Morpholine
Synonyms & Trade Names
Diethylene imidoxide, Diethylene oximide, Tetrahydro-1,4-oxazine, Tetrahydro-p-oxazineExposure Limits
NIOSH REL
TWA 20 ppm (70 mg/m3) ST 30 ppm (105 mg/m3) [skin]OSHA PEL
TWA 20 ppm (70 mg/m3) [skin] See Appendix GPhysical Description
Colorless liquid with a weak, ammonia- or fish-like odor. [Note: A solid below 23°F.]Molecular Weight
87.1Boiling Point
264°FFreezing Point
23°FSolubility
MiscibleVapor Pressure
6 mmHgIonization Potential
8.88 eVSpecific Gravity
1.007Flash Point
(oc) 98°FUpper Exposive Limit
11.2%Lower Explosive Limit
1.4%Incompatibilities & Reactivities
Strong acids, strong oxidizers, metals, nitro compounds [Note: Corrosive to metals.]Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contactSymptoms
irritation eyes, skin, nose, respiratory system; visual disturbance; cough; In Animals: liver, kidney damageTarget Organs
Eyes, skin, respiratory system, liver, kidneysPersonal 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 (>25%)
First Aid
(See procedures)Eye:Irrigate immediately
Skin:Water flush immediately
Breathing:Respiratory support
Swallow:Medical attention immediately
Respirator Recommendations
NIOSH/OSHA
Up to 500 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)£
Up to 1000 ppm:
(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 powered, air-purifying respirator with a tight-fitting facepiece and organic vapor cartridge(s)£
(APF = 50) Any self-contained breathing apparatus with a full facepiece
(APF = 50) Any supplied-air respirator with a full facepiece
Up to 1400 ppm:
(APF = 2000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
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
- Page last reviewed:April 11, 2016
- Page last updated:April 11, 2016
- Content source:
- National Institute for Occupational Safety and Health (NIOSH) Education and Information Division