 ; 0 1C ^ ' n*ni Oil 2.44 .0.48 ' 0.25 0.49 0.71 2.6 0.006 0.004 0.275 0.003 4.5 0.82 0.0018 0.885 2.75 U.IHU 0.02 0.405 0.83 vA.C.G.I.H. = American Conference of Governmental Industrial Hygienists. 0 Liquid ounces .(at 20 C) of chemical in 1000 cu ft. apply a reasonable safety factor to the ventilation estimate without con sideration of the concentrations of gases or vapors that approach the danger Point. Safety engineers prefer to limit the concentration to ^ or | of the lower explosive limit, and this fact should be given full weight in determinmg the capacity and design of ventilating equipment. Rarely should