Document zdxYJrM5pM1oGOawKoLRODdn0

j~:`j>- TUfe THRESHOLD UMIT VALUES and BIOLOGICAL EXPOSURE INDICES for 1987-1988 Hi-]- - *j American Conference ) of Governmental Industrial Hygienists Ijw I-V . ---y C 000180 CBY 3102521 "* : yterf..>**<>**, vA'-'; ` -V -<i LAM022090 OUSTS In this edition of the TLV list, dusts are also listed in the main alphabetical listing. Starting with the 1988-1989 edition, dusts will be listed in the main alphabetical list ing only. Substance TLV-TWA SILICA, SiO? Crystalline Quartz*1'1* [14808-60-7] Cnstobalite1'' . [14464-46-1] Silica, fused1" [60676-86-0] Tridymite1" . . (15468-32-3) Tripoli1". . [1317-95-9] 0.1 mg/m5, Respirable dust 0.05 mg/m5. Respirable dust 0.1 mg/m5. Respirable dust 0 05 mg/m3. Respirable dust 0.1 mg/m3 of contained respirable quartz dust. Amorphous Diatomaceous earth (uncalcined)' . [68855-54-9] Precipitated silica'*' Silica gei1*1, JO mg/m3. Total dust 10 mg/m3. Total dust 10 mg/m3. Total dust SILCATES Asbestos' Amosite ...................... 0.5 fiber/cc, A1 [12172-73-51 Chrysolite 2 fibers/cc, At [12001-29-51 Crocidolite................. 0.2 fiber/cc, AI [12001-28-4] Other forms.................2 fibers/cc. A) Mica'" |12001-25-2] 3 mg/m5, Respirable dust Mineral wool fiber . Perlite"' ... 10 mg/m3 10 mg/m5. Total dust Portland cement"' Soapstone . 10 mg/m5, Total dust 3 mg/m3. Respirable dust1" 6 mg/m3, Total dust1'1 Talc (containing no asbestos fibers)1" (14807-96-61 . Talc (containing asbestos fibers) 2 mg/m3, *Respirable dust Use asbestos TLV-TWA. However, should not exceed 2 mg/m3 respir able dust. 38 OTHER DUSTS Barium sulfate1'1 [7727-43-7].................. 10 mg/m5. Total dust 'Coal dust'll......................2 mg/m5. Respirable fraction Grain dust (oats. wheat, barley).............. 4 mg/m5. Total particulate t Graphite'" (natural) [7782-42-5]...................(2.5 mg/m3. Respirable dust) tGraphite, synthetic' ... (10 mg/m3. Total dust) Nuisance particulates' (see Appendix D)........ 10 mg/m5. Total dust t See Notice of Intended Changes 1987-1988 Adoption. |d) Fibers longer than 5 iun and with an aspect ratio equal to or greater than 3:1 as determined by the membrane filter method at 400-450X magnification (4 mm objective) phase contrast illumination (e) The value is for total dust containing no asbestos and < 1 % tree silica. (I) The value is lor dust containing <5% free silica. For dust containing more than this percentage ol Iree silica. Ihe environment should be evaluated against the TLV-TWA of 0 1 mg/m5 for respirable quartz The concentration ot respirable dust for the application ol this limit is to be determined from the traction passing a size-selector with the charactenstics defined in the "c " paragraphs of Appendix F. (i) The concentration of respirable dust for the application ol this limit is to be determined from the fraction passing a size-selector with the characteristics defined in the "c." paragraphs in Appendix F. 39 . CBY 3102522 . ^ 4 c oooist LAM022091