Health and Safety at Work (Hazardous Substances) Regulations 2017

Schedule 9 Matters relevant to class 2, 3, and 4 substances

rr 3, 10.1, 10.3, 10.4, 10.5, 10.12, 10.13, 10.14, 10.17, 10.19, 10.20, 10.22, 10.24, 10.26, 10.28, 10.30, 10.36, 10.37, 11.32, 16.4, 17.99

Table 1 Substances and materials incompatible with class 2, 3, and 4 substances

rr 10.1, 10.5, 16.4

Hazard classificationIncompatible substances and materials
2.1.1All class 1 substances
Class 2.1.2 substances
All class 3 substances
All class 4 substances
All class 5 substances
2.1.2All class 1 substances
Class 2.1.1 substances
All class 3 substances
All class 4 substances
All class 5 substances
3.1All class 1 substances
All class 2 substances
Class 3.2 substances
All class 4 substances
All class 5 substances
3.2All class 1 substances
All class 2 substances
Class 3.1 substances
Class 4.1.2, 4.2, and 4.3 substances
All class 5 substances
4.1.1 (readily combustible solids)All class 1 substances
All class 2 substances
Class 4.1.2, 4.1.3, 4.2, and 4.3 substances
All class 5 substances
4.1.1 (those solids that may cause fire through friction only)Any substance likely to cause a spark when struck against such a class 4.1.1 substance
4.1.2All class 1 substances
All class 2 substances
Class 3.1 and 3.2 substances
Class 4.1.3 and 4.2 substances
All class 5 substances
Catalytic impurities that have a detrimental influence on the thermal stability and the hazard presented by class 4.1.2 substances
4.1.3All class 1 substances
All class 2 substances
Class 3.1 substances
Class 4.2 substances
All class 5 substances
4.2All class 1 substances
All class 2 substances
All class 3 substances
Class 4.1.1, 4.1.2, 4.1.3, and 4.3 substances
All class 5 substances
Air
Oxygen
4.3All class 1 substances
All class 2 substances
All class 3 substances
Class 4.1.1, 4.1.2, 4.1.3, and 4.2 substances
All class 5 substances
All class 8 substances
Water

Table 2 Quantities of class 2, 3, and 4 substances that must be secured if left unattended

r 10.4

Hazard classificationQuantity
2.1.1A100 kg (for non-permanent gas)
100 m3 (for permanent gas)
2.1.2A3 000 L aggregate water capacity
3.1AAny amount
3.1B250 L (when in containers of more than 5 L)
500 L (when in containers of 5 L or less)
3.2AAny amount
3.2B100 L
4.1.1A100 kg
4.1.2A, 4.1.2BAny amount
4.1.2C, 4.1.2D25 kg
4.1.2E, 4.1.2F50 kg
4.1.3AAny amount
4.1.3B100 kg
4.2AAny amount
4.2B100 kg
4.3AAny amount
4.3B100 kg

Table 3 Quantities of class 2 and 3 substances requiring equipment or container to be electrically bonded and earthed

rr 10.13, 10.17, 10.19

Hazard classificationMinimum quantity of flammable substance
2.1.1A, 2.1.1B30 m3 (for a permanent gas)
100 kg (for a non-permanent gas)
2.1.2A3 000 L aggregate water capacity
3.1A, 3.1B, 3.1C100 L (if closed)
25 L (if decanting)
5 L (if open occasionally)
1 L (if in open container for continuous use)

Table 4 Quantities of class 2, 3, and 4 substances that activate hazardous substance location and transit depot requirements

