NIOSH logo and tagline

2,3,7,8-Tetrachloro-dibenzo-p-dioxin

Related Pages
Synonyms & Trade Names
Dioxin, Dioxine, TCDBD, TCDD, 2,3,7,8-TCDD [Note: Formed during past production of 2,4,5-trichlorophenol, 2,4,5-T & 2(2,4,5-trichlorophenoxy)propionic acid.]
CAS No.
1746-01-6
RTECS No.
HP3500000
DOT ID & Guide
Formula
C₁₂H₄Cl₄O₂
Conversion
IDLH
Ca [N.D.]
See: IDLH INDEX
Exposure Limits
NIOSH REL
Ca See Appendix A
OSHA PEL
none
Measurement Methods
None available
See: NMAM or OSHA Methods
Physical Description
Colorless to white, crystalline solid. [Note: Exposure may occur through contact at previously contaminated worksites.]
Molecular Weight
322.0
Boiling Point
Decomposes
Melting Point
581°F
Solubility
0.00000002%
Vapor Pressure
(77°F): 0.000002 mmHg
Ionization Potential
?
Specific Gravity
?
Flash Point
?
Upper Explosive Limit
?
Lower Explosive Limit
?
Incompatibilities & Reactivities
UV light (decomposes)
Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
irritation eyes; allergic dermatitis, chloracne; porphyria; gastrointestinal disturbance; possible reproductive, teratogenic effects; In Animals: liver, kidney damage; hemorrhage; [potential occupational carcinogen]
Target Organs
Eyes, skin, liver, kidneys, reproductive system
Cancer Site
[in animals: tumors at many sites]
Personal Protection/Sanitation
(See protection codes)
Skin:Prevent skin contact
Eyes:Prevent eye contact
Wash skin:When contaminated/Daily
Remove:When wet or contaminated
Change:Daily
Provide:Eyewash, Quick drench
First Aid
(See procedures)
Eye:Irrigate immediately
Skin:Soap flush immediately
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 having an N100, R100, or P100 filter.
Click here for information on selection of N, R, or P filters.
Any appropriate escape-type, self-contained breathing apparatus

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 1467
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health