2,4,6-trimethylbenzoyl diphenylphosphine oxide
CAS Number
75980-60-8
EC Number
278-355-8
What is 2,4,6-trimethylbenzoyl diphenylphosphine oxide?
2,4,6-Trimethylbenzoyl diphenylphosphine oxide, commonly known as TPO, is a monoacylphosphine oxide photoinitiator that triggers free-radical polymerization upon UV or visible light exposure.
Where is 2,4,6-trimethylbenzoyl diphenylphosphine oxide used?
- UV-curable systems: rapid crosslinking and curing without thermal activation
- UV-curable coatings for wood, metal and plastic: fast surface cure and low yellowing in clear and pigmented finishes
- LED-UV and broad-spectrum UV inkjet and offset printing inks: strong absorption in the 380–420 nm range
- Adhesives and sealants: through-cure in acrylate-based systems
- Dental composites and optical fiber coatings: controlled, rapid photopolymerization
- It cures effectively under visible light.
Commercial specifications
- High purity, typically ≥98–99%
- Packaging from kilogram quantities to bulk drums
Other Names (Synonyms)
Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide|diphenylphosphoryl-(2,4,6-trimethylphenyl)methanone|(2,4,6-Trimethylbenzoyl)diphenylphosphine oxide
What are the physical properties of 2,4,6-trimethylbenzoyl diphenylphosphine oxide?
Melting Point 87-89 °C
Boiling Point 519.6±60.0 °C(Predicted)
Density 1.27 g/cm³
Flash Point >230 °F
Appearance white or cream powder
Color Light yellow to Yellow to Green
Form powder to crystal
Water Solubility 3.4mg/L at 20℃
Vapor Pressure 0Pa at 25℃
Refractive Index n 20/D 1.475(lit.)
Log P 3.1 at 23℃
How is 2,4,6-trimethylbenzoyl diphenylphosphine oxide classified and handled safely? Learn More
Danger
GHS07· Irritant GHS08· Health Hazard GHS09· Environmental Hazard
Hazard Statements
H317 May cause an allergic skin reaction [Warning Sensitization, Skin]
Which trade and regulatory codes apply to 2,4,6-trimethylbenzoyl diphenylphosphine oxide?
HS Code 29319090
UN Number 3077
ADR Class 9
Packing Group III
Storage Class 11 - Combustible Solids
WGK (Germany) 2