Document gaJqJ029j01MMp5MaLE240DE3

X SjAt ? TUfe THRESHOLD LIMIT VALUES and BIOLOGICAL EXPOSURE INDICES for 1986-1987 PLAINTIFF'S EXHIBIT ifi f % $ ^ W5P American Conference of Governmental Industrial Hygienists * CBY 3102519 C 00017S'* '//V LAM022088 Substance OUSTS TLV-TWA s/l/ca, SO; Crystalline Quartz*'" [14808-60-7]................ 0.1 mg/m3, Respirable dusl Cristobalite.................... 0.05 mg/m3, Respirable dust [14464-46-1] Silica, (used [60676-86-0]................ 0.1 mg/m3. Respirable dust ' Tridymite...................... 0.05 mg/m3, Respirable dust [15468-32-3] Tripoli ............................. 0.1 mg/3 of contained respirable [1317-95-9] quartz dust. Amorphous Diatomaceous earth (uncalcined)*"............... 10 mg/m3. Total dust [68855-54-9J t Precipitated silica...........(5mg/m3, Respirable dust) 10 mg/m3, Total dust f Silica gel......................... (5 mg/m3. Respirable dust) 10 mg/mJ, Total dust SILCA TES" Asbestos"3 Amosite .......................0.5 fiber/cc,141 Ala [12172-73-5] Chrysolite.....................2 fibers/cc,*41 Ala [12001-29-5] Crocidolite.....................0.2 fiber/cc,'41 Ala [12001-28-4] Other forms .................2 fibers/cc,*41 Ala tGraphite (natural)............2.5 mg/m3. Respirable dust [7782-42-51 (5 mg/m3. Total dust) "Mica [12001-25-2] ...........3 mg/m3, Respirable dust Mineral wool fiber...........10 mg/m3 "Perlite................................10 mg/m3, Total dust Portland cement...............10 mg/m3, Total dust Soapstone ....................... 3 mg/m3. Respirable dust 6 mg/m3, Total dust Talc (containing no asbestos fibers) [14807-96-6]................2 mg/m3, Respirable dust Talc (containing asbestos fibers) Use asbestos TLV-TWA. However. should not exceed 2 mg/m3 respir able dust. 34 F MUM tpt tju i. OTHER DUSTS "Barium sulfate [7727-43-7]................... 10 mg/m3, Total dusl "Grain dust (oats, wheat, barley)...............4 mg/m3. Total particulate "Graphite, synthetic ........ 10 mg/m3. Total dust `Nuisance particulates (see Appendix D)........ 10 mg/m3. Total dust tCOAL DUST t (2 mg/m3 (respirable dust fraction <5% quartz). If > 5% quartz, use respirable quartz value. FOOTNOTES FOR OUSTS (h) Both concentration and percent quartz (if applicable) for respirable dust for the application of this limit are to be deter mined from the fraction passing a size-selector with the charac teristics defined in Appendix F. (i) For silicates, the values are for dust containing no asbestos and < 1 % crystalline silica in the total dust. For coal dust, the value is for coal dust containing <5% crystalline silica in the respirable fraction. For materials containing more than these percentages of crystalline silica, the environment should be evaluated against the TLV-TWA of 0.1 mg/m3 for respirable quartz. Even where the respirable quartz concentration is less than 0.1 mg/m3, the level of the major component should not exceed its TLV, (j) As determined by the membrane filter method at 400-450 x magnification (4 mm objective) phase contrast illumination. (k) Fibers longer than 5 pm and with an aspect ratio equal to or greater than 3:1. 35 car 3102520 C 000179 LAM022089