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The Control of Substances Hazardous to Health (Amendment) Regulations 1991

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Regulation 2(2)

SCHEDULE 1SCHEDULE TO BE SUBSTITUTED AS SCHEDULE 1 TO THE PRINCIPAL REGULATIONS

Regulations 2(1), 7(4) and 12(2)

SCHEDULE 1LIST OF SUBSTANCES ASSIGNED MAXIMUM EXPOSURE LIMITS

The maximum exposure limits of the dusts included in the list below refer to the toinhalable dust fraction, unless otherwise stated.

SubstanceFormulaReference periods
Long-term maximum exposure limit (8-hour TWA reference period)Short-term maximum exposure limit (10-minute reference period)
ppmmg m−3ppmmg 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 ml1, 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.

AcrylamideCH2=CHCONH2—0.3——
AcrylonitrileCH2=CHCN24——
Arsenic and compounds except arsine (as As)As—0.1——
BenzeneC6H67515——
Buta-1,3-dieneCH2=CHCH=CH21022——
2-ButoxyethanolC4H9OCH2CH2OH25120——
Cadmium and cadmium compounds, except cadmium oxide fume and cadmium sulphide pigments (as Cd)Cd—0.05——
Cadmium oxide fume (as Cd)CdO—0.05—0.05
Cadmium sulphide pigments (respirable dust as Cd)CdS—0.04——
Carbon disulphideCS21030——
Chromium (VI) compounds (as Cr)Cr—0.05——
1,2–Dibromoethane (Ethylene dibromide)BrCH2CH2Br0.54——
DichloromethaneCH2Cl2100350——
2,2'–Dichloro–4,4'–methylene dianiline (MbOCA)CH2(C6H3ClNH2)2—0.005——
2-EthoxyethanolC2H5OCH2CH2OH1037——
2-Ethoxyethyl acetateC2H5OCH2CH2OOCCH31054——
Ethylene oxideCH2CH2O510——
FormaldehydeHCHO22.522.5
Grain dust—10——
Hydrogen cyanideHCN——1010
Isocyanate, all (as-NCO)—0.02—0.07
*Man-made mineral fibre—5——
2-MethoxyethanolCH3OCH2CH2OH516——
2-Methoxyethyl acetateCH3COOCH2CH2OCH3524——
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——
Rubber process dust—8——
†Rubber fume—0.6——
Silica, respirable crystallineSiO2—0.4——
StyreneC6H5CH=CH21004202501,050
1,1,1-TrichlorotehaneCH3CCl33501,9004502,450
TrichloroethyleneCCl2=CHCl100535150802
‡Vinyl chlorideCH2=CHCl7———
Vinylidene chlorideCH2=CCl21040——
Wood dust (hard wood)—5——

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