Ethylene Oxide

CAS RN: 75-21-8
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Protective Distance

IF THERE IS A FIRE, or IF A FIRE IS INVOLVED, go directly to the ERG guide page and use the evacuation information shown under PUBLIC SAFETY.

Initial Isolation and Protective Action Distances
ID MATERIAL Small Spills
(From a small package or small leak from a large package)		 Large Spills
(From a large package or many small packages)
First ISOLATE in all Directions Then PROTECT Downwind First ISOLATE in all Directions Then PROTECT Downwind
Day Night Day Night
1040 Ethylene oxide with Nitrogen
Ethylene oxide		 100 ft 0.1 mi 0.2 mi See Table 3 Below

UN1040 Ethylene oxide: Large Spills
UN1040 Ethylene oxide with Nitrogen: Large Spills

Rail tank car
Highway tank truck or trailer
Multiple small cylinders or single ton cylinder
Transport container Rail tank car
First ISOLATE in all Directions 600 ft
Then PROTECT downwind
DAY
Low Wind
(< 6 mph) 		Moderate Wind
(6 - 12 mph) 		High Wind
(> 12 mph)

1 mi

0.5 mi

0.5 mi
NIGHT
Low Wind
(< 6 mph) 		Moderate Wind
(6 - 12 mph) 		High Wind
(> 12 mph)

2.1 mi

0.9 mi

0.5 mi
Transport container Highway tank truck or trailer
First ISOLATE in all Directions 300 ft
Then PROTECT downwind
DAY
Low Wind
(< 6 mph) 		Moderate Wind
(6 - 12 mph) 		High Wind
(> 12 mph)

0.6 mi

0.3 mi

0.3 mi
NIGHT
Low Wind
(< 6 mph) 		Moderate Wind
(6 - 12 mph) 		High Wind
(> 12 mph)

1.3 mi

0.4 mi

0.3 mi
Transport container Multiple small cylinders or single ton cylinder
First ISOLATE in all Directions 100 ft
Then PROTECT downwind
DAY
Low Wind
(< 6 mph) 		Moderate Wind
(6 - 12 mph) 		High Wind
(> 12 mph)

0.3 mi

0.1 mi

0.1 mi
NIGHT
Low Wind
(< 6 mph) 		Moderate Wind
(6 - 12 mph) 		High Wind
(> 12 mph)

0.6 mi

0.2 mi

0.1 mi

To plot a protective action distance, first specify a location and wind direction below. Once a distance is plotted, you can drag the spill or right click the map to move the spill to a new location.
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Wind Direction
Select the direction of the wind at your location.
Wind Rose Wind Arrow
 
 
 
     
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