# Table 1: Initial Isolation and Protective Action Distances

- **operation:** document
- **citation:** ERG 2024, Table 1: Initial Isolation and Protective Action Distances
- **title:** Table 1: Initial Isolation and Protective Action Distances
- **source type:** guidance
- **agency:** U.S. DOT / Transport Canada / SICT
- **status:** guidance
- **official:** true
- **published on:** 2024-04-04
- **effective on:** Not available
- **summary:** Official ERG2024 table 1: initial isolation and protective action distances guidance, pages 290-335.
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- **source url:** https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/2024-04/ERG2024-Eng-Web-a.pdf#page=290
**body:**

HOW TO USE TABLE 1 – INITIAL ISOLATION AND
PROTECTIVE ACTION DISTANCES
(1) (2) (3) (4) (5) The responder should already have:
•
identified the material by its ID number and name (if you cannot find an ID number,
use the Name of Material index in the blue section to find that number);
•
confirmed that the material is highlighted in green in the yellow or blue section. If
not, Table 1 doesn’t apply;
•
found the three-digit guide for the material, in order to consult emergency actions
it recommends along with this table; and
•
noted the wind direction
Look in Table 1 (green section) for the ID number and name of the material involved.
Some ID numbers have more than one shipping name listed. Look for the specific name
of the material. If you do not know the shipping name and Table 1 lists more than one
name for the same ID number, use the entry with the largest distances.
Determine if the incident involves a SMALL or LARGE spill and if it is DAY or NIGHT.
A SMALL SPILL consists of a release of 208 liters (55 US gallons) or less. This generally
corresponds to a spill from a single small package (for example, a drum), a small cylinder,
or a small leak from a large package. A LARGE SPILL consists of a release of more than
208 liters (55 US gallons). This usually involves a spill from a large package, or multiple
spills from many small packages. DAY is any time after sunrise and before sunset.
NIGHT is any time between sunset and sunrise.
Look up the INITIAL ISOLATION DISTANCE.
This distance defines the radius of a zone (initial
isolation zone) surrounding the spill in ALL
DIRECTIONS. In this zone, protective clothing
and respiratory protection is required. Evacuate
the general public in a direction perpendicular
to wind direction (crosswind) and away from
the spill.
Initial Isolation
Zone
Initial Isolation
Distance
Spill
Look up the PROTECTIVE ACTION DISTANCE.
For a given material, spill size, and whether day or night, Table 1 gives the downwind
distance—in kilometers and miles—from the spill or leak source, for which you should
consider protective actions. For practical purposes, the protective action zone (i.e.,
the area in which people are at risk of harmful exposure) is a square. Its length and
width are the same as the downwind distance shown in Table 1. Protective actions are
the steps you take to preserve the health and safety of emergency responders and
Page 288

(6) the public. People in this area should be evacuated and/or sheltered-in-place.
For more information, consult the “Protective Actions” section.
Initiate protective actions beginning with those closest to the spill site and working
away in a downwind direction. When a water-reactive TIH (PIH in the US) producing
material is spilled into a river or stream, the source of the toxic gas may move with the
current or stretch from the spill point downstream for a large distance.
In the figure below, the spill is located at the center of the small black circle. The larger
circle represents the initial isolation zone around the spill. The square (the protective
action zone) is the area in which you should take protective actions.
Wind Direction
UPWIND DOWNWIND
Protective
Action Zone
1/2 Downwind
Distance
Initial
Isolation
Zone
Downwind Distance
1/2 Downwind
Distance
Crosswind Direction(s)
Spill
Note 1: Note 2: Note 3: For factors that may change the protective action distances, see the
"Introduction to Green Tables" section.
When a product in Table 1 has the mention (when spilled in water), you
can refer to Table 2 for the list of gases produced when these materials
are spilled in water. The TIH gases indicated in Table 2 are for information
purposes only.
For the instantaneous release of the entire contents of a package (e.g., as a
result of terrorism, sabotage or catastrophic failure), the distances should
be doubled.
For more information on the material, safety precautions and mitigation procedures, call
the emergency response telephone number listed on the shipping paper or the appropriate
response agency as soon as possible.
Page 289

Page 290
TABLE 1 - INITIAL ISOLATION AND PROTECTIVE ACTION DISTANCES
— SMALL SPILLS
(From a small package or small leak from a large package)
First
ISOLATE
in all Directions
LARGE SPILLS
(From a large package or from many small packages)
Then
First
Then
PROTECT
ISOLATE
PROTECT
persons Downwind during
in all Directions
persons Downwind during
DAY NIGHT DAY NIGHT
Meters (Feet) Kilometers (Miles) Kilometers (Miles) Meters (Feet) Kilometers (Miles) Kilometers (Miles)
ID
No.
Guide
No. Name of Material
1005
1005
125
125
30 m (100 ft) 0.1 km (0.1 mi) 0.2 km (0.1 mi) Refer to Table 3
1008
1008
125
125
1016 119 Carbon monoxide, compressed 30 m (100 ft) 0.1 km (0.1 mi) 0.2 km (0.1 mi) 200 m (600 ft) 1.2 km (0.7 mi) 3.9 km (2.4 mi)
1017 124 Chlorine 60 m (200 ft) 0.3 km (0.2 mi) 1.5 km (0.9 mi) Refer to Table 3
1026 119 Cyanogen 30 m (100 ft) 0.1 km (0.1 mi) 0.4 km (0.3 mi) 60 m (200 ft) 0.3 km (0.2 mi) 1.1 km (0.7 mi)
1040
1040
Refer to Table 3
1045 124 Fluorine, compressed 30 m (100 ft) 0.1 km (0.1 mi) 0.2 km (0.1 mi) 100 m (300 ft) 0.5 km (0.3 mi) 2.3 km (1.4 mi)
1048 125 Hydrogen bromide, anhydrous 30 m (100 ft) 0.1 km (0.1 mi) 0.2 km (0.2 mi) 150 m (500 ft) 1.0 km (0.7 mi) 3.2 km (2.0 mi)
1050 125 Hydrogen chloride, anhydrous 30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi) 1051 117P Hydrogen cyanide, stabilized 60 m (200 ft) 0.2 km (0.1 mi) 0.7 km (0.4 mi) 200 m (600 ft) 0.7 km (0.5 mi) 1.8 km (1.1 mi)
1052 125 Hydrogen fluoride, anhydrous 30 m (100 ft) 0.1 km (0.1 mi) 0.5 km (0.3 mi) Ammonia, anhydrous
Anhydrous ammonia Boron trifluoride
Boron trifluoride, compressed 30 m (100 ft) 0.2 km (0.1 mi) 0.7 km (0.5 mi) 400 m (1250 ft) 2.4 km (1.5 mi) 4.7 km (2.9 mi)
Ethylene oxide
Ethylene oxide with nitrogen 30 m (100 ft) 0.1 km (0.1 mi) 0.2 km (0.2 mi) 1053
1053
119P
119P
117
117
Hydrogen sulfide
Hydrogen sulphide Dinitrogen tetroxide
Nitrogen dioxide Refer to Table 3
Refer to Table 3
30 m (100 ft) 0.1 km (0.1 mi) 0.5 km (0.3 mi) 400 m (1250 ft) 2.4 km (1.5 mi) 6.3 km (4.0 mi)
1061 118 Methylamine, anhydrous 30 m (100 ft) 0.1 km (0.1 mi) 0.2 km (0.1 mi) 200 m (600 ft) 0.6 km (0.4 mi) 2.1 km (1.3 mi)
1062 123 Methyl bromide 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 150 m (500 ft) 0.3 km (0.2 mi) 0.7 km (0.5 mi)
1064 117 Methyl mercaptan 30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi) 200 m (600 ft) 1.3 km (0.8 mi) 3.9 km (2.4 mi)
1067
1067
124
124
30 m (100 ft) 0.1 km (0.1 mi) 0.4 km (0.3 mi) 400 m (1250 ft) 1.4 km (0.9 mi) 3.3 km (2.1 mi)

