(a) The quantities set-out-below relate to each installation or group of installations belonging to the same occupier where the distance between the installations is not sufficient to avoid, in foreseeable circumstances, any aggravation of major-accident hazards. These quantities apply in any case to each group of installations belonging to the same occupier where the distance between the installations is less than 500 metres.

(b) For the purpose of determining the threshold quantity of a hazardous chemical in an industrial installation, account shall also be taken of any hazardous chemicals which is:-

(i) in that part of any pipeline under the control of the occupier have control of the site, which is within 500 metres off that site and connected to it;

(ii) at any other site under the control of the same occupier any part of the boundary of which is within 500 metres of the said site; and

(iii) in any vehicle, vessel, aircraft or hovercraft under the control of the same occupier which is used for storage purpose either at the site or within 500 metres of it;

but no account shall be taken of any hazardous chemical which is in a vehicle, vessel, aircraft or hovercraft used for transporting it.

S.No.	Chemical	Threshold Quantity		CAS Number
		for application of Rules, 5, 7-9 and 13-15	for application of Rules 10-12
1	2	3	4	5
GROUP 1-TOXIC SUBSTANCES
1	Aldicarb	100 kg		116-06-3
2	4-Aminodiphenyl	1 kg		96-67-1
3	Amiton	1 kg		78-53-5
4	Anabasine	100 kg		494-52-0
5	Arseinc pentoxide, Arsenic (V) acid & salts	500 kg
6	Arsenic trioxide, Arseius (III) acid & salts	100 kg
7	Arsine (Arsenic hydride)	10 kg		7784-42-1
8	Azinphos-ethyl	100 kg		2642-71-9
9	Azinphos-melhyl	100 kg		86-50-0
10	Benzidine	1 kg		92-87-5
11	Benzidine salts	1 kg
12	Beryllium (powders, compounds}	10 kg
13	Bis (2-chloroethyl) sulphide	1 kg		505-60-2
14	Bis (chloromethyl) ether	1 kg		542-88-1
15	Carbophuran	100 kg		1563-66-2
16	Carbophenothion	100 kg		786-19-6
17	Chlorefenvinphos	100 kg		470-90-6
18	4-(Chloroformyl) morpholine	1 kg		15159-40-7
19	Chloromethyl methyl ether	1 kg		107-30-2
20	Cobalt (metal, oxides, carbonates, sulphides, as powders)	1 t
21	Crimidine	100 kg		535-89-7
22	Cynthoate	100 kg		3734-95-0
23	Cycloheximide	100 kg		66-81-9
24	Demeton	100 kg		8065-48-3
25	Dialifos	100 kg		10311-84-9
26	OO-Diethyl S-ethylsulphinylmethyl phosphorothiate	100 kg		2588-05-8
27	OO-Diethyl S-ethylsulphonylmethyl phosphorothioate	100 kg		2588-06-9
28	OO-Dielhyl S-ethyllhiomethyl Phosphorothioate	100 kg		2600-69-3
29	OO-Diethyl S-isopropylthiomethyl phosphorodithioate	100 kg		78-52-4
30	OO-Diethyl S-propylthiomethyl phosphorodithioate	100 kg		3309-68-0
31	Dimefox	100 kg		115-26-4
32	Dimethylcarbamoyl chloride	1 kg		79-44-7
33	Dimethylnitrosamine	1 kg		62-75-9
34	Dimethyl phosphoramidocynicidic acid	1 t		63917-41-9
35	Diphacinone	100 kg		82-66-6
36	Disulfoton	100 kg		298-04-4
37	EPN	100 kg		2104-64-5
38	Ethion	100 kg		563-12-2
39	Fensulfothion	100 kg		115-90-2
40	Fluenetil	100 kg		4301-50-2
41	Fluroacetic acid	1 kg		144-49-0
42	Fluoroacetic acid, salts	1 kg
43	Fluoroacelic acid, esters	1 kg
44	Fluoroacetic acid, amides	1 kg
45	4-Fluorobutyric acid	1 kg		462-23-7
46	4-FIuorobutyric acid, salts	1 kg
47	4-Fluorobutyric acid, esters	1 kg
48	4-Fluorobutyric acid, amides	1 kg
49	4-Florocrotonic acid	1 kg		37759-72-1
50	4-Fluorocrotonic acid, salts	1 kg
51	4-Fluorocrotonic acid, esters	1 kg
52	4-Fluorocrotonic acid, amides	1 kg
53	4-Fluoro-2-hydroxybutyric acid, amides	1 kg
54	4-Fluoro-2-hydroxybutyric acid, salts	1 kg
55	4-Fluoro-2-hydroxybutyric acid, esters	1 kg
56	4-Fluoro-2-hydroxybutyric acid, amides	1 kg
