September 2010
NIOSH Publication Number 2010-168c

N-Ethylmorpholine

Synonyms & Trade Names
4-Ethylmorpholine
CAS No.
100-74-3
RTECS No.
QE4025000
DOT ID & Guide
Formula
C4H8ONCH2CH3
Conversion
1 ppm = 4.71 mg/m3
IDLH
100 ppm
See: 100743
Exposure Limits
NIOSH REL
: TWA 5 ppm (23 mg/m3) [skin]
OSHA PEL
†: TWA 20 ppm (94 mg/m3) [skin]
Measurement Methods

NIOSH S146 (II-3)
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
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
Personal Protection/Sanitation
(See protection codes)
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

See also: INTRODUCTION   See ICSC CARD: 0480