1. The activities or operations where the workers are exposed to the chemical agents shall be considered unhealthy when the tolerance limits in Table 1 of this Annex are exceeded.
2. All values given in Table 1 (Table of Tolerance Limits) are only for the absorption through inhalation.
3. All values given in Table 1 as “simple asphyxiant” determine that, in the presence of these substances in the work environment, the minimum concentration of oxygen must be 18% by volume. The activities and operations in which the oxygen concentration is below, this value shall be considered as an imminent and serious risk.
4. The chemical agents whose tolerance limits cannot be exceeded at any time during the working day are marked in the “Ceiling Limit” column.
5. The chemical agents that can be absorbed through the skin and therefore requiring the use of gloves while handling, in addition to necessary PPE for protection of other body parts, are shown in the “Absorption through skin” column.
6. The evaluation of concentrations of the chemical agents through the methods of instant sampling shall be carried out at least by 10 samples for each point – at the respiratory level of the worker. There shall be an interval of at least 20 minutes between each sample.
7. Each of the concentrations measured in these samples shall not exceed the values obtained in the equation below, otherwise being considered as imminent and serious risk.
Maximum value = L.T. x F. D.
where:
L.T. = tolerance limit for the chemical agent, according to Table 1.
F.D. = deviation factor, as stipulated in Table 2.
TABLE 2
| L.T. | F.D. | ||
| (pp, 0 1 10 100 above |
Or to to to to from |
Mg/m3) 1 10 100 1000 1000 |
3 2 1,5 1,25 1,1 |
8. When the arithmetic mean of the concentrations exceed the values in Table 1, the tolerance limit shall be considered as exceeded.
9. For the chemicals that have “Ceiling Limit” indicated in Table 1, the tolerance limit shall be considered as exceeded, when any of the concentrations obtained in the samples exceeds the values in the same table.
10. The tolerance limits in Table 1 are valid for working hours up to 48 hours per week.
10.1 For working hours that exceed 48 hours per week, it shall be duty to comply with article 60 of the CLT.
Table 1 – Table of Tolerance Limits
| CHEMICAL AGENTS | Ceiling Limit | Absoroption through skin | Up to 48 hours per week | Unhealthiness degree to be considered in characterization | ||
| ppm* | mg/m3** | |||||
| Acetaldehyde | 78 | 140 | maximum | |||
| Cellosolve acetate | + | 78 | 420 | medium | ||
| Ethylene glycol monoethyl ether acetate (see Cellosolve acetate) | – | – | – | |||
| Ethyl acetate | 310 | 1090 | minimum | |||
| Ethyl 2-ethoxy ethyl (see Cellosolve ethyl) | – | – | – | |||
| Acetylene | Asphyxiant | simple | – | |||
| Acetone | 780 | 1870 | minimum | |||
| Acetonitrile | 30 | 55 | maximum | |||
| Acetic acid | 8 | 20 | medium | |||
| Hydrogen cyanide | + | 8 | 9 | maximum | ||
| Hydrochloric acid | + | 4 | 5,5 | maximum | ||
| Chromic acid (mist) | – | 0,04 | maximum | |||
| Ethanoic acid (see Acetic acid) | – | – | – | |||
| Hydrofluoric acid | 2,5 | 1,5 | maximum | |||
