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Name	1,2,3,7,8-Pentachlorodibenzo-p-dioxin	EINECS	N/A
CAS No.	40321-76-4	Density	1.714g/cm³
PSA	18.46000	LogP	6.85160
Solubility	N/A	Melting Point	206°C (estimate)
Formula	C12H3 Cl5 O2	Boiling Point	448.5°Cat760mmHg
Molecular Weight	356.42	Flash Point	174°C
Transport Information	N/A	Appearance	N/A
Safety	Poison by ingestion. Questionable carcinogen. When heated to decomposition it emits toxic fumes of Cl⁻. See also CHLORINATED HYDROCARBONS, AROMATIC.	Risk Codes	N/A
Molecular Structure		Hazard Symbols	N/A
Synonyms	1,2,3,7,8-PeCDD;1,2,3,7,8-Pentachlorodibenzo-p-dioxin;1,2,3,7,8-Pentachlorodibenzo[b,e][1,4]dioxin; 1,2,3,7,8-Pentachlorodibenzodioxin;1,2,3,7,8-PnCDD; 2,3,4,7,8-Pentachlorodibenzo-p-dioxin;2,3,4,7,8-Pentachlorodibenzodioxin; D 54; PCDD 54	Article Data	10

1,2,3,7,8-Pentachlorodibenzo-p-dioxin Chemical Properties

IUPAC Name: 1,2,3,7,8-Pentachlorooxanthrene
Synonyms: 1,2,3,7,8-Pentachlorodibenzo-p-dioxin ; 1,2,3,7,8-Pentachlorooxanthrene ; Dibenzo[b,e][1,4]dioxin, 1,2,3,7,8-pentachloro- ; 1,2,3,7,8-Penta polychlorinated dibenzo-p-dioxin
CAS NO:40321-76-4
Molecular Formula of 1,2,3,7,8-Pentachlorodibenzo-p-dioxin (CAS NO.40321-76-4) :C₁₂H₃Cl₅O₂
Molecular Weight of 1,2,3,7,8-Pentachlorodibenzo-p-dioxin (CAS NO.40321-76-4) : 356.41602
Molecular structure of 1,2,3,7,8-Pentachlorodibenzo-p-dioxin (CAS NO.40321-76-4) :
Index of Refraction: 1.661
Surface Tension: 58.6 dyne/cm
Density: 1.714 g/cm³
Flash Point: 174 °C
Enthalpy of Vaporization: 67.99 kJ/mol
Boiling Point: 448.5 °C at 760 mmHg
Vapour Pressure: 8.14E-08 mmHg at 25°C

1,2,3,7,8-Pentachlorodibenzo-p-dioxin Toxicity Data With Reference

Organism	Test Type	Route	Reported Dose (Normalized Dose)	Source
guinea pig	LD50	oral	3100ng/kg (0.0031mg/kg)	Toxicology and Applied Pharmacology. Vol. 44, Pg. 335, 1978.
mouse	LD50	oral	337500ng/kg (0.3375mg/kg)	Toxicology and Applied Pharmacology. Vol. 44, Pg. 335, 1978.
rat	LD50	oral	206ug/kg (0.206mg/kg)	Archives of Toxicology. Vol. 66, Pg. 471, 1992.

1,2,3,7,8-Pentachlorodibenzo-p-dioxin Consensus Reports

IARC Cancer Review: Group 3 IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 7 ,1987,p. 56.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Animal Inadequate Evidence IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 15 ,1977,p. 41.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Human No Adequate Data IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 15 ,1977,p. 41.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210)

1,2,3,7,8-Pentachlorodibenzo-p-dioxin Safety Profile

Poison by ingestion. Questionable carcinogen. When heated to decomposition it emits toxic fumes of Cl⁻. See also CHLORINATED HYDROCARBONS, AROMATIC.
RIDADR 2811
HazardClass 6.1(a)
PackingGroup I

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