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

Regulation 2(5)

SCHEDULE 1LIST OF SUBSTANCES ASSIGNED MAXIMUMEXPOSURE LIMITS

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

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

—

—

*

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.