| Formic acid | 4 | 7 | medium | |||
| Methanoic acid (see Formic acid) | – | – | – | |||
| Methyl acrylate | + | 8 | 27 | maximum | ||
| Acrylonitrile | + | 16 | 35 | maximum | ||
| Iso-amyl alcohol | 78 | 280 | minimum | |||
| N-Butyl alcohol | + | + | 40 | 115 | maximum | |
| Isobutyl alcohol | 40 | 115 | medium | |||
| Sec-butyl alcohol (2-butanol) | 115 | 350 | medium | |||
| Tert-butyl alcohol | 78 | 235 | medium | |||
| Ethyl alcohol | 780 | 1480 | minimum | |||
| Furfuryl alcohol | + | 4 | 15,5 | medium | ||
| Methyl amyl alcohol (see Methyl isobutyl carbinol) | – | – | – | |||
| Methyl alcohol | + | 156 | 200 | maximum | ||
| N-Propyl alcohol | + | 156 | 390 | medium | ||
| Isopropyl alcohol | + | 310 | 765 | medium | ||
| Acetic aldehyde (see Acetaldehyde) | – | – | – | |||
| Formic aldehyde (see Formaldehyde) | – | – | – | |||
| Ammonia | 20 | 14 | medium | |||
| Anhydrous sulfur (see Sulfur dioxide) | – | – | – | |||
| Aniline | + | 4 | 15 | maximum | ||
| Argon | Asphyxiant | simple | – | |||
| Arsine | 0,04 | 0,16 | maximum | |||
| Benzene | (Excluded by Ordinance No.03, on March 10th, 1994) | |||||
| Ethyl bromide | 156 | 695 | maximum | |||
| Methyl bromide | + | 12 | 47 | maximum | ||
| Bromine | 0,08 | 0,6 | maximum | |||
| Bromoethane (see Ethyl bromide) | – | – | – | |||
| Bromoform | + | 0,4 | 4 | medium | ||
| Bromomethane (see Methyl bromide) | – | – | – | |||
| 1,3 Butadiene | 780 | 1720 | medium | |||
| n-Butane | 470 | 1090 | medium | |||
| n-Butane (see N-butyl alcohol) | – | – | – | |||
| sec-Butanol (see Sec-butyl alcohol) | – | – | – | |||
| Butanone (see Methyl ethyl ketone) | – | – | – | |||
| 1-Butanethiol (see Butyl mercaptan) | – | – | – | |||
| n-Butylamine | + | + | 4 | 12 | maximum | |
| Cellosolve butyl | + | 39 | 190 | medium | ||
| n-Butil mercaptana | 0,4 | 1,2 | medium | |||
| 2-Butoxyethanol (see Cellosolve butyl) | – | – | – | |||
| Cellosolve (see 2-ethoxy ethanol) | – | – | – | |||
| Lead | – | 0,1 | maximum | |||
| Methyl cyanide (see Acetonitrile) | – | – | – | |||
| Vinyl cyanide (see Acrylonitrile) | – | – | – | |||
| Cyanogen | 8 | 16 | maximum | |||
| Cyclohexane | 235 | 820 | medium | |||
| Cyclohexanol | 40 | 160 | maximum | |||
| Cyclohexylamine | + | 8 | 32 | maximum | ||
| Carbonyl chloride (see Phosgene) | – | – | – | |||
| Ethyl chloride | 780 | 2030 | medium | |||
| Phenyl chloride (see Chloro benzene) | – | – | – | |||
| Methyl chloride | 78 | 165 | maximum | |||
| Methylene chloride | 156 | 560 | maximum | |||
| Vinyl chloride | + | 156 | 398 | maximum | ||
| Vinylidene chloride | 8 | 31 | maximum | |||
| Chlorine | 0,8 | 2,3 | maximum | |||
| Chlorobenzene | 59 | 275 | medium | |||
| Clorobromomethane | 156 | 820 | maximum | |||
| Chloroethane (see Ethyl chloride) | – | – | – | |||
| Chloroethyl (see Vinyl chloride) | – | – | – | |||
| Chlorodifluomethane (Freon 22) |
780 | 2730 | minimum | |||
| Chloroform | 20 | 94 | maximum | |||
| 1-chloro-1-nitropropane | 16 | 78 | maximum | |||
| Chloroprene | + | 20 | 70 | maximum | ||
| Cumene | + | 39 | 190 | maximum | ||
| Decaborane | + | 0,04 | 0,25 | maximum | ||
| Demeton | + | 0,008 | 0,08 | maximum | ||
