Liquefied petroleum gas, such as commercial propane and commercial butane, and any mixtures thereof held at a pressure greater than 1.4 bar absolute

25

Liquefied petroleum gas, such as commercial propane and commercial butane, and any mixture thereof held under refrigeration at a pressure of 1.4 bar absolute or less

50

Phosgene

2

Chlorine

10

Hydrogen fluoride

10

Sulphur trioxide

15

Acrylonitrile

20

Hydrogen cyanide

20

Carbon disulphide

20

Sulphur dioxide

20

Bromine

40

Ammonia (anhydrous or as solution containing more than 50% by weight of ammonia)

100

Hydrogen

2

Ethylene oxide

5

Propylene oxide

5

tert–Butyl peroxyacetate

5

tert–Butyl peroxyisobutyrate

5

tert–Butyl peroxymaleate

5

tert–Butyl peroxy isopropyl carbonate

5

Dibenzyl peroxydicarbonate

5

2,2–Bis(tert–Butylperoxy)butane

5

1,1–Bis(tert–Butylperoxy)cyclohexane

5

Di–sec–Butyl peroxydicarbonate

5

2,2–Dihydroperoxypropane

5

Di–n–propyl peroxydicarbonate

5

Methyl ethyl ketone peroxide

5

Sodium chlorate

25

Cellulose nitrate other than—(a) cellulose nitrate to which the Explosives Act 1875 applies; or (b) solutions of cellulose nitrate where the nitrogen content of the cellulose nitrate does not exceed 12.3% by weight and the solution contains not more than 55 parts of cellulose nitrate per 100 parts by weight of solution

50

Ammonium nitrate and mixtures of ammonium nitrate where the nitrogen content derived from the ammonium nitrate exceeds 28% of the mixture by weight other than—

(a) mixtures to which the Explosives Act 1875 applies; or

(b) ammonium nitrate based products manufactured chemically for use as fertiliser which comply with Council Directive 80/876/EEC

500

Aqueous solutions containing more than 90 parts by weight of ammonium nitrate per 100 parts by weight of solution

500

Liquid oxygen

500

1. Gas or any mixture of gases which is flammable in air and is held in the installation as a gas.

15

2. A substance or any mixture of substances which is flammable in air and is normally held in the installation above its boiling point (measured at 1 bar absolute) as a liquid or as a mixture of liquid and gas at a pressure of more than 1.4 bar absolute.

25 being the total quantity of substances above the boiling points whether held singly or in mixtures.

3. A liquefied gas or any mixture of liquefied gases, which is flammable in air, has a boiling point of less than 0°C (measured at 1 bar absolute) and is normally held in the installation under refrigeration or cooling at a pressure of 1.4 bar absolute or less.

50 being the total quantity of substances having boiling points below 0°C whether held singly or in mixtures.

4. A liquid or any mixture of liquids not included in items 1 to 3 above, which has a flash point of less than 21°C.

10,000