1079
1079
125
125
1082
1082
119P
119P
1092 131P Acrolein, stabilized 1093 131P Acrylonitrile, stabilized 30 m (100 ft) 0.2 km (0.2 mi) 0.6 km (0.4 mi) 100 m (300 ft) 1.3 km (0.8 mi) 2.3 km (1.5 mi)
1098 131 Allyl alcohol 1135 131 Ethylene chlorohydrin 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi)
1143
1143
Sulfur dioxide
Sulphur dioxide Refrigerant gas R-1113
Trifluorochloroethylene,
stabilized
131P
131P
100 m (300 ft) 0.6 km (0.4 mi) 2.6 km (1.6 mi) Refer to Table 3
30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 60 m (200 ft) 0.4 km (0.3 mi) 0.7 km (0.5 mi)
100 m (300 ft) 1.3 km (0.8 mi) 3.5 km (2.2 mi) 600 m (2000 ft) 6.8 km (4.2 mi) 11.1 km (6.9 mi)
30 m (100 ft) 0.2 km (0.1 mi) 0.3 km (0.2 mi) 60 m (200 ft) 0.8 km (0.5 mi) 1.2 km (0.8 mi)
Crotonaldehyde
Crotonaldehyde, stabilized 30 m (100 ft) 0.1 km (0.1 mi) 0.2 km (0.1 mi) 60 m (200 ft) 0.5 km (0.3 mi) 0.7 km (0.5 mi)
1162 155 Dimethyldichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.4 km (0.2 mi) 1.2 km (0.8 mi)
1163 131 Dimethylhydrazine,
unsymmetrical 30 m (100 ft) 0.2 km (0.1 mi) 0.5 km (0.3 mi) 100 m (300 ft) 1.0 km (0.7 mi) 1.8 km (1.1 mi)
1182 155 Ethyl chloroformate 30 m (100 ft) 0.2 km (0.1 mi) 0.3 km (0.2 mi) 60 m (200 ft) 0.6 km (0.4 mi) 0.9 km (0.6 mi)
1183 139 Ethyldichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 60 m (200 ft) 0.5 km (0.3 mi) 1.5 km (0.9 mi)
1185 131P Ethyleneimine, stabilized 30 m (100 ft) 0.2 km (0.1 mi) 0.5 km (0.3 mi) 200 m (600 ft) 1.0 km (0.6 mi) 1.8 km (1.1 mi)
1196 155 Ethyltrichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.5 km (0.3 mi) 150 m (500 ft) 1.8 km (1.2 mi) 3.7 km (2.3 mi)
1238 155 Methyl chloroformate 30 m (100 ft) 0.2 km (0.2 mi) 0.5 km (0.4 mi) 150 m (500 ft) 1.2 km (0.7 mi) 2.2 km (1.4 mi)
Page 291
1069 125 Nitrosyl chloride 30 m (100 ft) 0.2 km (0.2 mi) 1.0 km (0.7 mi) 800 m (2500 ft) 4.3 km (2.7 mi) 9.6 km (6.0 mi)
1076 125 Phosgene 100 m (300 ft) 0.6 km (0.4 mi) 2.5 km (1.6 mi) 500 m (1500 ft) 3.0 km (1.9 mi) 9.5 km (5.9 mi)
1239 131 Methyl chloromethyl ether 60 m (200 ft) 0.5 km (0.3 mi) 1.5 km (1.0 mi) 300 m (1000 ft) 3.4 km (2.1 mi) 5.7 km (3.6 mi)
"+" means distance can be larger in certain atmospheric conditions TABLE 1

Page 292
TABLE 1 - INITIAL ISOLATION AND PROTECTIVE ACTION DISTANCES
— SMALL SPILLS
(From a small package or small leak from a large package)
First
ISOLATE
in all Directions
LARGE SPILLS
(From a large package or from many small packages)
Then
First
Then
PROTECT
ISOLATE
PROTECT
persons Downwind during
in all Directions
persons Downwind during
DAY NIGHT DAY NIGHT
Meters (Feet) Kilometers (Miles) Kilometers (Miles) Meters (Feet) Kilometers (Miles) Kilometers (Miles)
ID
No.
Guide
No. Name of Material
1242 139 Methyldichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 60 m (200 ft) 0.5 km (0.4 mi) 1.7 km (1.1 mi)
1244 131 Methylhydrazine 30 m (100 ft) 0.3 km (0.2 mi) 0.6 km (0.4 mi) 150 m (500 ft) 1.5 km (0.9 mi) 2.2 km (1.4 mi)
1250 155 Methyltrichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 60 m (200 ft) 0.6 km (0.4 mi) 1.9 km (1.2 mi)
1251 131P Methyl vinyl ketone, stabilized 100 m (300 ft) 0.3 km (0.2 mi) 0.7 km (0.5 mi) 800 m (2500 ft) 1.7 km (1.1 mi) 2.8 km (1.8 mi)
1259 131 Nickel carbonyl 100 m (300 ft) 1.4 km (0.9 mi) 5.2 km (3.3 mi) 1000 m (3000 ft) 11.0+ km (7.0+ mi) 11.0+ km (7.0+ mi)
1295 139 Trichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 60 m (200 ft) 0.5 km (0.3 mi) 1.5 km (0.9 mi)
1298 155 Trimethylchlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.4 km (0.2 mi) 1.0 km (0.6 mi)
1305 155P Vinyltrichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.4 km (0.3 mi) 1.3 km (0.8 mi)
1340
139
1340
139
Phosphorus pentasulfide,
free from yellow and
white phosphorus
(when spilled in water)
Phosphorus pentasulphide,
free from yellow and
white phosphorus
(when spilled in water)
30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.2 km (0.2 mi) 1.0 km (0.6 mi)
1360 139 Calcium phosphide
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.4 km (0.3 mi) 200 m (600 ft) 0.8 km (0.5 mi) 2.7 km (1.7 mi)

