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Morpholine

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Synonyms & Trade Names
Diethylene imidoxide, Diethylene oximide, Tetrahydro-1,4-oxazine, Tetrahydro-p-oxazine
CAS No.
110-91-8
RTECS No.
QD6475000
DOT ID & Guide
2054 132
Formula
C₄H₉ON
Conversion
1 ppm = 3.56 mg/m3
IDLH
1400 ppm [10%LEL]
See: 110918
Exposure 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 G
Measurement Methods
NIOSH S150 (II-3)
See: NMAM or OSHA Methods
Physical Description
Colorless liquid with a weak, ammonia- or fish-like odor. [Note: A solid below 23°F.]
Molecular Weight
87.1
Boiling Point
264°F
Freezing Point
23°F
Solubility
Miscible
Vapor Pressure
6 mmHg
Ionization Potential
8.88 eV
Specific Gravity
1.007
Flash Point
(oc) 98°F
Upper Explosive Limit
11.2%
Lower Explosive Limit
1.4%
Class IC Flammable Liquid: Fl.P. at or above 73°F and below 100°F.
Incompatibilities & Reactivities
Strong acids, strong oxidizers, metals, nitro compounds [Note: Corrosive to metals.]
Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
irritation eyes, skin, nose, respiratory system; visual disturbance; cough; In Animals: liver, kidney damage
Target Organs
Eyes, skin, respiratory system, liver, kidneys
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 (>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

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 0302
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health