Propylene glycol n-butyl ether

Propylene glycol n-butyl ether (CAS 5131-66-8), commonly abbreviated as PnB and also marketed as 1-Butoxy-2-propanol, is a slow-evaporating glycol ether solvent used across coatings and industrial formulations. Its controlled evaporation rate and compatibility with both water-based and solvent-based systems make it a preferred choice for formulators managing film formation and flow in various chemical applications.

In architectural and industrial coatings, PnB functions as a coalescing aid and flow promoter, improving film leveling in waterborne latex systems. It is essential for achieving high-quality surface finishes. Automotive refinish and OEM coating formulators use it to extend open time and reduce surface defects in spray-applied finishes. This ensures a smooth application process and durable final product results.

In printing inks for packaging applications, it supports pigment dispersion and press stability across flexographic and gravure processes. This versatility makes it a staple in the modern printing industry. Hard-surface cleaners and industrial degreasers incorporate PnB to solubilize oils and greases while remaining compatible with water-dilutable concentrate formats for efficient cleaning performance.

Propylene glycol n-butyl ether is supplied as a clear liquid in standard packaging including drums and IBC totes. Bulk liquid is also available for high-volume procurement and large-scale manufacturing. Technical grade is the primary commercial specification, meeting purity requirements for coatings. Solvent-grade material is commonly evaluated against established benchmarks for purity and water content.