Page 293
1380 135 Pentaborane 60 m (200 ft) 0.6 km (0.4 mi) 2.0 km (1.3 mi) 300 m (1000 ft) 3.0 km (1.9 mi) 6.5 km (4.1 mi)
1384
1384
1384
135
135
135
Sodium dithionite
(when spilled in water)
Sodium hydrosulfite
(when spilled in water)
Sodium hydrosulphite
(when spilled in water)
1419 139 Magnesium aluminum
phosphide
(when spilled in water)
1560
1560
157
157
30 m (100 ft) 0.1 km (0.1 mi) 0.4 km (0.3 mi) 60 m (200 ft) 0.5 km (0.3 mi) 2.1 km (1.3 mi)
1390 139 Alkali metal amides
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi) 60 m (200 ft) 0.5 km (0.3 mi) 1.8 km (1.1 mi)
1397 139 Aluminum phosphide
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.7 km (0.4 mi) 400 m (1250 ft) 1.6 km (1.0 mi) 4.7 km (2.9 mi)
30 m (100 ft) 0.1 km (0.1 mi) 0.6 km (0.4 mi) 400 m (1250 ft) 1.4 km (0.9 mi) 4.1 km (2.6 mi)
1432 139 Sodium phosphide
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.4 km (0.2 mi) 300 m (1000 ft) 1.0 km (0.6 mi) 3.0 km (1.9 mi)
1510 143 Tetranitromethane 30 m (100 ft) 0.2 km (0.1 mi) 0.3 km (0.2 mi) 30 m (100 ft) 0.4 km (0.3 mi) 0.7 km (0.4 mi)
1541 156 Acetone cyanohydrin, stabilized
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 60 m (200 ft) 0.2 km (0.1 mi) 0.5 km (0.3 mi)
1556 152 Methyldichloroarsine 150 m (500 ft) 1.4 km (0.9 mi) 2.2 km (1.4 mi) 300 m (1000 ft) 4.0 km (2.5 mi) 5.8 km (3.6 mi)
Arsenic chloride
Arsenic trichloride 30 m (100 ft) 0.2 km (0.1 mi) 0.3 km (0.2 mi) 100 m (300 ft) 1.0 km (0.7 mi) 1.5 km (1.0 mi)
1569 131 Bromoacetone 30 m (100 ft) 0.4 km (0.3 mi) 1.2 km (0.8 mi) 150 m (500 ft) 1.8 km (1.1 mi) 3.3 km (2.1 mi)
1580 154 Chloropicrin 60 m (200 ft) 0.5 km (0.4 mi) 1.2 km (0.8 mi) 200 m (600 ft) 2.4 km (1.5 mi) 3.7 km (2.3 mi)
1581 123 Chloropicrin and methyl
bromide mixture 30 m (100 ft) 0.1 km (0.1 mi) 0.6 km (0.4 mi) 300 m (1000 ft) 2.1 km (1.3 mi) 5.9 km (3.7 mi)
1582 119 Chloropicrin and methyl
chloride mixture 30 m (100 ft) 0.1 km (0.1 mi) 0.5 km (0.3 mi) 60 m (200 ft) 0.5 km (0.3 mi) 2.1 km (1.3 mi)
"+" means distance can be larger in certain atmospheric conditions TABLE 1

Page 294
TABLE 1 - INITIAL ISOLATION AND PROTECTIVE ACTION DISTANCES
— SMALL SPILLS
(From a small package or small leak from a large package)
First
ISOLATE
in all Directions
LARGE SPILLS
(From a large package or from many small packages)
Then
First
Then
PROTECT
ISOLATE
PROTECT
persons Downwind during
in all Directions
persons Downwind during
DAY NIGHT DAY NIGHT
Meters (Feet) Kilometers (Miles) Kilometers (Miles) Meters (Feet) Kilometers (Miles) Kilometers (Miles)
ID
No.
Guide
No. Name of Material
1583 154 Chloropicrin mixture, n.o.s. 30 m (100 ft) 0.1 km (0.1 mi) 0.6 km (0.4 mi) 300 m (1000 ft) 2.1 km (1.3 mi) 5.9 km (3.7 mi)
1589 125 Cyanogen chloride, stabilized 300 m (1000 ft) 1.9 km (1.2 mi) 6.6 km (4.1 mi) 1000 m (3000 ft) 11.0+ km (7.0+ mi) 11.0+ km (7.0+ mi)
1595
1595
156
156
Dimethyl sulfate
Dimethyl sulphate 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 60 m (200 ft) 0.2 km (0.1 mi) 0.7 km (0.4 mi)
1605 154 Ethylene dibromide 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.1 km (0.1 mi) 0.2 km (0.1 mi)
1612 123 Hexaethyl tetraphosphate and
compressed gas mixture 100 m (300 ft) 0.8 km (0.5 mi) 2.7 km (1.7 mi) 400 m (1250 ft) 3.5 km (2.2 mi) 8.1 km (5.1 mi)
1613
154
1613
154
Hydrocyanic acid, aqueous
solution, with not more than
20% hydrogen cyanide
Hydrogen cyanide, aqueous
solution, with not more than
20% hydrogen cyanide
30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 100 m (300 ft) 0.5 km (0.3 mi) 1.1 km (0.7 mi)
1614 152 Hydrogen cyanide, stabilized
(absorbed) 60 m (200 ft) 0.2 km (0.1 mi) 0.6 km (0.4 mi) 150 m (500 ft) 0.5 km (0.3 mi) 1.5 km (1.0 mi)
1647 151 Methyl bromide and ethylene
dibromide mixture, liquid 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 150 m (500 ft) 0.3 km (0.2 mi) 0.7 km (0.5 mi)
1660 124 Nitric oxide, compressed 30 m (100 ft) 0.1 km (0.1 mi) 0.6 km (0.4 mi) 100 m (300 ft) 0.6 km (0.4 mi) 2.2 km (1.4 mi)
1670 157 Perchloromethyl mercaptan 30 m (100 ft) 0.3 km (0.2 mi) 0.4 km (0.2 mi) 100 m (300 ft) 0.8 km (0.5 mi) 1.3 km (0.8 mi)
1672 151 Phenylcarbylamine chloride 30 m (100 ft) 0.2 km (0.1 mi) 0.2 km (0.1 mi) 60 m (200 ft) 0.5 km (0.3 mi) 0.7 km (0.4 mi)
1680 157 Potassium cyanide, solid
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 60 m (200 ft) 0.2 km (0.1 mi) 0.7 km (0.4 mi)

