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Emergency Response Guidebook (ERG)

This is an online version of the 2008 Emergency Response Guidebook (ERG) which is produced by the USDOT for first responders during the initial phase of a Dangerous goods/Hazardous Materials incident. Have you ever wondered what those four digit numbers on the placards on the side of trucks and rail cars mean? Our online ERG will give you your answer.

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Table of Isolation and Protective Action Distances

UN Number Rage

[1005-1082 | 1092-1582 | 1583-1752 | 1754-1834 | 1836-1953]
[1955-2199 | 2202-2806 | 2810-2978 | 2985-3162 | 3246-3306]
[3307-9279]

UN# 1092 - 1582

Isolation and Protective Action Distances Table
		SMALL SPILLS						LARGE SPILLS
UN#	Name of Material	First ISOLATE in all Directions		Then PROTECT Persons Downwind During-				First ISOLATE in all Directions		Then PROTECT Persons Downwind During-
		First ISOLATE in all Directions		Day		Night		First ISOLATE in all Directions		Day		Night
		m	ft	km	mi	km	mi	m	ft	km	mi	km	mi
Please see: How to use the table of initial isolation and protective action distances Current as of: Oct. 2, 2011
1092	Acrolein, stabilized	100	300	1.1	0.7	3.3	2	1000	3000	11+	7+	11+	7+
1098	Allyl alcohol	30	100	0.1	0.1	0.2	0.1	60	200	0.6	0.4	1.1	0.7
1135	Ethylene chlorohydrin	30	100	0.2	0.1	0.3	0.2	60	200	0.7	0.5	1.2	0.7
1135	Ethylene chlorohydrin	30	100	0.2	0.1	0.3	0.2	60	200	0.7	0.5	1.2	0.7
1143	Crotonaldehyde	30	100	0.1	0.1	0.1	0.1	60	200	0.4	0.3	0.7	0.5
1143	Crotonaldehyde, stabilized	30	100	0.1	0.1	0.1	0.1	60	200	0.4	0.3	0.7	0.5
1162	Dimethyldichlorosilane	30	100	0.1	0.1	0.3	0.2	60	200	0.6	0.4	2	1.3
1163	1, 1-Dimethylhydrazine	30	100	0.2	0.1	0.5	0.4	100	300	1.3	0.8	2.4	1.5
1163	Dimethylhydrazine, unsymmetrical	30	100	0.2	0.1	0.5	0.4	100	300	1.3	0.8	2.4	1.5
1182	Ethyl chloroformate	30	100	0.1	0.1	0.2	0.1	60	200	0.4	0.3	0.7	0.4
1183	Ethyldichlorosilane	30	100	0.1	0.1	0.3	0.2	60	200	0.7	0.4	2.2	1.4
1185	Ethyleneimine, stabilized	30	100	0.2	0.1	0.5	0.3	100	300	1.1	0.7	2.2	1.4
1196	Ethyltrichlorosilane	30	100	0.1	0.1	0.3	0.2	300	1000	0.8	0.5	2.7	1.7
1238	Methyl chloroformate	30	100	0.2	0.2	0.6	0.4	150	500	1.2	0.8	2.5	1.6
1238	Methyl chloroformate	30	100	0.2	0.2	0.6	0.4	150	500	1.2	0.8	2.5	1.6
1239	Methyl chloromethyl ether	30	100	0.3	0.2	1.1	0.7	200	600	2.5	1.5	5.1	3.2
1242	Methyldichlorosilane	30	100	0.1	0.1	0.3	0.2	60	200	0.8	0.5	2.5	1.6
1244	Methylhydrazine	30	100	0.3	0.2	0.7	0.4	150	500	1.5	1	2.5	1.5
1244	Methylhydrazine	30	100	0.3	0.2	0.7	0.4	150	500	1.5	1	2.5	1.5
1250	Methyltrichlorosilane	30	100	0.1	0.1	0.2	0.2	60	200	0.6	0.4	2	1.3
1250	Methyltrichlorosilane	30	100	0.1	0.1	0.2	0.2	60	200	0.6	0.4	2	1.3
1251	Methyl vinyl ketone, stabilized	150	500	1.6	1.0	3.6	2.3	1000	3000	11+	7+	11+	7+
1259	Nickel carbonyl	150	500	1.4	0.9	4.9	3.1	1000	3000	11+	7+	11+	7+
1295	Trichlorosilane	30	100	0.1	0.1	0.3	0.2	60	200	0.7	0.5	2.3	1.4
1298	Trimethylchlorosilane	30	100	0.1	0.1	0.1	0.1	30	100	0.4	0.3	1.2	0.7
1298	Trimethylchlorosilane	30	100	0.1	0.1	0.1	0.1	30	100	0.4	0.3	1.2	0.7
