© 2026 Nanjing Finechem Holdings Co., Ltd,
All Right Reserved
Name: Lithium Phenyl-2,4,6-trimethylbenzoylphosphinate
Chemical Formula: C18H18LiO2P
Common Uses: Photoinitiator for radical polymerization, mainly used in 3D printing resins and advanced coatings
Physical State: Typically found as a white or off-white crystalline powder
Solubility: Shows moderate solubility in water, greater in organic solvents such as DMSO and methanol
Odor: Nearly odorless
Classification: Often rated under skin sensitizer, eye irritant, and specific target organ toxicity with repeated exposure
Hazard Pictograms: Exclamation mark indicates risks to skin and eyes
Primary Risks: Exposure may trigger skin reactions, respiratory irritation, eye discomfort, and possible long-term effects on organs if inhaled or absorbed over prolonged periods
Route of Exposure: Inhalation, skin contact, eye contact, accidental ingestion
Acute Symptoms: Redness, stinging, nausea, coughing
Main Component: Lithium Phenyl-2,4,6-trimethylbenzoylphosphinate at a purity level above 95% in most supplies
Impurities: Trace solvents or ancillary chemicals used in synthesis may linger in minor concentrations
Additives: None typically added during storage or shipping, though some formulations in industry blend with photoactive agents
Inhalation: Move to fresh air as soon as possible; consider medical attention if coughing persists
Skin Contact: Wash area thoroughly with soap and water; take off contaminated clothing
Eye Contact: Immediately rinse with plenty of water, lifting upper and lower eyelids to flush; seek medical help for lasting irritation
Ingestion: Rinse mouth with water if conscious; medical assistance should be sought due to potential toxic effects
Suitable Extinguishing Media: Use water spray, dry chemical powder, or CO2 for small fires
Unusual Hazards: Combustion can produce hazardous gases including phosphorus oxides and aromatic compounds
Protective Equipment: Firefighters should use full protective gear and self-contained breathing apparatus in poorly ventilated areas
Special Advice: Limit spread of contaminated runoff and avoid breathing fumes generated by thermal decomposition
Personal Precautions: Wear gloves, goggles, and an appropriate dust mask or respirator
Environmental Precautions: Avoid release into drains or waterways, as phosphinate salts present lasting risk to aquatic organisms
Cleanup Methods: Collect spilled powder using damp absorbent material, place in sealed containers for disposal; wash spill area thoroughly to remove residue
Handling: Always keep containers tightly closed to prevent contamination and moisture ingress; handle in a well-ventilated area with local exhaust, since fine powders disperse easily
Storage: Store locked up in cool, dry, well-ventilated conditions, away from strong oxidizers and sources of ignition; light exposure may reduce material stability
Incompatibilities: Reacts with acids, strong bases, or oxidizing agents, which may destabilize the compound or trigger hazardous byproducts
Engineering Controls: Fume hoods and HEPA-filtered environments provide effective dust containment
Personal Protection: Nitrile gloves, chemical splash goggles, and particulate respirator recommended during direct handling or weighing
Workplace Hygiene: Regular handwashing and proper laundering of work clothing reduce incidental uptake; eating, drinking, and smoking should be kept away from handling zones
Exposure Limits: No specific regulatory occupational exposure limits have been universally established, so best practice involves minimizing direct exposure as much as possible
Appearance: White to off-white crystalline solid
Odor: Faint, typically non-offensive
Melting Point: Ranges between 180-200°C based on sample purity and storage history
Boiling Point: Does not boil under normal atmospheric pressure; decomposes instead
Flash Point: Not well established due to material decomposition before volatilization
Solubility in Water: Limited, but dissolves readily in polar organic solvents such as methanol and acetonitrile
Partition Coefficient: No public data, though behavior suggests moderate hydrophobicity
Vapor Pressure: Low, as the compound remains non-volatile at room temperature
Other Characteristics: Stable under ambient light but degrades with prolonged UV exposure
Stability: Stable at room temperature if kept dry and out of direct sunlight
Reactivity: Exhibits sensitivity to acids, strong bases, and oxidizing materials
Decomposition: Decomposes at high heat, producing irritant fumes, phosphorus oxides, lithium salts, and aromatic hydrocarbons
Polymerization: Not prone to hazardous polymerization without photoinitiated processes
Acute Effects: Can cause skin and eye irritation, drowsiness, headaches, or mild respiratory effects with direct exposure
Chronic Effects: Repeated contact may trigger cumulative irritation or dermatitis; literature on long-term carcinogenicity remains limited
Sensitization: Some users report allergy-like responses or exacerbated symptoms in sensitive individuals
Inhalation: Fine particulates can irritate nose, throat, and lungs upon inhalation, especially in poorly ventilated workspaces
Ingestion: Oral toxicity data for humans is lacking but should be avoided due to potential systemic toxicity
Mutagenicity: No strong evidence for genotoxicity; further research may help clarify risks for chronic low-dose exposure
Ecotoxicity: Shows toxic effects on aquatic invertebrates and fish, raising concerns about accidental environmental release
Persistence: Chemical structure resists rapid biodegradation, so compound can linger in soils or sediments
Bioaccumulation: Low potential due to water solubility and degradation under sunlight, but breakdown products may carry their own risks
Wastewater Care: Material avoidance in large-scale rinse streams helps protect local waterways, since current municipal treatment may not capture all residues
Method: Should go to chemical waste incineration following local environmental protocols; home disposal routes should always be avoided
Avoid: Do not discharge unused or contaminated material into natural bodies of water, sanitary sewers, or open landfills
Container Cleanup: Triple rinse and decontaminate empty containers before recycling or disposal, minimizing fugitive dust risk during handling
Restrictions: Not generally classified as dangerous for transportation by road, sea, or air in quantities typical of laboratory or industry use
Packing: Carriers expect robust internal packaging with secure closures and secondary containment to prevent spills
Labeling: Clear hazard information should remain visible on all transport packages
Incidents: Immediate response teams should be ready for cleanup if material escapes during shipment due to rough handling
Global Status: Some regions list the compound as a hazardous substance requiring user training, record-keeping, and reporting for bulk users
Workplace Controls: National and local safety agencies recommend protective measures tailored to photoinitiator chemicals
Environmental Law: Disposal and accidental release regulations enforce containment and waste management for this class of organolithium compounds
Ongoing Assessment: Regulatory bodies watch for new toxicology data on photoinitiators, adapting guidance to emerging scientific findings