Page 295
1689 157 Sodium cyanide, solid
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 60 m (200 ft) 0.2 km (0.2 mi) 0.9 km (0.6 mi)
1695 131 Chloroacetone, stabilized 30 m (100 ft) 0.1 km (0.1 mi) 0.2 km (0.1 mi) 60 m (200 ft) 0.4 km (0.3 mi) 0.6 km (0.4 mi)
1716 156 Acetyl bromide
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.2 km (0.2 mi) 0.7 km (0.4 mi)
1717 155 Acetyl chloride
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 60 m (200 ft) 0.7 km (0.4 mi) 2.0 km (1.2 mi)
Allyl chlorocarbonate
Allyl chloroformate 1741 125 Boron trichloride
(when spilled on land) 30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi) 100 m (300 ft) 0.6 km (0.4 mi) 1.3 km (0.8 mi)
1741 125 Boron trichloride
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.2 km (0.2 mi) 100 m (300 ft) 0.9 km (0.6 mi) 2.8 km (1.7 mi)
1744
1744
1744
1722
1722
155
155
Bromine
Bromine, solution
Bromine, solution
(Inhalation Hazard Zone A)
100 m (300 ft) 0.3 km (0.2 mi) 0.8 km (0.5 mi) 400 m (1250 ft) 1.5 km (0.9 mi) 2.4 km (1.5 mi)
1724 155 Allyltrichlorosilane, stabilized
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.4 km (0.2 mi) 1.2 km (0.8 mi)
1725 137 Aluminum bromide, anhydrous
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.1 km (0.1 mi) 0.2 km (0.1 mi)
1726 137 Aluminum chloride, anhydrous
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.4 km (0.2 mi) 1.5 km (1.0 mi)
1728 156 Amyltrichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.4 km (0.2 mi) 1.2 km (0.7 mi)
1732 157 Antimony pentafluoride
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi) 100 m (300 ft) 0.8 km (0.5 mi) 3.0 km (1.9 mi)
154
154
154
60 m (200 ft) 0.8 km (0.5 mi) 2.4 km (1.5 mi) 400 m (1250 ft) 4.2 km (2.6 mi) 7.6 km (4.7 mi)
"+" means distance can be larger in certain atmospheric conditions TABLE 1

Page 296
TABLE 1 - INITIAL ISOLATION AND PROTECTIVE ACTION DISTANCES
— SMALL SPILLS
(From a small package or small leak from a large package)
First
ISOLATE
in all Directions
LARGE SPILLS
(From a large package or from many small packages)
Then
First
Then
PROTECT
ISOLATE
PROTECT
persons Downwind during
in all Directions
persons Downwind during
DAY NIGHT DAY NIGHT
Meters (Feet) Kilometers (Miles) Kilometers (Miles) Meters (Feet) Kilometers (Miles) Kilometers (Miles)
ID
No.
Guide
No. Name of Material
1744 154 Bromine, solution
(Inhalation Hazard Zone B) 30 m (100 ft) 0.1 km (0.1 mi) 0.2 km (0.1 mi) 30 m (100 ft) 0.4 km (0.3 mi) 0.5 km (0.3 mi)
1745 144 Bromine pentafluoride
(when spilled on land) 100 m (300 ft) 0.9 km (0.5 mi) 2.7 km (1.7 mi) 500 m (1500 ft) 5.7 km (3.6 mi) 10.8 km (6.7 mi)
1745 144 Bromine pentafluoride
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi) 100 m (300 ft) 0.9 km (0.6 mi) 3.0 km (1.9 mi)
1746 144 Bromine trifluoride
(when spilled on land) 30 m (100 ft) 0.1 km (0.1 mi) 0.2 km (0.1 mi) 30 m (100 ft) 0.3 km (0.2 mi) 0.5 km (0.3 mi)
1746 144 Bromine trifluoride
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi) 100 m (300 ft) 0.8 km (0.5 mi) 2.8 km (1.8 mi)
1747 155 Butyltrichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.4 km (0.2 mi) 1.2 km (0.7 mi)
1749 124 Chlorine trifluoride 30 m (100 ft) 0.2 km (0.2 mi) 1.1 km (0.7 mi) 300 m (1000 ft) 1.4 km (0.9 mi) 3.7 km (2.3 mi)
1752 156 Chloroacetyl chloride
(when spilled on land) 30 m (100 ft) 0.3 km (0.2 mi) 0.6 km (0.4 mi) 100 m (300 ft) 1.2 km (0.8 mi) 1.9 km (1.2 mi)
1752 156 Chloroacetyl chloride
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.1 km (0.1 mi) 0.4 km (0.3 mi)
1753 156 Chlorophenyltrichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.2 km (0.1 mi) 0.5 km (0.4 mi)

1754
137
1754
137
Chlorosulfonic acid (with or
without sulfur trioxide)
(when spilled in water)
Chlorosulphonic acid (with
or without sulphur trioxide)
(when spilled in water)
30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 60 m (200 ft) 0.5 km (0.3 mi) 1.7 km (1.1 mi)
1758 137 Chromium oxychloride
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi)
1762 156 Cyclohexenyltrichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.2 km (0.2 mi) 0.8 km (0.5 mi)
1763 156 Cyclohexyltrichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.2 km (0.2 mi) 0.8 km (0.5 mi)
1765 156 Dichloroacetyl chloride
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.1 km (0.1 mi) 0.5 km (0.3 mi)
1766 156 Dichlorophenyltrichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.4 km (0.3 mi) 1.4 km (0.9 mi)
1767 155 Diethyldichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.2 km (0.2 mi) 0.6 km (0.4 mi)
1769 156 Diphenyldichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.2 km (0.2 mi) 0.7 km (0.5 mi)
1771 156 Dodecyltrichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.3 km (0.2 mi) 0.8 km (0.5 mi)
Page 297
1754
137
1754
137
Chlorosulfonic acid (with or
without sulfur trioxide)
(when spilled on land)
Chlorosulphonic acid (with
or without sulphur trioxide)
(when spilled on land)
30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.3 km (0.2 mi) 0.3 km (0.2 mi)
"+" means distance can be larger in certain atmospheric conditions TABLE 1