rr 3, 10.3, 10.24, 10.26, 10.37, 11.32

Hazard classificationQuantity beyond which controls apply for closed containersQuantity beyond which controls apply when use occurring in open containers
2.1.1A, 2.1.1B100 kg (or 100 m3 for a permanent gas)100 kg (or 100 m3 for a permanent gas)
2.1.2A3 000 L (aggregate water capacity)3 000 L (aggregate water capacity)
3.1A20 L20 L
3.1A (petrol, aviation gasoline, and racing gasoline)50 L50 L
3.1B100 L in containers more than 5 L50 L
250 L in containers up to 5 L50 L
3.1C500 L in containers more than 5 L250 L
1 500 L in containers up to 5 L250 L
3.2A, 3.2B, and 3.2C1 L1 L
4.1.1A1 kg1 kg
4.1.1B100 kg100 kg
4.1.2A, 4.1.2B1 kg1 kg
4.1.2C, 4.1.2D25 kg25 kg
4.1.2E, 4.1.2F, 4.1.2G50 kg50 kg
4.1.3A, 4.1.3B, 4.1.3C1 kg1 kg
4.2A1 kg1 kg
4.2B. 4.2C25 kg25 kg
4.3A1 kg1 kg
HSNO approval number HSR001636 (for pellets containing 570 g/kg aluminium phosphide)3 kg3 kg
HSNO approval number HSR001634 (for pellets containing 660 g/kg magnesium phosphide)3 kg3 kg
4.3B25 kg25 kg
4.3C50 kg50 kg

Table 5 Maximum surface temperature of equipment that may contact class 2 and 3 substances of known auto-ignition temperatures

rr 10.12, 10.14, 10.20

Auto-ignition temperature of substance (A)Required temperature of surfaces in contact with mixture of flammable vapour evolving from substance and air
A ≥ 562.5°C< 450°C
375°C < A < 562.5°C< 300°C
250°C < A < 375°C< 200°C
169°C < A < 250°C< 135°C
125°C < A < 169°C< 100°C
A < 125°C< 85°C

Note: This table applies if the substance is maintained at an average temperature of below 40°C.

Table 6 Control and emergency temperatures for class 3.2 and 4 substances

r 10.22

Hazard classificationSADTControl
temperature
Emergency
temperature
3.2A, 3.2B, 3.2C50°C
4.1.2A, 4.1.2B, 4.1.2C, 4.1.2D, 4.1.2E, 4.1.2F, 4.1.2G20°C or less20°C less than the SADT10°C less than the SADT
Between 20°C and 35°C15°C less than the SADT10°C less than the SADT
35°C and aboveLesser of 10°C less than the SADT and 55°C5°C less than the SADT
4.1.3A, 4.1.3B, 4.1.3C50°C
4.2A, 4.2B, 4.2C50°C

Table 7 Separation distances for class 3.2, 4.1.2 and 4.1.3 substances

rr 10.28, 10.36

Aggregate quantity (kg or L)Minimum separation distance between hazardous substance location and place (m)
Protected placePublic place
≤2 000168
>2 000, ≤10 0002010
>10 000, ≤100 0002512.5
>100 000, ≤500 0003015
>500 000As determined by risk assessment in accordance with section 3.4.2.2 and Appendix C Fifth Committee Draft AS/NZ Draft Standard 9832.CDR and AS/NZS 4360:2004

Table 8 Separation distances for class 4.1.1, 4.2, and 4.3 substances

rr 10.28, 10.36

Quantity (kg)Minimum separation distance between hazardous substance location and place (m)
Protected placePublic place
4.2A4.1.1A4.1.1B4.2A4.1.1A4.1.1B
4.3A4.2B4.2C4.3A4.2B4.2C
4.3B4.3C4.3B4.3C
≤2 0001066533
>2 000, ≤10 00012106653
>10 000, ≤100 00016128864
>100 000, ≤500 0002016101085
>500 000As determined by risk assessment in accordance with section 3.4.2.2 and Appendix C Fifth Committee Draft AS/NZ Draft Standard 9832.CDR and AS/NZS 4360:2004

Table 9 Threshold quantities for secondary containment

r 10.30, 17.99

Hazard classificationQuantity (L)
3.1A100
3.1B1 000
3.1C, 3.1D10 000
3.2A, 3.2B, 3.2C100
4.1.2A, 4.1.2B50
4.1.2C, 4.1.2D100
4.1.2E, 4.1.2F, 4.1.2G200
4.1.3A, 4.1.3B, 4.1.3C100
4.2A100
4.3A100
4.3B1 000
4.3C10 000
9.1A100
9.1B, 9.1C1 000
9.1D10 000

Note: In this schedule, a reference to a class 9 substance is for information only. The EPA is responsible for setting the controls on class 9 substances.

Compare: SR 2001/116 Schedule 3