Flammables (2)

8/12/2019 Flammables (2)

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HAZARDOUS SUBSTANCES

HSNO Flammable Classes

3 and 4


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Flammable Liquids - Class 3

3.1 Liquids

category A, B, C, & D

3.2 Liquid

Desensitised explosive

category A, B, & C


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Class 3.1 Flammable Liquids

Class 3.1A - very high hazard

flash point of less than 230C and initial boiling

point 350C

e.g.: acetone


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Class 3.1 Flammable Liquids

Class 3.1C - medium hazard

Flash point greater or equal to 230C, but less

than 600C

Class 3.1D - low hazard

Flash point greater than 600C, but less than or

equal to 930C


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Class 3.2

3.2A - liquid desensitised explosives: high

hazard

3.2B - liquid desensitised explosives:

medium hazard

3.2C - liquid desensitised explosives: low

hazard


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Class 3 - Safe handling

Containers of 3.1A shall only be opened or

decanted in fume cupboards

Bottles of ready to use reagents stored on

benches or shelves should not exceed

1 litre for category A substances

2.5 litres for category B substances

The opening and pouring of all flammable

liquids should be carried out in a fume

cupboard


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Class 3 - safe handling

Spill - absorb using sand or substance

suitable for absorption of the liquid

Emergency plans

Extinguish any ignition sources - vapour

heavier than air and will sink down to

lowest level


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Storage cabinets - no ignition sources,

secondary containment

No more than 100 litres per cabinet, max.

20 litres per container

Secondary containment to hold 50%

Refrigerators used to store flammablesubstances must be spark proof and labelled

external thermostats and light fittings removed


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Storage of substances category A not to

exceed 5 litres e.g.: ether (trackable)

20 litres maximum for all other categories

If in laboratory, must be an approved

container or storage cabinet.

DG Store (certified) for bulk storage


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Flammable Vapours

Less than 0.5ml of residual ethanol in a 2.5

L Winchester can produce a saturated

air/ethanol vapour mixture. Refilling a 2.5 LWinchester which has held ethanol at 190C

will release 2.5 litres of a saturated ethanol

vapour/air mixture. This can result in over42 litres of flammable vapour!


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Class 4 - Flammable, Solids

4.1.1 Readily combustible

4.1.2 Self reactive 4.1.3 Solid Desensitised explosive

4.2 Spontaneously combustible

4.3 Dangerous when wet


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Class 4 - Flammable Solids

4.1.1A - readily combustible solids and

solids that may cause fire through friction -

medium hazard

4.1.1B - readily combustible solids and

solids that may cause fire through friction -

low hazard


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4.1.2A - self reactive substances, type A

4.1.2 (B - G) - self-reactive substances

4.1.3A - Solid desensitised explosives: high

hazard

4.1.3B - Solid desensitised explosives:

medium hazard

4.1.3C - Solid desensitised explosives: low

hazard


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Picric Acid

Classes 4.1.3A, 6.1B, 6.3B, 6.5B, 8.3A,

9.1D, 9.3B

Class 1.1D but controls only apply to largequantities (25 - 50kg +)

toxic, explosive, corrosive and ecotoxic


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Class 4 - Flammable Solids 4.2A - spontaneously combustible

substances:pyrophoric substances:high

hazard e.g.: phosphorus (yellow/white, dry or in

solution)

4.2B - spontaneously combustible

substances: self-heating substances:

medium hazard e.g.: potassium hydrosulphite 4.2C - spontaneously combustible

substances: self-heating: low hazard


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4.3A - solids that emit flammable gas when

in contact with water: high hazard

Calcium Carbide - emits acetylene gas

4.3B - solids that emit flammable gas when

in contact with water: medium hazard

4.3C - solids that emit flammable gas whenin contact with water: low hazard


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Flammables requiring tracking

3.1A (ether)

3.2A

4.1.2A

4.1.2B

4.1.3A (picric acid) 4.2A

4.3A

Flammables (2)

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