Page 298
TABLE 1 - INITIAL ISOLATION AND PROTECTIVE ACTION DISTANCES
— SMALL SPILLS
(From a small package or small leak from a large package)
First
ISOLATE
in all Directions
LARGE SPILLS
(From a large package or from many small packages)
Then
First
Then
PROTECT
ISOLATE
PROTECT
persons Downwind during
in all Directions
persons Downwind during
DAY NIGHT DAY NIGHT
Meters (Feet) Kilometers (Miles) Kilometers (Miles) Meters (Feet) Kilometers (Miles) Kilometers (Miles)
ID
No.
Guide
No. Name of Material
1777
1777
137
137
Fluorosulfonic acid
(when spilled in water)
Fluorosulphonic acid
(when spilled in water)
30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi)
1781 156 Hexadecyltrichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi)
1784 156 Hexyltrichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.3 km (0.2 mi) 0.9 km (0.6 mi)
1799 156 Nonyltrichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.3 km (0.2 mi) 1.0 km (0.6 mi)
1800 156 Octadecyltrichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.3 km (0.2 mi) 0.9 km (0.6 mi)
1801 156 Octyltrichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.3 km (0.2 mi) 1.0 km (0.6 mi)
1804 156 Phenyltrichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.3 km (0.2 mi) 1.0 km (0.6 mi)
1806 137 Phosphorus pentachloride
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.2 km (0.2 mi) 0.9 km (0.6 mi)
1808 137 Phosphorus tribromide
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.3 km (0.2 mi) 1.1 km (0.7 mi)
1809 137 Phosphorus trichloride
(when spilled on land) 30 m (100 ft) 0.2 km (0.2 mi) 0.6 km (0.4 mi) 100 m (300 ft) 1.1 km (0.7 mi) 2.0 km (1.3 mi)

Page 299
1809 137 Phosphorus trichloride
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 60 m (200 ft) 0.5 km (0.3 mi) 1.8 km (1.1 mi)
1810 137 Phosphorus oxychloride
(when spilled on land) 30 m (100 ft) 0.3 km (0.2 mi) 0.6 km (0.4 mi) 100 m (300 ft) 1.1 km (0.7 mi) 1.8 km (1.2 mi)
1810 137 Phosphorus oxychloride
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 60 m (200 ft) 0.5 km (0.3 mi) 1.5 km (1.0 mi)
1815 155 Propionyl chloride
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi)
1816 155 Propyltrichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.4 km (0.3 mi) 1.3 km (0.8 mi)
1818 157 Silicon tetrachloride
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 60 m (200 ft) 0.6 km (0.4 mi) 2.0 km (1.3 mi)
1828
1828
137
137
Sulfur chlorides
(when spilled on land)
Sulphur chlorides
(when spilled on land)
30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 60 m (200 ft) 0.3 km (0.2 mi) 0.4 km (0.3 mi)
1828
1828
137
137
Sulfur chlorides
(when spilled in water)
Sulphur chlorides
(when spilled in water)
30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.2 km (0.1 mi) 0.7 km (0.4 mi)
1829
1829
137
137
Sulfur trioxide, stabilized
Sulphur trioxide, stabilized 60 m (200 ft) 0.4 km (0.2 mi) 1.0 km (0.6 mi) 300 m (1000 ft) 2.9 km (1.8 mi) 6.3 km (4.0 mi)
1831
1831
137
137
Sulfuric acid, fuming
Sulphuric acid, fuming 60 m (200 ft) 0.4 km (0.2 mi) 1.0 km (0.6 mi) 300 m (1000 ft) 2.9 km (1.8 mi) 6.3 km (4.0 mi)
1834
1834
137
137
Sulfuryl chloride
(when spilled on land)
Sulphuryl chloride
(when spilled on land)
30 m (100 ft) 0.2 km (0.1 mi) 0.4 km (0.3 mi) 60 m (200 ft) 0.8 km (0.5 mi) 1.5 km (0.9 mi)
"+" means distance can be larger in certain atmospheric conditions TABLE 1

Page 300
TABLE 1 - INITIAL ISOLATION AND PROTECTIVE ACTION DISTANCES
— SMALL SPILLS
(From a small package or small leak from a large package)
First
ISOLATE
in all Directions
LARGE SPILLS
(From a large package or from many small packages)
Then
First
Then
PROTECT
ISOLATE
PROTECT
persons Downwind during
in all Directions
persons Downwind during
DAY NIGHT DAY NIGHT
Meters (Feet) Kilometers (Miles) Kilometers (Miles) Meters (Feet) Kilometers (Miles) Kilometers (Miles)
ID
No.
Guide
No. Name of Material
1834
1834
137
137
Sulfuryl chloride
(when spilled in water)
Sulphuryl chloride
(when spilled in water)
30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.3 km (0.2 mi) 1.1 km (0.7 mi)
1836 137 Thionyl chloride
(when spilled on land) 30 m (100 ft) 0.1 km (0.1 mi) 0.2 km (0.2 mi) 30 m (100 ft) 0.3 km (0.2 mi) 0.5 km (0.4 mi)
1836 137 Thionyl chloride
(when spilled in water) 100 m (300 ft) 0.9 km (0.6 mi) 2.9 km (1.8 mi) 600 m (2000 ft) 7.6 km (4.7 mi) 11.0+ km (7.0+ mi)
1838 137 Titanium tetrachloride
(when spilled on land) 30 m (100 ft) 0.1 km (0.1 mi) 0.2 km (0.1 mi) 30 m (100 ft) 0.4 km (0.3 mi) 0.5 km (0.3 mi)
1838 137 Titanium tetrachloride
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.3 km (0.2 mi) 1.2 km (0.7 mi)
1859
1859
125
125
Silicon tetrafluoride
Silicon tetrafluoride,
compressed
30 m (100 ft) 0.2 km (0.1 mi) 0.8 km (0.5 mi) 100 m (300 ft) 0.5 km (0.3 mi) 1.8 km (1.2 mi)
1892 151 Ethyldichloroarsine 150 m (500 ft) 1.5 km (1.0 mi) 2.2 km (1.4 mi) 400 m (1250 ft) 5.1 km (3.2 mi) 6.4 km (4.0 mi)
1898 156 Acetyl iodide
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.3 km (0.2 mi) 0.9 km (0.6 mi)
1911
1911
119
119
Diborane
Diborane mixtures 60 m (200 ft) 0.3 km (0.2 mi) 1.2 km (0.7 mi) 300 m (1000 ft) 1.6 km (1.0 mi) 4.6 km (2.9 mi)

