Tetrahydrofuran
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CAS
109-99-9
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C4H8O
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RTECS
LU5950000
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Synonyms & Trade Names
Diethylene oxide; 1,4-Epoxybutane; Tetramethylene oxide; THF
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DOT ID & Guide
2056 / 127
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Exposure
Limits
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NIOSH REL: TWA 200 ppm (590 mg/m3) ST 250 ppm (735 mg/m3)
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OSHA PEL†: TWA 200 ppm (590 mg/m3)
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IDLH
2000 ppm [10%LEL]
See: 109999
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Conversion
1 ppm = 2.95 mg/m3
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Physical Description
Colorless liquid with an ether-like odor.
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MW: 72.1
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BP: 151°F
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FRZ: -163°F
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Sol: Miscible
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VP: 132 mmHg
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IP: 9.45 eV
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Sp.Gr: 0.89
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Fl.P: 6°F
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UEL: 11.8%
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LEL: 2%
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Class IB Flammable Liquid: Fl.P. below 73°F and BP at or above 100°F.
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Incompatibilities & Reactivities
Strong oxidizers, lithium-aluminum alloys [Note: Peroxides may accumulate upon prolonged storage in presence of air.]
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Measurement Methods
NIOSH 1609, 3800; OSHA 7
See: NMAM or OSHA Methods |
Personal Protection & Sanitation (See protection)
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
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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
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Exposure Routes
inhalation, ingestion, skin and/or eye contact
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Symptoms
Irritation eyes, upper respiratory system; nausea, dizziness, headache, central nervous system depression
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Target Organs
Eyes, respiratory system, central nervous system
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See also: INTRODUCTION
See ICSC CARD: 0578 See MEDICAL TESTS: 0070
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