Document 4aqaBbDKKEw64aVgG4eerjaMV

ELEMENTS OF INDUSTRIAL TOXICOLOGY TABLE 40-B. THRESHOLD LIMIT VALUES FOR 1963 (Continued) Mineral Dusts, Tentative Values, and Appendix A Mlnerol Posts Sobstence mppcfi MUCA Crystalline Quartz, Threshold Limit calcu- 250 toted from the formula %Siot + 5 Cnstobalite " " Amorphous, including Ratvirol dtatomaceous earth 20 SILICATES (less than 1% crystalline silica) Asbestos . .. Mica Soapstone . Talc Portland Cement 5 20 20 20 50 MisceOeBeoits (less than ) % crystalline silico) 50 Ccmromon factors mppcf X 35 3 = million particles per cubic meter =: particles per c c- Tentative Values Sabstence C tevt Butyl chromate (os CrOs)--Skin Calcium oxide Camphor..................... Copper Fume .... Dusts & Mists DDVP (O.O-Dtmethyt- 2,2-didilom ppn -- -- -- -- -- ag/cu ro 01 5 2 01 10 Tentative Values Substance Oemefon (ft) (SysfoxJ Endrtn (1,2,3.4,10, 10,-hexochloro-6, 7-epoxy* 1,4,4o, 5.6.7.8.80-octa hydro 1.4-endo-5, 8-dtmetHanonapthalene--Skm Epichlorhydrin Ethanolamme Graphite Hafnium Heprtochlor 11,4,5.6, 7.5.80-heptoch1oro3a, 4,7,7o-tetrahydro-4,7-methanoindene) .. Methylamme Methyl Methacrylate C Methylene bts phenylisocyanato Mineral Wool (Fiberglas) . Naptholene Oil (mineral) .. g^Proproloctcne ppm* 25 100 0*02 10 Tantalum 1,1,1,2,-Tetrachloro- 2^,-difluoroethane 1,1 jJ-Tetrachkuo* I ,2-difluoroethane Tetraethyl lead--Skin Tin (inorganic compounds) . (organic compounds as Sn--Skm........... 1000 500 mg/cu 0I 01 19 6 15 mppcf 05 05 31 410 02 2 50 S A-5 005 5 8340 4170 0075 2 01 Nora The word `Skin" following a substance indicates that the substance can penetrate the etas to contribute to the exposure end TLV should be reduced accordingly Parts of vapor or gas per million parts of air by volume at 25 C and 760 mm Hg pressure. Approximate mg of particulate per nmol air fiMiHions of particles per cn ft of air, based on impinger samples counted by light-field teehmca. TThe percentage of crystalline silica in the formula is the amount determined from airborne samples, except in those instances m which other methods have been shown to be applicable. A numbers, see specific number in Appendix A C substances, see Appendix C Appendix A A* I Beoxldlne Because of high incidence of bladder tumors in man, any exposure, including skm, is extremely hazardous A-2 p-Hopbtbylomlne Become of the ex tremely high incidence of Madder tu mors m workers handling this compound, and the mobility to control exposures. B-nophthylamrne has been prohibited from manufacture, use ond other activi ties that involve human contact by the State of Pennsylvania A-3 N-NitrosodimeHiylombie Because of ex tremely high toxicity end presumed car cinogenic potential of this compound, contoct by any route*should not be per mitted A-4 Teflon decomposition products At least one identified component of Teflon de composition products is extremely toxic, but in the absence of more complete foxicrty information and suitable analy tic methods, o definite threshold limit value is not recommended at this time, but oir concentrations should be minimal A-5 ft-Proplotoctone Becouse of high acute toxicity and demonstrated skin tumor production in animals, contact by any route should be avoided. 40S