Page 301
1923
1923
1923
135
135
135
Calcium dithionite
(when spilled in water)
Calcium hydrosulfite
(when spilled in water)
Calcium hydrosulphite
(when spilled in water)
30 m (100 ft) 0.1 km (0.1 mi) 0.4 km (0.3 mi) 60 m (200 ft) 0.5 km (0.4 mi) 2.1 km (1.3 mi)
1929
1929
1929
135
135
135
Potassium dithionite
(when spilled in water)
Potassium hydrosulfite
(when spilled in water)
Potassium hydrosulphite
(when spilled in water)
30 m (100 ft) 0.1 km (0.1 mi) 0.4 km (0.2 mi) 60 m (200 ft) 0.5 km (0.3 mi) 1.9 km (1.2 mi)
1931
1931
1931
171
171
171
Zinc dithionite
(when spilled in water)
Zinc hydrosulfite
(when spilled in water)
Zinc hydrosulphite
(when spilled in water)
30 m (100 ft) 0.1 km (0.1 mi) 0.4 km (0.2 mi) 60 m (200 ft) 0.5 km (0.3 mi) 1.9 km (1.2 mi)
1953
1953
119
119
Compressed gas, poisonous,
flammable, n.o.s.
Compressed gas, poisonous,
flammable, n.o.s.
(Inhalation Hazard Zone A)
150 m (500 ft) 1.0 km (0.6 mi) 3.9 km (2.4 mi) 1000 m (3000 ft) 6.2 km (3.9 mi) 10.5 km (6.5 mi)
1953 119 Compressed gas, poisonous,
flammable, n.o.s.
(Inhalation Hazard Zone B)
30 m (100 ft) 0.1 km (0.1 mi) 0.4 km (0.2 mi) 300 m (1000 ft) 1.4 km (0.9 mi) 3.1 km (1.9 mi)
1953
119
1953
119
Compressed gas, poisonous,
flammable, n.o.s.
(Inhalation Hazard Zone C)
Compressed gas, poisonous,
flammable, n.o.s.
(Inhalation Hazard Zone D)
30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi) 150 m (500 ft) 1.0 km (0.6 mi) 2.7 km (1.7 mi)
"+" means distance can be larger in certain atmospheric conditions TABLE 1

Page 302
TABLE 1 - INITIAL ISOLATION AND PROTECTIVE ACTION DISTANCES
— SMALL SPILLS
(From a small package or small leak from a large package)
First
ISOLATE
in all Directions
LARGE SPILLS
(From a large package or from many small packages)
Then
First
Then
PROTECT
ISOLATE
PROTECT
persons Downwind during
in all Directions
persons Downwind during
DAY NIGHT DAY NIGHT
Meters (Feet) Kilometers (Miles) Kilometers (Miles) Meters (Feet) Kilometers (Miles) Kilometers (Miles)
ID
No.
Guide
No. Name of Material
1953
1953
119
119
Compressed gas, toxic,
flammable, n.o.s.
Compressed gas, toxic,
flammable, n.o.s.
(Inhalation Hazard Zone A)
150 m (500 ft) 1.0 km (0.6 mi) 3.9 km (2.4 mi) 1000 m (3000 ft) 6.2 km (3.9 mi) 10.5 km (6.5 mi)
1953 119 Compressed gas, toxic,
flammable, n.o.s.
(Inhalation Hazard Zone B)
30 m (100 ft) 0.1 km (0.1 mi) 0.4 km (0.2 mi) 300 m (1000 ft) 1.4 km (0.9 mi) 3.1 km (1.9 mi)
1953
119
1953
119
Compressed gas, toxic,
flammable, n.o.s.
(Inhalation Hazard Zone C)
Compressed gas, toxic,
flammable, n.o.s.
(Inhalation Hazard Zone D)
30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi) 150 m (500 ft) 1.0 km (0.6 mi) 2.7 km (1.7 mi)
1955
1955
123
123
Compressed gas,
poisonous, n.o.s.
Compressed gas,
poisonous, n.o.s.
(Inhalation Hazard Zone A)
150 m (500 ft) 1.0 km (0.6 mi) 3.9 km (2.4 mi) 1000 m (3000 ft) 6.2 km (3.9 mi) 10.5 km (6.5 mi)
1955 123 Compressed gas,
poisonous, n.o.s.
(Inhalation Hazard Zone B)
30 m (100 ft) 0.2 km (0.2 mi) 1.1 km (0.7 mi) 300 m (1000 ft) 1.4 km (0.9 mi) 3.7 km (2.3 mi)

Page 303
1955
123
1955
123
Compressed gas,
poisonous, n.o.s.
(Inhalation Hazard Zone C)
Compressed gas,
poisonous, n.o.s.
(Inhalation Hazard Zone D)
30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi) 150 m (500 ft) 1.0 km (0.6 mi) 2.7 km (1.7 mi)
1955
1955
123
123
Compressed gas, toxic, n.o.s.
Compressed gas, toxic, n.o.s.
(Inhalation Hazard Zone A)
150 m (500 ft) 1.0 km (0.6 mi) 3.9 km (2.4 mi) 1000 m (3000 ft) 6.2 km (3.9 mi) 10.5 km (6.5 mi)
1955 123 Compressed gas, toxic, n.o.s.
(Inhalation Hazard Zone B) 30 m (100 ft) 0.2 km (0.2 mi) 1.1 km (0.7 mi) 300 m (1000 ft) 1.4 km (0.9 mi) 3.7 km (2.3 mi)
1955
1955
123
123
Compressed gas, toxic, n.o.s.
(Inhalation Hazard Zone C)
Compressed gas, toxic, n.o.s.
(Inhalation Hazard Zone D)
30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi) 150 m (500 ft) 1.0 km (0.6 mi) 2.7 km (1.7 mi)
1955
1955
1955
123
123
123
Organic phosphate compound
mixed with compressed gas
Organic phosphate mixed with
compressed gas
Organic phosphorus compound
mixed with compressed gas
100 m (300 ft) 1.0 km (0.7 mi) 3.4 km (2.1 mi) 500 m (1500 ft) 4.4 km (2.7 mi) 9.6 km (6.0 mi)
1967
1967
1967
123
123
123
Insecticide gas, poisonous,
n.o.s.
Insecticide gas, toxic, n.o.s.
Parathion and compressed gas
mixture
100 m (300 ft) 1.0 km (0.7 mi) 3.4 km (2.1 mi) 500 m (1500 ft) 4.4 km (2.7 mi) 9.6 km (6.0 mi)
1975
1975
124
124
Nitric oxide and dinitrogen
tetroxide mixture
Nitric oxide and nitrogen
dioxide mixture
30 m (100 ft) 0.1 km (0.1 mi) 0.6 km (0.4 mi) 100 m (300 ft) 0.6 km (0.4 mi) 2.2 km (1.4 mi)
1994 136 Iron pentacarbonyl 100 m (300 ft) 0.9 km (0.6 mi) 2.1 km (1.3 mi) 400 m (1250 ft) 5.2 km (3.2 mi) 7.8 km (4.8 mi)
"+" means distance can be larger in certain atmospheric conditions TABLE 1

