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Phenyl bis(2,4,6-trimethylbenzoyl)-phosphine oxide is reported to be no self-ignite, non-flammable. non-explosive, and non-oxidising solid with poor soluble (< 0.1 mg/L at 20 ℃) .The test substanc has a melting range of 127 -131.4 ℃ and a boiling point of >168 ℃.The relative density is 1.19 at 20 ℃, and the mass median diameter of particle size is 22.29 μm. The vapour pressure is reported to be <0.0000002 Pa at 20 ℃ and <0.000002 Pa at 25 ℃. The log Pow is 5.77 at 22 ℃ and the surface tension is 71.1 mN/m at 20 ℃ in saturated solution. In conclusion, according to its physico-chemical data, the test material does not possess any hazardous properties.