n-Propyl Acetate (Medium-Evap Solvent for Gravure Ink)
CAS Number: 109-60-4
Technical-grade n-propyl acetate (n-PrOAc) serves as a medium-evaporation-rate solvent in gravure and high-speed flexographic printing inks, balancing fast press evaporation with sufficient open time to prevent dot gain and plate drying, especially at elevated press speeds. Its high solvency for nitrocellulose, polyurethane, and polyamide resins and low aromatic odor make n-PrOAc the preferred solvent upgrade from ethyl acetate in premium packaging ink formulations.
Technical Specifications
| appearance | Clear colorless liquid |
| purity (%) | ≥99.0 |
| water content (%) | ≤0.05 |
| boiling point (°C) | 101–102 |
| density (g/mL, 20 °C) | 0.885–0.890 |
Applications
- Medium-evap solvent in rotogravure packaging inks
- Co-solvent in high-speed flexo ink formulations
- Slow-evap diluent for extended press runs
- Solvent in specialty NC and PU-based lamination inks
- Cleaning and wash-up solvent for gravure presses
Key Features
- Medium evaporation rate prevents plate drying on high-speed gravure presses
- Excellent solvency for NC, PU, and PA resins comparable to ethyl acetate
- Lower odor than ethyl acetate for improved press-room working conditions
- Good compatibility with ethyl acetate and IPA solvent blends
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