Product Name: Diphenylisodecyl Phosphite
Chemical Family: Organophosphite Compound
Chemical Formula: C28H41O3P
Synonyms: Phosphorous acid, isodecyl diphenyl ester
CAS Number: 25550-98-5
Recommended Use: Antioxidant, stabilizer in polymers and plastics
Manufacturer: Confidential supplier or manufacturer identification available on request
Emergency Contact: Local chemical emergency number or poison control center
Classification: Skin irritation (Category 2), Eye irritation (Category 2A), Aquatic Chronic Hazard (Category 2)
GHS Label Elements: Hazard pictogram (exclamation mark, environment), signal word “Warning”
Hazard Statements: Causes skin and eye irritation, harmful to aquatic life with long-lasting effects
Precautionary Statements: Use protective gloves, protective clothing, eye and face protection; avoid release to environment
Potential Health Effects: Irritation to skin and eyes, possible respiratory tract effects if inhaled
Environmental Hazards: Risk of contamination to aquatic environments, possible persistence
Chemical Name: Diphenylisodecyl Phosphite
CAS Number: 25550-98-5
Concentration: ≥98% by weight
Impurities: May contain trace phenolic and alkyl phosphite byproducts below 2%
Other Ingredients: None impacting hazard classification
Inhalation: Move exposed person to fresh air, seek medical attention for symptoms such as irritation, cough, or breathing difficulty
Skin Contact: Remove contaminated clothing and shoes, wash exposed skin thoroughly with soap and water, seek medical attention for persistent irritation
Eye Contact: Immediately rinse eyes with plenty of water for several minutes, lift eyelids to ensure thorough flushing, seek medical attention promptly
Ingestion: Do not induce vomiting, rinse mouth, never give anything by mouth to an unconscious person, seek immediate medical attention
Important Symptoms: Skin redness, blistering, eye watering or redness, throat discomfort
Notes to Physician: Treat symptomatically based on patient’s reactions, monitor for chemical pneumonitis in severe inhalation exposure
Suitable Extinguishing Media: Dry chemical powder, alcohol-resistant foam, carbon dioxide, water spray
Unsuitable Extinguishing Media: Direct water jets can spread burning liquid
Hazardous Combustion Products: Phosphorus oxides, carbon oxides, hydrocarbon fragments, irritating fumes and smoke
Special Protective Equipment for Firefighters: Full protective clothing, self-contained breathing apparatus
Fire and Explosion Hazards: Containers exposed to heat can burst, thermal decomposition releases toxic fumes
Advice for Firefighters: Stay upwind, use containment methods to stop spread of contaminated water
Personal Precautions: Wear gloves, safety goggles, and suitable protective clothing, ventilate area
Environmental Precautions: Prevent from entering soil, drains, sewers, and waterways
Containment Methods: Absorb spill with non-combustible material (sand, earth, vermiculite), place in disposal container
Clean-up Procedures: Avoid raising dust, remove with tools that minimize dispersion, dispose in accordance with local regulations
Emergency Response: Evacuate area in case of large spill, restrict access, ventilate and monitor the area for gas or vapor
Safe Handling Practices: Use in well-ventilated areas, avoid skin and eye contact, keep away from heat or ignition sources, wash hands after use
Storage Conditions: Store in tightly sealed containers, keep in cool, dry indoor locations away from direct sunlight, moisture, and incompatible substances (strong oxidizers, acids)
Incompatibilities: Strong acids, strong oxidizers, peroxides, alkali metals
Specific Storage Recommendations: Prevent static electricity buildup, label all containers clearly, inspect periodically for leaks or corrosion
Bulk Handling: Provide spill containment trays or bunding, ensure emergency showers and eyewash stations are accessible
Exposure Limits: No established Occupational Exposure Limits for this substance listed by OSHA, ACGIH, or NIOSH
Engineering Controls: Local exhaust ventilation, process enclosures, eye wash stations, safety showers
Personal Protective Equipment: Splash goggles, chemical-resistant gloves (nitrile, neoprene), long-sleeved clothing