57	Glycolonitrile (Hydroxyacetonitrile)	100 kg		107-16-4
58	1, 2, 3, 7, 8, 9-Hexachlorodibenzo-p-dioxin	100 g		194-8-74-3
59	Hexamethylphosphoramide	1 kg		680-31-9
60	Hydrogen sclenide	10 kg		7783-07-5
61	Isobenzan	100 kg		297-78-9
62	Isodrin	100 kg		465-73-6
63	Juglone (5-Hydroxynaphithalene 1, 4 dione)	100 kg		481-39-0
64	4, 4-Methylenebis (2-chloroniline)	10 kg		101-14-4
65	Methyl isocynate	150 kg	150 kg	624-83-9
66	Mevinphos	100 kg		7786-34-7
67	2-Naphlhylamine	1 kg		91 -59-8
68	2-Nickcl (metal, oxides, carbonates, sulphides, as powders)	1 t
69	Nickel tetracarbonyl	10 kg		13463-39-3
70	Oxygendisulfoton	100 kg		2497-07-6
71	Oxygen difuoride	10 kg		7783-41-7
72	Paraxon (Diethyl 4-nitsphenyl phosphate)	100 kg		311 -45-5
73	Parathion	100 kg		56-38-2
74	Parathion-methyl	100 kg		298-00-0
75	Pentaborane	100 kg		19624-22-7
76	Phorate	100 kg		298-02-2
77	Phosacetim	100 kg		4104-14-7
78	Phosgene (carbonyl chloride)	750 kg	750 kg	75-44-5
79	Phosphamidon	100 kg		13171-41-6
80	Posphine (Hydrogen phosphide)	100 kg		7803-51 -2
81	Promurit (1-(3, 4-dichlorophenyl)-3 triazenethiocarboxamide)	100 kg		5836-73-7
82	1, 3-Propanesultone	1 kg		1120-7t-4
83	1 -Propen-2-chloro- 1, 3-diol diacetate	10 kg		10118-72-6
84	Pyrazoxon	100 kg		108-34-9
85	Selenium hexafluoride	10 kg		7783-79-1
86	Sodium selenite	100 kg		10102-18-8
87	Stibine (Antimony hydride)	100 kg		7803-52-3
88	Sulfotep	100 kg		3689-24-5
89	Sulphur dichloride	1 t		10545-99-0
90	Tellurium hexanuroride	100 kg		7783-80-4
91	TEPP	100 kg		107-49-3
92	2, 3, 7, 8-Tetrachlorodibenzo-p-dioxin (TCDD)	1 kg		1746-01 -6
93	Tetramethylenedisulphotetramine	1 kg		80-12-6
94	Thionazin	100 kg		297-97-2
95	Tirpate (2, 4-Dimethyl-l, 3-dilhiolane-2-carboxaldehyde O-methylcarbarnoyloxime)	100 kg		26419-8
96	Trichloromethanesulphenyl chloride	100 kg		594-42-3
97	1-Tri (cyclohexyl) stannyl-l H-1, 2,. 4-triazole	100 kg		41083-11-8
98	Triethylenemelamine	10 kg		51-18-3
99	Warfarin	100 kg		81-81-2
GROUP 2-TOXIC SUBSTANCES
100	Acetonecyanohydrin (2-Cyanopropan-2-01)	200 t		75-86-5
101	Acrolein (2-Propenal)	20 t		107-02-8
102	Acrylonitrile	20 t	200 t	107-13-1
103	Allyl alcohol (Propen-1-01)	200 t		107-18-6
104	Alylamine	200 t		107-11-9
105	Ammonia	50 t	500 t	7664-41-7
106	Bromine	40 t		7726-95-6
107	Carbon disulphide	20 t	200 t	75-15-0
108	Chlorine	10 t	25 t	7782-fO 5
109	Dipneyl ethane di-isocynate (MDI)	20 t		101-68-8
110	Ethylene dibromide (1, 2-Dibromoethane)	5 t		106-93-4
111	Ethyleneimine	50 t		151-56-4
112	Formaldehyde (concentration £90%)	5 t		50-00 0
113	Hydrogen chloride (liquified gas)	25 t	250 t	7647-01-0
114	Hydrogen cynide	5 t	20 t	74-90-8
115	Hydrogen fluoride	5 t	50 t	7664-39-3
116	Hydrogen sulphide	5 t	50 t	7783-06-4
117	Methyl bromide (Bromomethane)	20 t		74-83-9
118	Nitrogen oxides	50 t		11104-93-1
119	Propylineimine	50 t		75-55-8
120	Sulphur dioxide	20 t	250 t	7446-09-5
121	Sulphur trioxide	15 t	75 t	7446-11-9
122	Tetraethyl Iead	5 t		78-00-2
123	Tetramethyl Iead	5 t		75-74-1
124	Toluene di-isocvnate (TDI)	10 t		584-84-9
				75-01-4
GROUP 3--HIGHLY REACTIVE SUBSTANCES
125	Acetylene (ethyne)	5 t		74-86-2
126	a. Ammonium nitrate (1)	350 t	2500 t	6484-52-2
	b. Ammonium nitrate in form of fertiliser (2)	1250 t
127	2 2-Bis (tert-butylperoxy) butane) (eoncentration ³70%)	5 t		2167-23-9
128	1 I-Bis (tert-butylperoxy) cyclohexane (concentration ³80%)	5 t		3006-86-8
129	tert-Butyl proxyacetate (concentration £70%)	5 t		107-71-1
130	Tert-Butyl peroxyisobutyrate (concentration-- ³80%)	5 t		109-13-7
131	tert-Butyl peroxy isopropyl carbonate (concentration-³80%)	5 t		2372-21-6
132	tert-Butyl peroxymaleate (concentration-³80%)	5 t		1931-62-0