Page 304
TABLE 1 - INITIAL ISOLATION AND PROTECTIVE ACTION DISTANCES
— SMALL SPILLS
(From a small package or small leak from a large package)
First
ISOLATE
in all Directions
LARGE SPILLS
(From a large package or from many small packages)
Then
First
Then
PROTECT
ISOLATE
PROTECT
persons Downwind during
in all Directions
persons Downwind during
DAY NIGHT DAY NIGHT
Meters (Feet) Kilometers (Miles) Kilometers (Miles) Meters (Feet) Kilometers (Miles) Kilometers (Miles)
ID
No.
Guide
No. Name of Material
2004 135 Magnesium diamide
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi) 60 m (200 ft) 0.5 km (0.3 mi) 1.8 km (1.1 mi)
2011 139 Magnesium phosphide
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.6 km (0.4 mi) 400 m (1250 ft) 1.4 km (0.9 mi) 3.9 km (2.4 mi)
2012 139 Potassium phosphide
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi) 200 m (600 ft) 0.9 km (0.6 mi) 2.8 km (1.8 mi)
2013 139 Strontium phosphide
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi) 200 m (600 ft) 0.8 km (0.5 mi) 2.7 km (1.7 mi)
2032 157 Nitric acid, red fuming 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 150 m (500 ft) 0.3 km (0.2 mi) 0.5 km (0.3 mi)
2186 125 Hydrogen chloride,
refrigerated liquid 30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi) Refer to Table 3
2188 119 Arsine 150 m (500 ft) 1.0 km (0.6 mi) 3.9 km (2.4 mi) 1000 m (3000 ft) 6.2 km (3.9 mi) 10.5 km (6.5 mi)
2189 119 Dichlorosilane 30 m (100 ft) 0.1 km (0.1 mi) 0.4 km (0.2 mi) 300 m (1000 ft) 1.4 km (0.9 mi) 3.1 km (1.9 mi)
2190 124 Oxygen difluoride, compressed 300 m (1000 ft) 1.8 km (1.1 mi) 7.2 km (4.5 mi) 1000 m (3000 ft) 11.0+ km (7.0+ mi) 11.0+ km (7.0+ mi)
2191
2191
123
123
Sulfuryl fluoride
Sulphuryl fluoride 30 m (100 ft) 0.1 km (0.1 mi) 0.5 km (0.3 mi) 400 m (1250 ft) 2.2 km (1.4 mi) 5.0 km (3.1 mi)
2192 119 Germane 150 m (500 ft) 0.9 km (0.5 mi) 3.3 km (2.1 mi) 600 m (2000 ft) 3.6 km (2.3 mi) 7.4 km (4.6 mi)
2194 125 Selenium hexafluoride 200 m (600 ft) 1.1 km (0.7 mi) 3.4 km (2.1 mi) 600 m (2000 ft) 3.9 km (2.4 mi) 7.6 km (4.8 mi)
2195 125 Tellurium hexafluoride 1000 m (3000 ft) 5.9 km (3.7 mi) 11.1 km (6.9 mi) 1000 m (3000 ft) 11.0+ km (7.0+ mi) 11.0+ km (7.0+ mi)
2196 125 Tungsten hexafluoride 30 m (100 ft) 0.2 km (0.1 mi) 0.8 km (0.5 mi) 150 m (500 ft) 0.8 km (0.5 mi) 2.8 km (1.7 mi)
2197 125 Hydrogen iodide, anhydrous 30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi) 150 m (500 ft) 1.0 km (0.6 mi) 2.7 km (1.7 mi)

Page 305
2198
2198
125
125
Phosphorus pentafluoride
Phosphorus pentafluoride,
compressed
30 m (100 ft) 0.2 km (0.2 mi) 1.0 km (0.7 mi) 200 m (600 ft) 1.1 km (0.7 mi) 3.5 km (2.2 mi)
2199 119 Phosphine 60 m (200 ft) 0.3 km (0.2 mi) 1.1 km (0.7 mi) 400 m (1250 ft) 1.3 km (0.8 mi) 3.7 km (2.3 mi)
2202 117 Hydrogen selenide, anhydrous 300 m (1000 ft) 1.7 km (1.1 mi) 6.0 km (3.7 mi) 1000 m (3000 ft) 11.0+ km (7.0+ mi) 11.0+ km (7.0+ mi)
2204
2204
119
119
2232
2232
153
153
2308
2308
157
157
2334 131 Allylamine Carbonyl sulfide
Carbonyl sulphide Chloroacetaldehyde
2-Chloroethanal Nitrosylsulfuric acid, liquid
(when spilled in water)
Nitrosylsulphuric acid, liquid
(when spilled in water)
2418
2418
125
125
30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi) 300 m (1000 ft) 1.5 km (1.0 mi) 3.6 km (2.3 mi)
30 m (100 ft) 0.2 km (0.1 mi) 0.3 km (0.2 mi) 60 m (200 ft) 0.7 km (0.4 mi) 1.1 km (0.7 mi)
2285 155 Isocyanatobenzotrifluorides 30 m (100 ft) 0.2 km (0.1 mi) 0.2 km (0.1 mi) 60 m (200 ft) 0.5 km (0.3 mi) 0.6 km (0.4 mi)
30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi) 300 m (1000 ft) 0.8 km (0.5 mi) 2.3 km (1.4 mi)
30 m (100 ft) 0.2 km (0.1 mi) 0.5 km (0.4 mi) 150 m (500 ft) 1.6 km (1.0 mi) 2.5 km (1.6 mi)
2337 131 Phenyl mercaptan 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.3 km (0.2 mi) 0.4 km (0.2 mi)
2353 155 Butyryl chloride
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.2 km (0.1 mi) 0.5 km (0.3 mi)
2382 131 Dimethylhydrazine,
symmetrical 30 m (100 ft) 0.2 km (0.1 mi) 0.3 km (0.2 mi) 60 m (200 ft) 0.8 km (0.5 mi) 1.3 km (0.8 mi)
2395 155 Isobutyryl chloride
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi)
2407 155 Isopropyl chloroformate 30 m (100 ft) 0.1 km (0.1 mi) 0.2 km (0.2 mi) 60 m (200 ft) 0.5 km (0.4 mi) 0.9 km (0.6 mi)
2417 125 Carbonyl fluoride 100 m (300 ft) 0.7 km (0.5 mi) 2.5 km (1.6 mi) 600 m (2000 ft) 3.8 km (2.4 mi) 8.2 km (5.1 mi)
Sulfur tetrafluoride
Sulphur tetrafluoride 100 m (300 ft) 0.5 km (0.3 mi) 2.4 km (1.5 mi) 400 m (1250 ft) 2.4 km (1.5 mi) 5.9 km (3.7 mi)
2420 125 Hexafluoroacetone 100 m (300 ft) 0.7 km (0.4 mi) 2.7 km (1.7 mi) 1000 m (3000 ft) 11.0+ km (7.0+ mi) 11.0+ km (7.0+ mi)
"+" means distance can be larger in certain atmospheric conditions TABLE 1