| Diamine (see Hydrazine) | – | – | – | |||
| Diborane | 0,08 | 0,08 | maximum | |||
| 1,2-Dibramoetano | + | 16 | 110 | medium | ||
| o-Dichlorobenzene | 39 | 235 | maximum | |||
| Dichlorodifluoromethane (Freon 12) | + | 780 | 3860 | minimum | ||
| 1,1 Dichloroethane | 156 | 640 | medium | |||
| 1,2 Dichloroethane | 39 | 156 | maximum | |||
| 1,1 Dichloroethylene (see Vinylidene chloride) |
– | – | – | |||
| 1,2 Dichloroethylene | 155 | 615 | medium | |||
| Dichloromethane (see Methyl chloride) | – | – | – | |||
| 1,1 Dichloro-1-nitroethane | + | 8 | 47 | maximum | ||
| 1.2 Dichloropropane | 59 | 275 | maximum | |||
| Dichlorotetrafluoroethane (Freon 114) | 780 | 5460 | minimum | |||
| Diethylamine | 20 | 59 | medium | |||
| Diethyl ether (see Ethyl ether) | – | – | – | |||
| 2,4 Toluene diisocyanate (TDI) | + | 0,016 | 0,11 | maximum | ||
| Diisopropylamine | + | 4 | 16 | maximum | ||
| Dimethylacetamide | + | 8 | 28 | maximum | ||
| Dimethylamine | 8 | 14 | medium | |||
| Dimethylformamide | 8 | 24 | medium | |||
| l, l Dimethyl hydrazine | + | 0,4 | 0,8 | maximum | ||
| Carbon dioxide | 3900 | 7020 | minimum | |||
| Chlorine dioxide | 0,08 | 0,25 | maximum | |||
| Sulphur dioxide | 4 | 10 | maximum | |||
| Nitrogen dioxide | + | 4 | 7 | maximum | ||
| Carbon disulfide | + | 16 | 47 | maximum | ||
| Stibnite | 0,08 | 0,4 | maximum | |||
| Styrene | 78 | 328 | medium | |||
| Ethanol (see Acetaldehyde) | _ | _ | _ | |||
| Ethane | Asphyxiant | simples | _ | |||
| Ethanol (see Ethyl) | _ | _ | _ | |||
| Ethanethiol (see Ethyl mercaptan) | _ | _ | _ | |||
| Dichloroethyl ether | + | 4 | 24 | maximum | ||
| Ethyl ether | 310 | 940 | medium | |||
| Ethylene glycol monobutyl ether (see Cellosolve buthyl) |
_ | _ | _ | |||
| Ethylene glycol monoethyl ether (see Cellosolve) | _ | _ | _ | |||
| Ethylene glycol monomethyl ether (see Cellosolve methyl) | _ | _ | _ | |||
| Ethylamine | 8 | 14 | maximum | |||
| Ethylbenzene | 78 | 340 | medium | |||
| Ethylene | Asphyxiant | simples | _ | |||
| Ethyleneimine | + | 0,4 | 0,8 | maximum | ||
| Ethyl mercaptan | 0,4 | 0,8 | medium | |||
| n-Ethyl morpholine | + | 16 | 74 | medium | ||
| 2-Ethoxyethanol | + | 78 | 290 | medium | ||
| Phenol | + | 4 | 15 | maximum | ||
| Fluorotrichloromethane (Freon 11) |
780 | 4370 | medium | |||
| Formaldehyde (formalin) | + | 1,6 | 2,3 | maximum | ||
| Phosphine | 0,23 | 0,3 | maximum | |||
| Fosgênio | 0,08 | 0,3 | maximum | |||
| Freon 11 (see Fluortrichloromethano) | _ | _ | _ | |||
| Freon 12 (see Dichlorodifluoromethane) | _ | _ | _ | |||
| Freon 22 (see Chlorodifluoromethane) | _ | _ | _ | |||
| Freon 113 (see 1,1,2, 1,2,2-trichlorotrifluoroethane) | _ | _ | _ | |||
| Freon 114 (see Dichlrorotetrafluorethane) | _ | _ | _ | |||
| Ammonia gas (see Ammonia) |
_ | _ | _ | |||
| Carbonic gas (see Carbon dioxide) | _ | _ | _ | |||
| Hydrocyanic gas (see Hydrocyanic acid) |
_ | _ | _ | |||
| Chlorine gas (see Hydrochloric acid) | _ | _ | _ | |||
| Sulfide gas | 8 | 12 | maximum | |||
| Helium | Asphyxiant | simples | _ | |||
| Hydrazine | + | 0,08 | 0,08 | maximum | ||
| Antimony hydride antimony (see Stibnite) | _ | _ | _ | |||
