Di(propylene glycol) Ether (Dipropylene Glycol Ether)

CAS No.: 25265-71-8
Synonyms / IUPAC Name: Dipropylene glycol ether (mixture of isomers)
Molecular Formula: C₆H₁₄O₃
Molecular Weight: ~134.18 g/mol
Appearance: Colourless clear liquid, slightly viscous

Physicochemical Properties (Typical)

• Boiling Point: ≈ 229–232 °C (at 760 mmHg)
• Specific Gravity / Density: ~1.02 g/cm³ (20–25 °C)
• Vapour Pressure: ~0.03 mmHg (25 °C)
• Solubility in Water: Miscible
• Flash Point: ~118 °C (closed cup)
• Other: Low volatility, hygroscopic, compatible with many common solvents

Purity & Quality Standards

• Typical Purity: ≥ 99% (sum of isomers, by assay)
• Appearance Specification: Clear liquid, no visible particulates or haze
• Key Indicators: Assay, moisture content, refractive index, density, viscosity
• Storage Recommendation: Store sealed in a cool, dry, well-ventilated area; protect from heat, strong oxidisers and direct sunlight

Applications / Uses

• Solvent or co-solvent in coatings, inks, adhesives and resin formulations — improves film formation and compatibility in higher-boiling systems.
• Cleaning, degreasing and surface-treatment formulations where a moderate evaporation rate is advantageous.
• Carrier solvent and viscosity modifier in personal-care and fragrance applications.
• Intermediate or additive in polymer, textile, printing and specialty chemical processes.

Safety & Handling

• Flammability: Combustible liquid; vapours may form flammable mixtures under certain conditions.
• Health Hazards:
• Inhalation: High vapour concentrations may cause respiratory irritation or dizziness.
• Skin Contact: Prolonged or repeated exposure may cause mild irritation.
• Eye Contact: May cause irritation.
• Precautions:
• Use in well-ventilated areas or with local exhaust ventilation.
• Wear protective gloves, eye/face protection and appropriate protective clothing.
• Keep away from ignition sources; ground and bond containers during transfer to avoid static discharge.
• Reactivity / Incompatibilities: Avoid strong oxidising agents and strong bases; avoid high temperatures that may cause decomposition.

Packaging & Storage

• Packaging: Supplied in sealed, solvent-compatible containers (e.g., steel drums or lined barrels) suitable for industrial solvents.
• Storage Conditions: Store in a cool (< 30 °C), dry, well-ventilated area away from direct sunlight, moisture and ignition sources; keep containers tightly closed when not in use.
• Shelf Life: Stable under recommended storage conditions; inspect container integrity and product appearance if stored for extended periods.