Health and Safety at Work (Hazardous Substances) Regulations 2017

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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 classification		Incompatible substances and materials
2.1.1		All class 1 substances
		Class 2.1.2 substances
		All class 3 substances
		All class 4 substances
		All class 5 substances

2.1.2		All class 1 substances
		Class 2.1.1 substances
		All class 3 substances
		All class 4 substances
		All class 5 substances

3.1		All class 1 substances
		All class 2 substances
		Class 3.2 substances
		All class 4 substances
		All class 5 substances

3.2		All 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

4.1.2		All 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

4.1.3		All class 1 substances
		All class 2 substances
		Class 3.1 substances
		Class 4.2 substances
		All class 5 substances

4.2		All 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

4.3		All 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 classification		Quantity
2.1.1A		100 kg (for non-permanent gas)
		100 m³ (for permanent gas)
2.1.2A		3 000 L aggregate water capacity
3.1A		Any amount
3.1B		250 L (when in containers of more than 5 L)
		500 L (when in containers of 5 L or less)
3.2A		Any amount
3.2B		100 L
4.1.1A		100 kg
4.1.2A, 4.1.2B		Any amount
4.1.2C, 4.1.2D		25 kg
4.1.2E, 4.1.2F		50 kg
4.1.3A		Any amount
4.1.3B		100 kg
4.2A		Any amount
4.2B		100 kg
4.3A		Any amount
4.3B		100 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 classification		Minimum quantity of flammable substance
2.1.1A, 2.1.1B		30 m³ (for a permanent gas)
		100 kg (for a non-permanent gas)

2.1.2A		3 000 L aggregate water capacity

3.1A, 3.1B, 3.1C		100 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 classification	Quantity beyond which controls apply for closed containers	Quantity beyond which controls apply when use occurring in open containers
2.1.1A, 2.1.1B	100 kg (or 100 m³ for a permanent gas)	100 kg (or 100 m³ for a permanent gas)
2.1.2A	3 000 L (aggregate water capacity)	3 000 L (aggregate water capacity)
3.1A	20 L	20 L
3.1A (petrol, aviation gasoline, and racing gasoline)	50 L	50 L
3.1B	100 L in containers more than 5 L	50 L
	250 L in containers up to 5 L	50 L
3.1C	500 L in containers more than 5 L	250 L
	1 500 L in containers up to 5 L	250 L
3.2A, 3.2B, and 3.2C	1 L	1 L
4.1.1A	1 kg	1 kg
4.1.1B	100 kg	100 kg
4.1.2A, 4.1.2B	1 kg	1 kg
4.1.2C, 4.1.2D	25 kg	25 kg
4.1.2E, 4.1.2F, 4.1.2G	50 kg	50 kg
4.1.3A, 4.1.3B, 4.1.3C	1 kg	1 kg
4.2A	1 kg	1 kg
4.2B. 4.2C	25 kg	25 kg
4.3A	1 kg	1 kg
HSNO approval number HSR001636 (for pellets containing 570 g/kg aluminium phosphide)	3 kg	3 kg
HSNO approval number HSR001634 (for pellets containing 660 g/kg magnesium phosphide)	3 kg	3 kg
4.3B	25 kg	25 kg
4.3C	50 kg	50 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 classification	SADT	Control temperature	Emergency temperature
3.2A, 3.2B, 3.2C		50°C
4.1.2A, 4.1.2B, 4.1.2C, 4.1.2D, 4.1.2E, 4.1.2F, 4.1.2G	20°C or less	20°C less than the SADT	10°C less than the SADT
	Between 20°C and 35°C	15°C less than the SADT	10°C less than the SADT
	35°C and above	Lesser of 10°C less than the SADT and 55°C	5°C less than the SADT
4.1.3A, 4.1.3B, 4.1.3C		50°C
4.2A, 4.2B, 4.2C		50°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 place	Public place
≤2 000	16	8
>2 000, ≤10 000	20	10
>10 000, ≤100 000	25	12.5
>100 000, ≤500 000	30	15
>500 000	As 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 place			Public place
	4.2A	4.1.1A	4.1.1B	4.2A	4.1.1A	4.1.1B
	4.3A	4.2B	4.2C	4.3A	4.2B	4.2C
		4.3B	4.3C		4.3B	4.3C
≤2 000	10	6	6	5	3	3
>2 000, ≤10 000	12	10	6	6	5	3
>10 000, ≤100 000	16	12	8	8	6	4
>100 000, ≤500 000	20	16	10	10	8	5
>500 000	As 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 classification		Quantity (L)
3.1A		100
3.1B		1 000
3.1C, 3.1D		10 000
3.2A, 3.2B, 3.2C		100
4.1.2A, 4.1.2B		50
4.1.2C, 4.1.2D		100
4.1.2E, 4.1.2F, 4.1.2G		200
4.1.3A, 4.1.3B, 4.1.3C		100
4.2A		100
4.3A		100
4.3B		1 000
4.3C		10 000
9.1A		100
9.1B, 9.1C		1 000
9.1D		10 000

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

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