OMNIRAD TPO

CAS Number: 75980-60-8
 EC Number: 278-355-8
 Molecular Formula: C₂₂H₂₁O₂P
 Molecular Weight: 348.38 g/mol

 Synonyms:
TPO,2,4,6-Trimethylbenzoyldiphenylphosphine oxide,Lucirin TPO (BASF trademark),Esacure TPO (IGM Resins trademark),Phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide (incorrect but sometimes used)

Physical and Chemical Properties:
 Omnirad TPO appears as a pale yellow crystalline powder with a faint characteristic odor. 
It exhibits a melting point of 88-92°C and demonstrates excellent thermal stability up to 200°C. 
The compound shows moderate solubility in common monomers: 15-20% in acrylates, 5-10% in styrene, and limited solubility in water (<0.1 g/L). 

Its unique molecular architecture features both phosphine oxide and benzoyl chromophores, enabling broad absorption in the UV-A range (λmax = 380 nm, ε = 2500 M⁻¹cm⁻¹) with significant tailing into visible light up to 420 nm.
 
Quality Control Parameters:
Purity: >99.0% by HPLC
Melting Range: 88-92°C
Heavy Metals: <10 ppm
Residual Solvents: <500 ppm (toluene, hexane)
Color: APHA <100 (5% in MMA)
Volatile Content: <0.5%
Global production capacity is estimated at 2,000-3,000 metric tons annually, dominated by IGM Resins (Netherlands), BASF (Germany), and Tianjin Jiuri New Materials (China). Pricing reflects high purity requirements, ranging from $40-60/kg for standard grades to $80-120/kg for high-purity electronic grades.
Unique Advantages:
Broad Absorption Spectrum: Effective from 250-420 nm, enabling curing through pigments and fillers
Oxygen Insensitivity: Phosphinoyl radicals react efficiently with molecular oxygen, reducing oxygen inhibition
High Reactivity: Enables rapid curing at low concentrations (0.5-2.0%)
Low Yellowing: Minimal formation of colored byproducts
Thermal Stability: No significant decomposition below 200°C
Quantum Yield and Efficiency:
Quantum Yield (Φ): 0.8-0.9 (high efficiency)
Molar Extinction Coefficient: ε₃₈₀ = 2500 M⁻¹cm⁻¹
Radical Yield: 1.8-1.9 radicals per photon absorbed
Oxygen Quenching Rate: kq = 2 × 10⁹ M⁻¹s⁻¹
Comprehensive Application Spectrum
Industrial Coatings (40% of consumption):
Wood Coatings: For furniture and flooring, typically at 1-3% concentration. Enables high-gloss finishes with excellent scratch resistance.
Plastic Coatings: On automotive parts, electronics housings, and consumer goods (0.5-2.0%).
Metal Coatings: For coil coating and industrial maintenance (1-4%).
Case Example: In automotive interior plastic coatings, TPO (1.5-2.0%) enables curing through dark pigments at line speeds of 20-30 m/min with excellent adhesion to polypropylene substrates.
Graphic Arts and Inks (30%):
Offset Inks: For packaging and publication (2-4%).
Screen Inks: Particularly for glass and ceramics (1-3%).
Flexographic Inks: For flexible packaging (1.5-2.5%).
Overprint Varnishes: Provides scratch and chemical resistance.
Case Example: In food packaging flexo inks, TPO (1.8-2.2%) enables curing through titanium dioxide pigments while meeting migration requirements for food contact.
Electronic Applications (15%):
Conformal Coatings: For circuit board protection (0.5-1.5%).
Optical Fiber Coatings: Primary and secondary coatings (1-2%).
Adhesives: For display assembly and component bonding (1-3%).
Encapsulants: For LED packaging (0.8-1.5%).
Case Example: In LED encapsulation, TPO (0.8-1.2%) provides rapid curing of silicone-acrylate hybrids with minimal heat generation, protecting sensitive semiconductor junctions.
3D Printing and Additive Manufacturing (10%):
Stereolithography (SLA): As primary initiator in resin formulations (0.5-1.5%).
Digital Light Processing (DLP): Enables rapid layer curing (0.3-1.0%).
Case Example: In dental crown printing, TPO-based resins (0.8-1.2%) provide accuracy to 25 µm with biocompatibility and mechanical properties matching natural dentin.
Other Applications (5%):
Dental Composites: For fillings and restorative materials.
Optical Lenses: For eyeglass and instrument lens coatings.
Medical Devices: Coatings for catheters and implants.
Automotive Headlamps: Coatings for polycarbonate lenses.

