
1 

(1) These Regulations may be cited as the Control of Substances Hazardous to Health (Amendment) Regulations 1990 and shall come into force on 1st January 1991.
(2) In these regulations, unless the context otherwise requires, “the principal Regulations” means the Control of Substances Hazardous to Health Regulations 1988.
2 
For Schedule 1 to the principal Regulations there shall be substituted the Schedule set out in the Schedule to these Regulations.
Signed by order of the Secretary of State.
Eric Forth
Parliamentary Under Secretary of State,
Department of Employment
8th October 1990
THE SCHEDULE
Regulation 2

SCHEDULE 1
Regulations 2(1), 7(4)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 TW A reference period) Short-term maximum exposure limit (10-minute reference period)
Substance Formula ppm mg m−3 ppm mg m−3
Acrylamide CH2=CHCONH2 — 0.3 — —
Acrylonitrile CH2=CHCN 2 4 — —
Arsenic & compounds except arsine (as As) As — 0.1 — —
Benzene C6H7sub6; 5 15 — —
Buta-1,3-diene CH2=CHCH=CH2 10 22 — —
2-Butoxyethanol CH4H9OCH2CH2OH 25 120 — —
Cadmium & 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 disulphide CS2 10 30 — —
1,2-Dibromoethane (Ethyl dibromide) BrCG2CH2Br 0.5 4 — —
Dichloromethane CH2Cl2 100 350 — —
2,2'-Dichloro-4,4'-methylene dianiline (MbOCA) CH2(C6H3ClNH2)2 — 0.005 — —
2-Ethoxyethanol C2H5OCH2CH2OH 10 37 — —
2-Ethoxyethyl acetate C2H5OCH2CH2OOCCH3 10 54 — —
Ethylene oxide CH2CH2O 5 10 — —
Formaldehyde HCHO 2 2.5 2 2.5
Hydrogen cyanide HCN — — 10 10
Isocyanates, all (as-NCO)  — 0.02 — 0.07
Man-made mineral fibre  — 5 — —
2-Methoxyethanol CH3OCH2CH2OH 5 16 — —
2-Methoxyethyl acetate CH3COOCH2CH2OCH3 5 24 — —
Rubber process dust  — 8 — —
Rubber fume  — 0.6 — —
Styrene C6H5CH=CH2 100 420 250 1050
1,1,1-Trichloroethane CH3CCl3 350 1900 450 2450
Trichloroethylene CCl2=CHCl 100 535 150 802
Vinyl chloride CH2=CHCl 7 — — —
Vinylidene chloride CH2=CCl2 10 40 — —
Wood dust (hard wood)  — 5 — —
