Tetrahydrofuran |
Synonyms & Trade Names Diethylene oxide; 1,4-Epoxybutane; Tetramethylene oxide; THF |
CAS No. 109-99-9 |
RTECS No. LU5950000 |
DOT ID & Guide 2056 127 |
FormulaC4H8O |
Conversion 1 ppm = 2.95 mg/m3 |
IDLH 2000 ppm [10%LEL]
See: 109999 |
Exposure Limits NIOSH REL: TWA 200 ppm (590 mg/m3) ST 250 ppm (735 mg/m3)
OSHA PEL†: TWA 200 ppm (590 mg/m3) |
Measurement Methods
NIOSH 1609 , 3800;
OSHA 7
See: NMAM or OSHA Methods |
Physical Description Colorless liquid with an ether-like odor. |
MW: 72.1 |
BP: 151°F |
FRZ: -163°F |
Sol: Miscible |
VP: 132 mmHg |
IP: 9.45 eV |
Sp.Gr: 0.89 |
Fl.P: 6°F |
UEL: 11.8% |
LEL: 2% |
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| Class IB Flammable Liquid: Fl.P. below 73°F and BP at or above 100°F. |
Incompatibilities & Reactivities Strong oxidizers, lithium-aluminum alloys [Note: Peroxides may accumulate upon prolonged storage in presence of air.] |
Exposure Routes inhalation, skin and/or eye contact, ingestion |
Symptoms irritation eyes, upper respiratory system; nausea, dizziness, headache, central nervous system depression |
Target Organs Eyes, respiratory system, central nervous system |
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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
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First Aid (See procedures)
Eye: Irrigate immediately
Skin: Water flush promptly
Breathing: Respiratory support
Swallow: Medical attention immediately |
Respirator Recommendations NIOSH/OSHA Up to 2000 ppm:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode£
(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 = 25) Any powered, air-purifying respirator with 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 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: 0578
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