| Hydrogen | Asphyxiant | simples | _ | |||
| Isobutanol (see Isobutyl alcohol) | _ | _ | _ | |||
| Isopropylamine | 4 | 9,5 | medium | |||
| Isopropyl benzene (see Cumene) | _ | _ | _ | |||
| Mercury (all except organic forms) | _ | 0,04 | maximum | |||
| Methyl methacrylate | 78 | 320 | minimum | |||
| Methane | Asphyxiant | simples | _ | |||
| Methanol (see Methyl alcohol) | _ | _ | _ | |||
| Methylamine | 8 | 9,5 | maximum | |||
| Cellosolve methyl | + | 20 | 60 | maximum | ||
| Methyl cyclohexanol | 39 | 180 | medium | |||
| Methyl chloroform | 275 | 1480 | medium | |||
| Methyl demeton | + | _ | 0,4 | maximum | ||
| Methyl ethyl ketone | 155 | 460 | medium | |||
| Methyl isobutylcarbinol | + | 20 | 78 | maximum | ||
| Methyl mercaptan (methanethiol) | 0,04 | 0,8 | medium | |||
| 2-Methoxy ethanol (see Cellosolve methyl) | _ | _ | _ | |||
| Monomethyl hydrazine | + | + | 0,16 | 0,27 | maximum | |
| Carbon monoxide | 39 | 43 | maximum | |||
| Carbon black (1) | 3,5 | maximum | ||||
| Neon | Asphyxiant | simples | _ | |||
| Nickel carbonyl (Nickel tetracarbonyl) | 0,04 | 0,28 | maximum | |||
| N-propyl nitrate | 20 | 85 | maximum | |||
| Nitroethane | 78 | 245 | medium | |||
| Nitromethane | 78 | 195 | maximum | |||
| 1 – Nitropropane | 20 | 70 | medium | |||
| 2 – Nitropropane | 20 | 70 | medium | |||
| Ethylene oxide | 39 | 70 | maximo | |||
| Nitric oxide (NO) | 20 | 23 | maximum | |||
| Nitrous oxide (N2O) | Asphyxiant | simples | – | |||
| Ozone | 0,08 | 0,16 | maximum | |||
| Pentaborane | 0,004 | 0,008 | maximum | |||
| n-Pentane | + | 470 | 1400 | minimum | ||
| Perchloroethylene | 78 | 525 | medium | |||
| Pyridine | 4 | 12 | medium | |||
| n-Propane | Asphyxiant | simples | – | |||
| n-Propanol (see n-Propyl alcohol) | – | – | – | |||
| iso-Propanol (see Isopropyl alcohol) | – | – | – | |||
| Propanone (see Acetone) | – | – | – | |||
| Propylene | Asphyxiant | simples | – | |||
| Propylene imine | + | 1,6 | 4 | maximum | ||
| Dimethyl sulphate | + | + | 0,08 | 0,4 | maximum | |
| Hydrogene sulphide (see Sulfhydric gas) | – | – | – | |||
| Systox (see Demeton) | – | – | – | |||
| 1,1,2,2,Tetrabromoethane | 0,8 | 11 | medium | |||
| Carbon tetrachloride | + | 8 | 50 | maximum | ||
| Tetrachloroethane | + | 4 | 27 | maximum | ||
| Tetrachloroethylene (see Perchloroethylene) | – | – | – | |||
| Tetrahydrofuran | 156 | 460 | maximum | |||
| Toluene | + | 78 | 290 | medium | ||
| Tolueno-2,4-diisocyanate (TDI) (see 2,4 toluene diisocyanate) | – | – | – | |||
| Tribromomethane (see Bromoform) | – | – | – | |||
| Vinyl trichloride (see 1,1,2 trichloroethane) | – | – | – | |||
| 1,1,1 Trichloroethane (see Methyl chloroform) | – | – | – | |||
| 1,1,2 Trichloroethane | + | 8 | 35 | medium | ||
| Trichloroethylene | 78 | 420 | maximum | |||
| Trichloromethane (see Chloroform) | – | – | – | |||
| 1,2,3 Trichloropropane | 40 | 235 | maximum | |||
| 1,1,2 Trichloro-1,2,2 trifluoroethane (Freon 113) | 780 | 5930 | medium | |||
| Triethylamine | 20 | 78 | maximum | |||
| Trifluoro monobromo methane |
780 | 4760 | medium | |||
| Vinyl benzene (see Sytrene) | – | – | – | |||
| Xylene (Xylol) | 78 | 340 | medium | |||