Page 306
TABLE 1 - INITIAL ISOLATION AND PROTECTIVE ACTION DISTANCES
— SMALL SPILLS
(From a small package or small leak from a large package)
First
ISOLATE
in all Directions
LARGE SPILLS
(From a large package or from many small packages)
Then
First
Then
PROTECT
ISOLATE
PROTECT
persons Downwind during
in all Directions
persons Downwind during
DAY NIGHT DAY NIGHT
Meters (Feet) Kilometers (Miles) Kilometers (Miles) Meters (Feet) Kilometers (Miles) Kilometers (Miles)
ID
No.
Guide
No. Name of Material
2421 124 Nitrogen trioxide 60 m (200 ft) 0.3 km (0.2 mi) 1.2 km (0.8 mi) 200 m (600 ft) 1.4 km (0.9 mi) 4.3 km (2.7 mi)
2434 156 Dibenzyldichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.1 km (0.1 mi) 0.3 km (0.2 mi)
2435 156 Ethylphenyldichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.2 km (0.1 mi) 0.6 km (0.4 mi)
2437 156 Methylphenyldichlorosilane
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.2 km (0.2 mi) 0.8 km (0.5 mi)
2438 131 Trimethylacetyl chloride 60 m (200 ft) 0.5 km (0.3 mi) 1.0 km (0.7 mi) 200 m (600 ft) 2.3 km (1.5 mi) 3.3 km (2.1 mi)
2442 156 Trichloroacetyl chloride 30 m (100 ft) 0.2 km (0.1 mi) 0.3 km (0.2 mi) 60 m (200 ft) 0.7 km (0.5 mi) 1.1 km (0.7 mi)
2474 156 Thiophosgene 60 m (200 ft) 0.6 km (0.4 mi) 1.8 km (1.1 mi) 200 m (600 ft) 2.3 km (1.4 mi) 4.2 km (2.6 mi)
2477 131 Methyl isothiocyanate 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.3 km (0.2 mi) 0.4 km (0.3 mi)
2478
2478
2478
2478
155
155
155
155
Isocyanate solution, flammable,
poisonous, n.o.s.
Isocyanate solution, flammable,
toxic, n.o.s.
Isocyanates, flammable,
poisonous, n.o.s.
Isocyanates, flammable, toxic,
n.o.s.
60 m (200 ft) 0.8 km (0.5 mi) 1.8 km (1.2 mi) 400 m (1250 ft) 4.7 km (3.0 mi) 7.0 km (4.4 mi)
2480 155P Methyl isocyanate 150 m (500 ft) 1.7 km (1.1 mi) 5.2 km (3.3 mi) 1000 m (3000 ft) 11.0+ km (7.0+ mi) 11.0+ km (7.0+ mi)
2481 155 Ethyl isocyanate 150 m (500 ft) 2.0 km (1.3 mi) 5.3 km (3.3 mi) 1000 m (3000 ft) 11.0+ km (7.0+ mi) 11.0+ km (7.0+ mi)
2482 155P n-Propyl isocyanate 100 m (300 ft) 1.3 km (0.8 mi) 2.8 km (1.8 mi) 600 m (2000 ft) 7.8 km (4.8 mi) 10.7 km (6.6 mi)

2676 119 Stibine 60 m (200 ft) 0.3 km (0.2 mi) 1.6 km (1.0 mi) 200 m (600 ft) 1.3 km (0.8 mi) 4.1 km (2.6 mi)
2691 137 Phosphorus pentabromide
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.1 km (0.1 mi) 0.4 km (0.3 mi)
2692 157 Boron tribromide
(when spilled on land) 30 m (100 ft) 0.1 km (0.1 mi) 0.2 km (0.1 mi) 30 m (100 ft) 0.2 km (0.1 mi) 0.4 km (0.3 mi)
2692 157 Boron tribromide
(when spilled in water) 30 m (100 ft) 0.1 km (0.1 mi) 0.1 km (0.1 mi) 30 m (100 ft) 0.4 km (0.3 mi) 1.4 km (0.9 mi)
Page 307
2483 155P Isopropyl isocyanate 150 m (500 ft) 1.5 km (1.0 mi) 3.3 km (2.1 mi) 1000 m (3000 ft) 11.0+ km (7.0+ mi) 11.0+ km (7.0+ mi)
2484 155 tert-Butyl isocyanate 60 m (200 ft) 0.8 km (0.5 mi) 1.8 km (1.2 mi) 400 m (1250 ft) 4.7 km (3.0 mi) 7.0 km (4.4 mi)
2485 155P n-Butyl isocyanate 60 m (200 ft) 0.6 km (0.4 mi) 1.2 km (0.8 mi) 300 m (1000 ft) 2.9 km (1.8 mi) 4.2 km (2.6 mi)
2486 155P Isobutyl isocyanate 60 m (200 ft) 0.6 km (0.4 mi) 1.3 km (0.8 mi) 300 m (1000 ft) 3.4 km (2.1 mi) 4.8 km (3.0 mi)
2487 155 Phenyl isocyanate 100 m (300 ft) 0.9 km (0.6 mi) 1.5 km (0.9 mi) 400 m (1250 ft) 4.2 km (2.6 mi) 5.4 km (3.4 mi)
2488 155 Cyclohexyl isocyanate 30 m (100 ft) 0.3 km (0.2 mi) 0.4 km (0.3 mi) 100 m (300 ft) 1.1 km (0.7 mi) 1.4 km (0.9 mi)
2495 144 Iodine pentafl
- **truncated:** true
- **body characters:** 82765