Octachlorodibenzodioxin (can be abbreviated as OCDD) is one of polychlorinated dibenzodioxins (PCDDs). Its toxicity is similar to TCDD, but it is about 3000 times weaker. It is one of the dominant dioxin congeners in smoke emissions, but because it is much less soluble than e.g. TCDD, it is not bioaccumulated as effectively and it is toxicologically less important than the most prevalent dioxins (for details see Dioxins and dioxin-like compounds).

CAS：3268-87-9
中文别名：1,2,3,4,6,7,8,9-八氯联苯-P-二噁英;1,2,3,4,6,7,8,9-八氯二苯并对二噁英;八氯二苯并-对-二恶英;
英文别名：OCDD;octa-chlorodibenzo-p-dioxin;Octachlorodibenzo-4-dioxin;1,2,3,4,6,7,8,9-octachlorodibenzodioxin;1,2,3,4,5,6,7,8-octachlorodibenzodioxin;Octachlorodibenzo-p-dioxin;Octachlorodibenzodioxin;1,2,3,4,5,6,7,8-octachlorodibenzo-p-dioxin;Dibenzo-p-dioxin,octachloro;1,2,3,4,6,7,8,9-OCDD;octachlorinated dibenzodioxin;octachlorooxanthrene;
分子式：C12Cl8O2
分子量：459.751
精确质量：455.741
Psa：18.46
Logp：8.8118

UNII：YW59P10266

密度：1.886g/cm3
沸点：527.8ºC at 760mmHg
闪点：195.7ºC
折射率：1.674

危险品运输编码：UN 2811
海关编码：2932999099
危险类别：6.1(a)