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

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.]
MW:
322.0
BP:
Decomposes		 MLT: 581°F
Sol:
0.00000002%		 VP(77°F): 0.000002 mmHg
IP:
?
Sp.Gr:
?
Fl.P:
?
UEL:
?
LEL:
?
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   See ICSC CARD: 1467
 

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