Material Safety Data Sheet: Benzil Dimethyl Ketal

Identification

Product Name: Benzil Dimethyl Ketal
Synonyms: 2,2-Dimethoxy-2-phenylacetophenone, Photoinitiator BDK
CAS Number: 24650-42-8
Recommended Use: UV initiator for inks, coatings, adhesives
Manufacturer: [Company Information]
Contact for Emergency: [Phone Number], [Website]
Address: [Location of Supplier]
Email: [Safety Contact Email]

Hazard Identification

GHS Classification: Eye Irritant Category 2A, Skin Sensitization Category 1, Acute Toxicity (Oral) Category 4
Signal Word: Warning
Hazard Statements: Causes serious eye irritation. May cause an allergic skin reaction. Harmful if swallowed.
Pictograms: Exclamation mark, Health hazard
Precautionary Statements: Avoid breathing dust, mist, vapors. Wear protective gloves and eye/face protection. Wash exposed skin after handling.
Other Hazards: May cause respiratory irritation and mild central nervous system effects at high concentrations.

Composition / Information on Ingredients

Chemical Name: Benzil Dimethyl Ketal
CAS Registry Number: 24650-42-8
Purity: ≥ 98%
Other Components: Trace levels of impurities, not contributing to hazard classification
Molecular Formula: C17H16O3
Molecular Weight: 268.31 g/mol

First Aid Measures

Inhalation: Move person to fresh air. Seek medical attention if symptoms persist or worsen.
Skin Contact: Remove contaminated clothing. Wash with soap and plenty of water. Seek medical attention for irritation or skin reaction.
Eye Contact: Rinse eyes with water for several minutes, holding eyelids open. Remove contact lenses if present. Continue rinsing and seek medical attention.
Ingestion: Rinse mouth. Do not induce vomiting. Get medical aid if ill effects develop.
Most Important Symptoms: Eye redness, tearing, allergic dermatitis, nausea on swallowing.

Fire-Fighting Measures

Suitable Extinguishing Media: Dry chemical, CO₂, foam, water spray (not straight stream).
Unsuitable Extinguishing Media: None known; water streams may spread material.
Hazardous Combustion Products: Carbon monoxide, carbon dioxide, phenolic and aromatic fumes.
Special Protective Equipment: Firefighters need self-contained breathing apparatus and protective clothing.
Advice for Firefighters: Cool exposed containers with water spray. Remove containers from fire area if safe.

Accidental Release Measures

Personal Precautions: Evacuate unprotected personnel. Ventilate area. Avoid breathing dust or vapor. Wear gloves and goggles.
Environmental Precautions: Prevent entry into drains, sewers, surface or ground water.
Spill Clean-Up Methods: Collect solid spill with non-sparking tools. Place in suitable disposal container. Wash area with soap and water. Ventilate thoroughly.
Disposal: Dispose of as hazardous waste according to local, state, and federal regulations.

Handling and Storage

Safe Handling: Only use in well-ventilated areas with local exhaust. Do not eat, drink or smoke while working. Avoid skin and eye contact. Ground and bond containers.
Storage Conditions: Store in tightly closed original container. Keep in dry, cool, well-ventilated place, away from light and ignition sources. Store below 25°C.
Incompatible Materials: Strong oxidizers, acids, bases.
Technical Measures: Storage location must have spill containment and eyewash stations.

Exposure Controls and Personal Protection

Exposure Limits: No official OSHA or ACGIH TLV available for this compound at time of writing.
Engineering Controls: Local exhaust ventilation, closed systems.
Respiratory Protection: Use NIOSH-approved respirators for dust or vapor if ventilation insufficient.
Eye Protection: Safety glasses with side shields, face shield for risk of splashing.
Skin Protection: Wear nitrile or neoprene gloves, long sleeves, lab coat.
Hygiene Measures: Wash hands thoroughly after handling. Remove contaminated clothing.

Physical and Chemical Properties

Appearance: Off-white to pale yellow crystalline powder
Odor: Mild characteristic aromatic
Odor Threshold: Not available
pH: Not applicable (insoluble in water)
Melting Point: 64–67°C
Boiling Point: Decomposes before boiling
Flash Point: >110°C (closed cup)
Evaporation Rate: Not determined
Flammability: Not classified as flammable solid
Explosion Limits: Not determined
Vapor Pressure: <0.01 mmHg at 20°C
Vapor Density: Not established
Relative Density: 1.18 g/cm³
Solubility: Insoluble in water, soluble in organic solvents like acetone, methanol
Partition Coefficient (log Kow): 2.3 (estimated)
Decomposition Temperature: >120°C
Viscosity: Not applicable (solid at 25°C)

Stability and Reactivity

Stability: Stable under normal temperatures and recommended storage conditions. Sensitive to light.
Hazardous Reactions: None under normal handling.
Conditions to Avoid: Strong light, excess heat, open flame, static discharge.
Incompatible Materials: Strong oxidizing agents, strong acids, alkalis.
Hazardous Decomposition Products: Carbon monoxide, carbon dioxide, aromatic compounds.

Toxicological Information

Likely Routes of Exposure: Inhalation, skin and eye contact, accidental ingestion
Acute Toxicity: LD50 (oral, rat): 2500–5000 mg/kg (est.); low vapor toxicity
Skin Irritation: Mild irritation possible on prolonged exposure. Sensitization in sensitive individuals.
Eye Irritation: Causes moderate to severe irritation
Chronic Effects: Allergic skin reactions after repeated exposure
Carcinogenicity: Not listed as a carcinogen by IARC, NTP or OSHA
Mutagenicity: No significant data in standard assays
Other Effects: May cause mild respiratory symptoms; high dose ingestion may lead to gastrointestinal discomfort

Ecological Information

Aquatic Toxicity: Harmful to aquatic life with long lasting effects. LC50 (fish, 96h): >100 mg/L
Persistence and Degradability: Not readily biodegradable
Bioaccumulation Potential: Moderate; log Kow suggests potential for uptake
Mobility in Soil: Low water solubility, likely to adsorb to soil and sediment
Other Adverse Effects: Avoid direct release to the environment

Disposal Considerations

Waste Treatment Methods: Dispose of as hazardous waste using licensed contractor.
Product Disposal: Incineration recommended according to local regulations
Container Disposal: Triple rinse, puncture, dispose by controlled landfill or approved facility
European Waste Code: 07 02 08 (waste from the manufacture of organic chemicals)

Transport Information

UN Number: Not regulated as a dangerous good for transport
Proper Shipping Name: Benzil Dimethyl Ketal or Photoinitiator BDK
Transport Hazard Class: Not classified
Packing Group: Not regulated
Environmental Hazards: Not a marine pollutant
Special Precautions: Avoid breakage, prevent release during transport

Regulatory Information

TSCA (USA): Listed on inventory
REACH (EU): Registered substance
OSHA (USA): Hazardous chemical under Hazard Communication Standard
WHMIS (Canada): D2B – Toxic material causing other effects
Other Regulations: Follow state, national, and international laws regarding handling and disposal. Not subject to specific reporting – general duty of care.