1305	Vinyltrichlorosilane	30	100	0.1	0.1	0.2	0.2	60	200	0.6	0.4	2	1.3
1305	Vinyltrichlorosilane, stabilized	30	100	0.1	0.1	0.2	0.2	60	200	0.6	0.4	2	1.3
1340	Phosphorus pentasulfide, free from yellow and white Phosphorus	30	100	0.1	0.1	0.2	0.1	60	200	0.4	0.2	1.5	0.9
1340	Phosphorus pentasulphide, free from yellow and white Phosphorus	30	100	0.1	0.1	0.2	0.1	60	200	0.4	0.2	1.5	0.9
1360	Calcium phosphide	60	200	0.4	0.2	1.5	0.9	500	1500	4.4	2.8	11+	7+
1380	Pentaborane	60	200	0.7	0.4	2.3	1.4	400	1250	4.6	2.9	8.9	5.5
1384	Sodium dithionite	30	100	0.1	0.1	0.2	0.1	30	100	0.3	0.2	1.2	0.7
1384	Sodium hydrosulfite	30	100	0.1	0.1	0.2	0.1	30	100	0.3	0.2	1.2	0.7
1384	Sodium hydrosulphite	30	100	0.1	0.1	0.2	0.1	30	100	0.3	0.2	1.2	0.7
1397	Aluminum phosphide	60	200	0.5	0.3	1.9	1.2	600	2000	5.7	3.6	11+	7+
1412	Lithium amide	30	100	0.1	0.1	0.1	0.1	30	100	0.3	0.2	1	0.6
1419	Magnesium aluminum phosphide	60	200	0.4	0.3	1.7	1.1	600	2000	5.3	3.3	11+	7+
1432	Sodium phosphide	30	100	0.3	0.2	1.2	0.8	400	1250	3.5	2.2	10.6	6.6
1510	Tetranitromethane	30	100	0.2	0.2	0.4	0.2	60	200	0.6	0.4	1	0.6
1541	Acetone cyanohydrin, stabilized	30	100	0.1	0.1	0.1	0.1	100	300	0.3	0.2	1	0.7
1556	MD	30	100	0.2	0.1	0.5	0.4	150	500	0.7	0.4	2.2	1.4
1556	Methyldichloroarsine	30	100	0.2	0.1	0.2	0.2	60	200	0.5	0.3	0.8	0.5
1556	PD	30	100	0.1	0.1	0.1	0.1	30	100	0.2	0.1	0.2	0.1
1560	Arsenic chloride	30	100	0.2	0.1	0.3	0.2	100	300	1.1	0.7	1.8	1.1
1560	Arsenic trichloride	30	100	0.2	0.1	0.3	0.2	100	300	1.1	0.7	1.8	1.1
1569	Bromoacetone	30	100	0.2	0.2	0.8	0.5	100	300	1.1	0.7	2.3	1.5
1580	Chloropicrin	30	100	0.4	0.3	1	0.6	150	500	1.9	1.2	3.3	2.1
1581	Chloropicrin and Methyl bromide mixture	30	100	0.1	0.1	0.6	0.4	300	1000	2.1	1.3	5.9	3.7
1581	Methyl bromide and Chloropicrin mixture	30	100	0.1	0.1	0.6	0.4	300	1000	2.1	1.3	5.9	3.7
1582	Chloropicrin and Methyl chloride mixture	30	100	0.1	0.1	0.4	0.3	60	200	0.4	0.2	1.7	1.1
1582	Methyl chloride and Chloropicrin mixture	30	100	0.1	0.1	0.4	0.3	60	200	0.4	0.2	1.7	1.1

UN Number Rage

[1005-1082 | 1092-1582 | 1583-1752 | 1754-1834 | 1836-1953]
[1955-2199 | 2202-2806 | 2810-2978 | 2985-3162 | 3246-3306]
[3307-9279]

Data Source for our online 2008 ERG

This information was compiled from the 2008 Emergency Response Guidebook (2008 ERG) which is produced by the U.S. Department of Transportation.

(Data last updated/verified: Oct. 2, 2011)

Related Resources

Guide for Handling Household Chemicals
Things you can do to make your home safer.
USDOT Hazardous Materials Table 49 CFR 172.101
An online version of the USDOT's listing of hazardous materials from 49CFR 172.101. This table can be sorted by proper shipping name, UN/NA ID and/or by primary hazard class/division.
US DOT Hazardous Materials Transportation Placards
Hazardous materials placards (DOT placards) are required when shipping hazardous materials in the United States, Canada and Mexico. These pages provide US DOT definitions for each hazmat placard.
Chemical Database
This database focuses on the most common chemical compounds used in the home and industry.

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