SAFETY INFORMATION ABOUT OMNIRAD TPO

 
 
 
 
 
 
First aid measures:
Description of first aid measures:
General advice:
Consult a physician. 
Show this safety data sheet to the doctor in attendance.
Move out of dangerous area:
 
If inhaled:
If breathed in, move person into fresh air. 
If not breathing, give artificial respiration.
Consult a physician.
In case of skin contact:
Take off contaminated clothing and shoes immediately. 
Wash off with soap and plenty of water.
Consult a physician.
 
In case of eye contact:
Rinse thoroughly with plenty of water for at least 15 minutes and consult a physician.
Continue rinsing eyes during transport to hospital.
 
If swallowed:
Do NOT induce vomiting. 
Never give anything by mouth to an unconscious person. 
Rinse mouth with water. 
Consult a physician.
 
Firefighting measures:
Extinguishing media:
Suitable extinguishing media:
Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Special hazards arising from the substance or mixture
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas
 
Advice for firefighters:
Wear self-contained breathing apparatus for firefighting if necessary.
Accidental release measures:
Personal precautions, protective equipment and emergency procedures
Use personal protective equipment. 
 
Avoid breathing vapours, mist or gas. 
Evacuate personnel to safe areas.
 
Environmental precautions:
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
 
Methods and materials for containment and cleaning up:
Soak up with inert absorbent material and dispose of as hazardous waste. 
Keep in suitable, closed containers for disposal.
 
Handling and storage:
Precautions for safe handling:
Avoid inhalation of vapour or mist.
 
Conditions for safe storage, including any incompatibilities:
Keep container tightly closed in a dry and well-ventilated place. 
Containers which are opened must be carefully resealed and kept upright to prevent leakage.
Storage class (TRGS 510): 8A: Combustible, corrosive hazardous materials
 
Exposure controls/personal protection:
Control parameters:
Components with workplace control parameters
Contains no substances with occupational exposure limit values.
Exposure controls:
Appropriate engineering controls:
Handle in accordance with good industrial hygiene and safety practice.
Wash hands before breaks and at the end of workday.
 
Personal protective equipment:
Eye/face protection:
Tightly fitting safety goggles. 
Faceshield (8-inch minimum). 
Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).
 
Skin protection:
Handle with gloves. 
Gloves must be inspected prior to use. 
Use proper glove
removal technique (without touching glove's outer surface) to avoid skin contact with this product. 
Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices. 
Wash and dry hands.
 
Full contact:
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
Splash contact
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
It should not be construed as offering an approval for any specific use scenario.
 
Body Protection:
Complete suit protecting against chemicals, The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace.
Respiratory protection:
Where risk assessment shows air-purifying respirators are appropriate use a fullface respirator with multi-purpose combination (US) or type ABEK (EN 14387) respirator cartridges as a backup to engineering controls. 
 
If the respirator is the sole means of protection, use a full-face supplied air respirator. 
Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU).
Control of environmental exposure
Prevent further leakage or spillage if safe to do so. 
Do not let product enter drains.
Discharge into the environment must be avoided.
 
Stability and reactivity:
Chemical stability:
Stable under recommended storage conditions.
Incompatible materials:
Strong oxidizing agents:
Hazardous decomposition products:
Hazardous decomposition products formed under fire conditions. 
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas.
 
Disposal considerations:
Waste treatment methods:
Product:
Offer surplus and non-recyclable solutions to a licensed disposal company. 
Contact a licensed professional waste disposal service to dispose of this material.
Contaminated packaging:
Dispose of as unused product