Skip directly to local search Skip directly to A to Z list Skip directly to navigation Skip directly to site content Skip directly to page options
CDC Home

Enter search terms separated by spaces.

Dioxane

Synonyms & Trade Names
Diethylene dioxide; Diethylene ether; Dioxan; p-Dioxane; 1,4-Dioxane
CAS No.
123-91-1
RTECS No.
JG8225000
DOT ID & Guide
1165 127
Formula
C4H8O2
Conversion
1 ppm = 3.60 mg/m3
IDLH
Ca [500 ppm]
See: 123911
Exposure Limits
NIOSH REL
: Ca C 1 ppm (3.6 mg/m3) [30-minute] See Appendix A
OSHA PEL
†: TWA 100 ppm (360 mg/m3) [skin]
Measurement Methods

NIOSH 1602;
OSHA 7
See: NMAM or OSHA Methods
Physical Description
Colorless liquid or solid (below 53°F) with a mild, ether-like odor.
MW:
88.1
BP:
214°F
FRZ:
53°F
Sol:
Miscible
VP:
29 mmHg
IP:
9.13 eV
Sp.Gr:
1.03
Fl.P:
55°F
UEL:
22%
LEL:
2.0%
Class IB Flammable Liquid: Fl.P. below 73°F and BP at or above 100°F.
Incompatibilities & Reactivities
Strong oxidizers, decaborane, triethynyl aluminum
Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
irritation eyes, skin, nose, throat; drowsiness, headache; nausea, vomiting; liver damage; kidney failure; [potential occupational carcinogen]
Target Organs
Eyes, skin, respiratory system, liver, kidneys
Cancer Site
[in animals: lung, liver & nasal cavity tumors]
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, Quick drench
First Aid
(See procedures)
Eye: Irrigate immediately
Skin: Water wash promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations

NIOSH

At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration:
(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: 0041   See MEDICAL TESTS: 0090
 

Order NIOSH Publications

Contact Us:
USA.gov: The U.S. Government's Official Web PortalDepartment of Health and Human Services
Centers for Disease Control and Prevention   1600 Clifton Rd. Atlanta, GA 30333, USA
800-CDC-INFO (800-232-4636) TTY: (888) 232-6348 - Contact CDC–INFO