Ethylene Glycol Monobutyl Ether (Butyl Cellosolve®)

   CAS No.: 111-76-2
   Synonyms / IUPAC Name: Ethylene Glycol Monobutyl Ether; 2-Butoxyethanol; Butyl Cellosolve®
   Molecular Formula: C₆H₁₄O₂
   Molecular Weight: 118.17 g/mol

Physicochemical Properties (Typical)

• Appearance: Colorless, clear mobile liquid
• Odor: Mild ether-like odor
• Melting/Freezing Point: ≈ –77 °C
• Boiling Point: ≈ 170.5 °C (at 760 mmHg)
• Density (25 °C): ≈ 0.901 g/cm³
• Vapor Pressure (20 °C): ≈ 0.8 mmHg
• Flash Point (closed cup): ≈ 65 °C
• Explosive / Flammable Limits (v/v in air): ≈ 1.1% (lower) – 12.7% (upper)
• Solubility: Miscible with water and common organic solvents
• Viscosity (~25 °C): ≈ 3.0 cP
• Surface Tension (25 °C): ≈ 27.1 dynes/cm

Purity & Quality Standards

• Purity (by GC or equivalent): ≥ 99.0% for high-grade solvent applications
• Moisture / Water Content: Controlled to low levels depending on grade
• Non-volatile Residues: Minimal and tightly controlled
• Analytical Methods: Gas chromatography, spectroscopy, titration as required
• Documentation: Certificate of Analysis (COA) and Safety Data Sheet (SDS) provided

Applications / Uses

• Solvent for coatings, inks, varnishes, and lacquers
• Cleaning agent in household and industrial formulations (hard surface cleaners, degreasers)
• Coupling agent and coalescent in water-borne paints and printing inks
• Intermediate for agrochemical formulations and chemical processing

Safety & Handling

• Hazard Classification: Combustible liquid; vapour may form explosive mixtures with air
• Health Hazards:
• Inhalation may irritate respiratory tract and may cause systemic effects
• Skin contact may cause irritation; absorption through skin possible
• Eye contact causes serious irritation
• Exposure Limits (typical):
• OSHA PEL (8-h TWA): 50 ppm
• NIOSH REL (10-h TWA): 5 ppm (skin notation)
• IDLH: 700 ppm
• Precautions:
• Use only in well-ventilated areas
• Avoid ignition sources, sparks, hot surfaces, and static discharge
• Ground and bond containers during transfer of large quantities
• Wear protective gloves, eye/face protection, and protective clothing
• Incompatibilities: Strong oxidizing agents, strong alkalis, heat, ignition sources
• First Aid:
• Inhalation: Move to fresh air; seek medical attention if symptoms persist
• Skin: Remove contaminated clothing; wash with soap and water
• Eyes: Rinse cautiously with water for several minutes; remove contact lenses if present
• Ingestion: Do not induce vomiting; seek immediate medical attention

Packaging & Storage

• Packaging: Sealed solvent-compatible containers (e.g., metal drums or HDPE barrels recommended)
• Storage Conditions: Cool (<30 °C), dry, well-ventilated area away from heat, flame and direct sunlight
• Container Closure: Keep containers tightly closed when not in use; ensure proper venting for drums
• Shelf Life: Typically 12–24 months under recommended storage conditions