Diphenyl oxide (DPO) is a colorless liquid, which emits floral odor at temperatures of 80ºF (27ºC) and above. It is a white, crystalline solid at temperatures below 80ºF (27ºC). DPO has low volatility, low solubility in water, and is stable at high temperatures. It belongs to the family of aromatic homomonocyclic compounds. DPO is also recognized by the names Oxydibenzene,
Diphenyl ether, Diphenyl oxide, 1,1'-Oxybisbenzene, and Phenoxybenzene.