# NIOSH Pocket Guide to Chemical Hazards
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 | 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)
Personal Protection & Sanitation 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
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