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Regulation 2(5)
Regulations 2(1), 7(6) and 12(2)
The maximum exposure limits of the dusts included in the list below refer to the total inhalable dust fraction, unless otherwise stated.
| Reference periods | |||||
|---|---|---|---|---|---|
| Long-term maximum exposure limit(8-hour TWA reference period) | Short-term maximum exposure limit(15-minute reference period) | ||||
| Substance | Formula | ppm | mg m−3 | ppm | mg m−3 |
* In addition to the maximum exposure limit specified above man-made mineral fibre is also subject to a maximum exposure limit of 2 fibres ml-1 8-hour TWA, when measured or calculated by a method approved by the Health and Safety Commission. | |||||
** Limit relates to cyclohexane soluble material. | |||||
*** In addition to the maximum exposure limit specified above vinyl chloride is also subject to an overriding annual exposure limit of 3 ppm.” | |||||
| Acrylamide | CH2=CHCONH2 | — | 0.3 | — | — |
| Acrylonitrile | CH2=CHCN | 2 | 4.4 | — | — |
| Antimony & antimony compounds except stibine (as Sb) | Sb | — | 0.5 | — | — |
| Arsenic & compounds except arsine (as As) | As | — | 0.1 | — | — |
| Azodicarbonamide | C2H4N4O2 | — | 1.0 | — | 3.0 |
| Benzene | C6H6 | 5 | 16 | — | — |
| Beryllium and beryllium compounds (as Be) | Be | — | 0.002 | — | — |
| Bis(chloromethyl) ether | ClCH2OCH2C1 | 0.001 | 0.005 | — | — |
| Buta-1, 3-diene | CH2=CHCH=CH2 | 10 | 22 | — | — |
| Cadmium & cadmium compounds, exceptcadmium oxide fume,cadmium sulphide andcadmium sulphidepigments (as Cd) | Cd | — | 0.025 | — | — |
| Cadmium oxide fume(as Cd) | CdO | — | 0.025 | — | 0.05 |
| Cadmium sulphide andcadmium sulphidepigments (respirabledust as Cd) | CdS | — | 0.03 | — | — |
| Carbon disulphide | CS2 | 10 | 32 | — | — |
| 1-Chloro-2,3-epoxypropane (Epichlorohydrin) | OCH2-CH-CH2Cl | 0.5 | 1.9 | 1.5 | 5.8 |
| Chromium (VI) compounds (as Cr) | Cr | — | 0.05 | — | — |
| Cobalt and cobalt compounds (as Co) | Co | – | 0.1 | — | — |
| Cotton dust | — | 2.5 | — | — | |
| 1,2-Dibromoethane (Ethylene dibromide) | BrCH2CH2Br | 0.5 | 3.9 | — | — |
| 1,2-Dichloroethane (Ethylene dichloride) | ClCH2CH2Cl | 5 | 21 | — | — |
| Dichloromethane | CH2Cl2 | 100 | 350 | 300 | 1060 |
| 2,2'-Dichloro-4,4' -methylene dianiline (MbOCA) | CH2(C6H3ClNH2)2 | — | 0.005 | — | — |
| Diethyl sulphate | C4H10O4S | 0.05 | 0.32 | — | — |
| Dimethyl sulphate | C2H6O4S | 0.05 | 0.26 | — | — |
| 2-Ethoxyethanol | C2H5OCH2CH2OH | 10 | 37 | — | — |
| 2-Ethoxyethyl acetate | C2H5OCH2CH2OOCCH3 | 10 | 55 | — | — |
| Ethylene oxide | CH2CH2O | 5 | 9.2 | — | — |
| Ferrous foundry particulate total inhalable dust | — | 10 | — | — | |
| respirable dust | — | 4 | — | — | |
| Formaldehyde | HCHO | 2 | 2.5 | 2 | 2.5 |
| Grain dust | — | 10 | — | — | |
| Halogeno-platinum compounds (complex co-ordination compounds in which the platinum atom is directly co-ordinated to halide groups) (as Pt) | — | 0.002 | — | — | |
| Hardwood dust | — | 5 | — | — | |
| Hydrazine | N2H4 | 0.02 | 0.03 | 0.1 | 0.13 |
| Hydrogen cyanide | HCN | — | — | 10 | 11 |
| Iodomethane | CH3I | 2 | 12 | — | — |
| Isocyanates, all (as -NCO) | — | 0.02 | — | 0.07 | |
| Maleic anhydride | C4H2O3 | — | 1 | — | 3 |
| Man-made mineral fibre* | — | 5 | — | — | |
| 2-Methoxyethanol | CH3OCH2CH2OH | 5 | 16 | — | — |
| 2-Methoxyethyl acetate | CH3COOCH2CH2OCH3 | 5 | 25 | — | — |
| 4,4'-Methylenedianiline | CH2(C6H4NH2)2 | 0.01 | 0.08 | — | — |
| Nickel and its inorganic compounds (except nickel carbonyl): | Ni | ||||
| water-soluble nickel compounds (as Ni) | — | 0.1 | — | — | |
| nickel and water-insoluble nickel compounds (as Ni) | — | 0.5 | — | — | |
| 2-Nitropropane | CH3CH(NO2)CH3 | 5 | 19 | — | — |
| Phthalic anhydride | C8H4O3 | — | 4 | — | 12 |
| Polychlorinated biphenyls (PCB) | C12CH(10−×)Cl× | — | 0.1 | — | — |
| Propylene oxide | C3H6O | 5 | 12 | — | — |
| Rubber fume** | — | 0.6 | — | — | |
| Rubber process dust | — | 6 | — | — | |
| Silica, respirable crystalline | SiO2 | — | 0.3 | — | — |
| Softwood dust | — | 5 | — | — | |
| Styrene | C6H5CH=CH2 | 100 | 430 | 250 | 1080 |
| o-Toluidine | CH3C6H4NH2 | 0.2 | 0.89 | — | — |
| Trichloroethylene | CCl2=CHCl | 100 | 550 | 150 | 820 |
| Triglycidyl isocyanurate (TGIC) | C12H15N3O6 | — | 0.1 | — | — |
| Trimellitic anhydride | C9H4O5 | — | 0.04 | — | 0.12 |
| Vinyl chloride*** | CH2=CHCI | 7 | — | — | — |
| Vinylidene chloride | CH2=CCl2 | 10 | 40 | — | — |
| Wool process dust | — | 10 | — | — | |
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