133	Tert-Butyl peroxypivalate (concentration ³77%)	50 t		927-07-1
134	Dibenzyl peroxydicarbonate (concentration ³90%)	5 t		2144-45-8
135	Di-sec-butyl peroxydicarbonate (concentration ³80%)	5 t		19910-65-7
136	Diethyl peroxydicarbonate (concentration ³30%)	50 t		14666-78-5
137	2, 2-dihydroperoxypropane (concentration ³30%)	5 t		2614-76-08
138	Di-isobutyryl peroxide concentration ³50%)	50 t		3437-84-1
139	Di-n-propyl peroxydicarbonate (concentration ³80%)	5 t		16066-38-9
140	Ethylene oxide	5 t	50 t	75-21-8
141	Ethyl nitrate	50 t		625-58-1
142	3, 3, 6, 6, 9, 9Hexamcthyl-1, 2, 4, 5-tert oxacyclononane (concentration ³75%)	50 t		22397-38-7
143	Hydrogen	2 t	50 t	1333-74-0
144	Liquid Oxygen	200 t		7782-41-7
145	Methyl ethyl ketone peroxide (concentration ³60%)	50t		1338-23-4
146	Melhyl isobutyl ketone peroxide (concentration ³60%)	50 t		37206-20-5
147	Peracelic acid (concentration ³60%)	50 t		79-21-0
148	Propylene oxide	50 t		75-56-9
149	Sodium chlorate	25 t		7775-09-9
GROUP 4-EXPLOSIVE SUBSTANCES
150	Barium azide	50 t		18810-58-7
151	Bis (2,4, 6-trinilrophenyl) amine	50 t		131-073-7
152	Chlorotrinitro benzene	50 t		28260-61-9
153	Cellulose nitrate (containing 12.6% Nitrogen)	50 t		9004-70-0
154	Cyclotetramethyleneteranitramine	50 t		2691-41-0
155	Cyclotrimetylenetiranitramine	50 t		121-82-1
156	Diazodinitrophenol	10 t		7008-81-3
157	Diethylene glycol dinitrate	10 t		693-21-0
158	Dinitrophenol, salts	50 t
159	Ethylene glycol dinitrate	10 t		628-96-6
160	1-Gyanyl-4-nitrosaminoguanyl-1-tetrazene	10 t		109-27-3
161	2, 2', 4, 4,' 6, 6'-Hexanirostilbene	50 t		20062-22-0
162	Hydrazine nitrate	50 t		13464-97-6
163	Lead azide	50 t		13424-46-9
164	Lead styphnate (Lead 2, 4, 6-trinitroresorcinoxide)	50 t		15245 44-0
165	Mercury fuliminate	10 t		20820-45-5
				628-86-4
166	N-Methyl-N, 2, 4, 6-tetranitroaniline	50 t		479-45-8
167	Nitroglycerine	10 t	10 t	55-63-0
168	Pentacrythritol tetranitrate	50 t		78-11-5
169	Picric acid (2, 3, 6-Tr.nitrophenol)	10 t		88-89-1
170	Sodium picramate	50 t		831-52-7
171	Styphnic acid (2, 4, 6-Trinitroresorcinol)	50 t		82-71-3
172	1, 3, 5-Triamino-2, 4, 6-trinitrobenzene	50 t		3058-38-6
173	Trinitroaniline-	50 t		2695242-1
174	2, 4, 6-Trinitroanisole	50 t		606-35-9
175	Trinitrobenzene	50 t		25377-32-6
176	Trinitrobenzoic acid	50 t		35860-50-5
				129-66-8
177	Trinitrocresol	50 t		2890S-71-7
178	2,4, 6-Trinitrophenitolc	50 t		47324-3
179	2,4, 6-Trinitrotulene	50 t	50 t	118-96-7

1	2	3	4	5
GROUP 5-FLAMMABLE CHEMICALS
1	Flammable gases: Substances which in the gaseous state normal pressure and mixed with air become flammable and the boiling point of which at normal pressure is 20°C or below;	15 t	200 t
2	Highly flammable liquids: Substances which have a flash point lower than 23°C and the boiling point Of which at normal pressure is above 20°C;	1000 t	50,000 t
3	Flammable liquids: Substances which have a Rash point lower than 65ø C and which remain liquid under pressure, where particular processing conditions, such as high pressure and high temperature, may create major accident hazards.	25 t	200 t

(1) This applies to ammonium nitrate and mixtures of ammonium nitrate where the nitrogen content derived from the ammonium nitrate is greater than 28% by weight and aqueous solutions of ammonium nitrate where thc concentration of ammonium nitrate is greater than 90% by weight.

(2) This applies to straight ammonium nitrate fertilizers and to compound fertilizers where the nitrogen content derived from the ammonium nitrate is greater than 28% by weight (a compound fertilizer contains ammonium nitrate together with phosphate and/or potash).