Respiratory Protection: NIOSH-approved respirator for high airborne concentrations or inadequate ventilation
Hygiene Measures: Do not eat, drink, or smoke while handling, remove clothing immediately if contaminated, wash thoroughly before breaks and after work
Appearance: Clear, pale to yellow liquid, sometimes slightly viscous
Odor: Mild aromatic odor
Odor Threshold: Not available
pH: Not applicable (non-aqueous)
Melting/Freezing Point: Below -30°C
Boiling Point: 320–340°C
Flash Point: 180°C (closed cup)
Evaporation Rate: Not determined
Flammability: Not highly flammable, can burn at high temperature
Explosion Limits: Not determined
Vapor Pressure: Low, less than 0.1 mmHg at 25°C
Vapor Density: Heavier than air
Relative Density: 0.98–1.03 g/cm³ at 20°C
Solubility: Insoluble in water, miscible with organic solvents
Partition Coefficient (n-octanol/water): log Pow > 6 (expected, non-polar)
Auto-Ignition Temperature: Above 300°C
Decomposition Temperature: Above 220°C, with possible release of hazardous gases
Viscosity: 70–120 mPa·s at 20°C
Stability: Stable under normal temperature and pressure
Decomposition: Forms toxic gases (phosphorus oxides, carbon oxides) under fire/high temperatures
Polymerization: Not known to polymerize
Reactivity: Reactive with strong acids, oxidizers, halogen compounds, some metals
Conditions to Avoid: Excessive heat, flame, direct sunlight, moisture
Incompatible Materials: Acidic materials, oxidizing agents, alkali metals
Acute Toxicity: Not acutely toxic by oral, dermal, or inhalation routes (LD50 oral rat estimated >2,000 mg/kg)
Skin Corrosion/Irritation: Causes skin irritation in direct/repeated contact
Eye Damage/Irritation: Causes moderate to severe eye irritation on contact
Respiratory Sensitization: Inhalation of mist may cause respiratory discomfort
Chronic Effects: Prolonged or repeated contact may worsen dermatitis or eczema
Carcinogenicity: No evidence of carcinogenic effects in long-term studies
Reproductive Toxicity: Data not sufficient for classification
Mutagenicity: No data indicating mutagenic potential
Other Health Effects: Ingestion can cause gastrointestinal disturbance, central nervous system depression in severe cases
Ecotoxicity: Harmful to aquatic organisms, may cause long-term adverse effects in aquatic environments
Persistence and Degradability: May persist in the environment, slow biodegradation observed
Bioaccumulative Potential: High log Pow suggests potential for bioaccumulation in aquatic species
Mobility in Soil: Limited mobility, binds strongly to organic matter
Other Adverse Effects: Disruptions to algae, invertebrate, and fish growth possible at high concentrations
Disposal Methods: Incinerate in licensed facility or handle as hazardous industrial waste
Waste Code: Dependent on jurisdiction, may require hazardous waste classification
Contaminated Packaging: Empty containers retain residues, send for recycling or disposal via registered waste contractor
Special Precautions: Do not allow to enter surface water, soil, or sewage systems during disposal, comply with local/national regulations
UN Number: Not classified as dangerous under current transport regulations
Proper Shipping Name: Chemical, not otherwise specified
Hazard Class: Not regulated for ground, sea, or air shipment in most regions
Packing Group: Not assigned
Labeling Requirements: None specified for international transport, may require “Environmentally Hazardous Substance” label locally
Special Precautions: Prevent container damage and leakage, transport upright, segregate from reactive chemicals
TSCA Status: Listed on the U.S. Toxic Substances Control Act (TSCA) Inventory
REACH Status: Subject to registration under EU REACH where applicable
SARA Title III: Not categorized as a reportable hazardous substance
California Proposition 65: Not listed as a chemical known to cause cancer, birth defects, or reproductive harm
Other National Inventories: Present on Australia AICS, Canada DSL, China IECSC, Japan ENCS, Korea KECI
Workplace Regulations: Use aligned with OSHA, EU CLP, and local right-to-know laws
Product Classification: Subject to workplace safety, hazardous chemical, and workplace environmental prevention provisions
