Propylene Glycol n-Propyl Ether (PNP), chemically identified as 1-propoxy-2-propanol (CAS No. 1569-01-3), is a fast-evaporating, high-performance P-series glycol ether. It serves as a versatile solvent characterized by its colorless liquid form and mild, ether-like odor. PNP is engineered to balance hydrophobic and hydrophilic properties, making it an exceptional coupling agent and solvent for both water-reducible and solvent-based systems. Unlike ethylene-based (E-series) glycol ethers, PNP offers a superior safety profile with lower systemic toxicity, making it a preferred choice in environmentally conscious formulations. Its chemical structure—comprising an ether linkage and a hydroxyl group—allows it to dissolve a wide range of resins, including acrylics, epoxies, alkyds, and polyesters. As a professional-grade industrial solvent, PNP is valued for its ability to reduce surface tension and improve flow and leveling in coating applications, while maintaining a moderate evaporation rate that ensures optimal film formation.
**Superior Solvency:** Exhibits high solvency power for various resins, oils, and greases, facilitating the formulation of concentrated cleaners and high-solids coatings.
**Excellent Coupling Ability:** Acts as an effective intermediate, enabling the blending of water-insoluble organic components into aqueous systems.
**Surface Tension Reduction:** Significantly lowers the surface tension of water-based formulations, enhancing substrate wetting and adhesion.
**Safety Profile:** Offers lower toxicity and fewer regulatory restrictions compared to ethylene glycol propyl ethers (EP).
**Controlled Evaporation:** Provides a moderate evaporation rate that prevents “flash dry” issues while ensuring timely curing and drying of films.
**Full Compatibility:** Miscible with most organic solvents and partially soluble in water.
**Chemical Formula:** $C_6H_{14}O_2$ (or $CH_3CH(OH)CH_2OCH_2CH_2CH_3$)
**Molecular Weight:** 118.17 g/mol
**Boiling Point:** 149.8°C (301.6°F) at 760 mmHg.
**Flash Point:** 48°C (118.4°F) – Classified as a flammable liquid; requires grounded storage and handling.
**Vapor Pressure:** 1.7 mmHg at 20°C, indicating moderate volatility.
**Specific Gravity:** 0.880–0.890 at 20°C.
**Water Solubility:** 15% by weight at 25°C, providing a unique balance for oil-in-water emulsions.
**Viscosity:** 2.3 cP at 25°C, ensuring low-viscosity contributions to finished products.
**Refractive Index:** 1.413 at 20°C.
• Electrical and electronics
• Connectors, switches, PCB housings, terminal blocks
• Automotive
• Under-hood components, interior assemblies, cable conduits
• Wire and cable
• Insulation layers, sheathing, jacketing materials
• Construction
• Plastic fittings, conduits, insulation panels
• Consumer appliances
• Enclosures, adapters, plugs, casings
• Industrial components
• Fiber-reinforced composites, flame-retardant masterbatches
• Compatible polymers
• PA6, PA66
• PBT, PET
• PE, PP
• Blends and copolymers requiring halogen-free flame retardancy
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