NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

N-Ethylmorpholine

CAS
100-74-3

C4H8ONCH2CH3

RTECS
QE4025000
Synonyms & Trade Names

4-Ethylmorpholine
DOT ID & Guide

Exposure
Limits

NIOSH REL: TWA 5 ppm (23 mg/m3) [skin]
OSHA PEL†: TWA 20 ppm (94 mg/m3) [skin]
IDLH
100 ppm See: 100743
Conversion
1 ppm = 4.71 mg/m3
Physical Description
Colorless liquid with an ammonia-like odor.
MW: 115.2
BP: 281°F
FRZ: -81°F
Sol: Miscible
VP: 6 mmHg
IP: ?

Sp.Gr: 0.90
Fl.P(oc): 90°F
UEL: ?
LEL: ?

Class IC Flammable Liquid: Fl.P. at or above 73°F and below 100°F.
Incompatibilities & Reactivities

Strong acids, strong oxidizers
Measurement Methods
NIOSH S146 (II-3)
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet (flammable)
Change: No recommendation
Provide: Eyewash (>15%), Quick drench
First Aid
(See procedures)
Eye: Irrigate immediately
Skin: Water flush promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations
NIOSH
Up to 50 ppm:
(APF = 10) Any chemical cartridge respirator with organic vapor cartridge(s)*
(APF = 10) Any supplied-air respirator*
Up to 100 ppm:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode*
(APF = 25) Any powered, air-purifying respirator with organic vapor cartridge(s)*
(APF = 50) Any chemical cartridge respirator with a full facepiece and organic vapor cartridge(s)
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister
(APF = 50) Any self-contained breathing apparatus with a full facepiece
(APF = 50) Any supplied-air respirator with a full facepiece
Emergency or planned entry into unknown concentrations or IDLH conditions:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus
Escape:
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister/Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
Irritation eyes, nose, throat; visual disturbance: corneal edema, blue-gray vision, colored haloes
Target Organs
Eyes, respiratory system
See also: INTRODUCTION