Solvents
REACH
Propylene glycol n-butyl ether
CAS Number
5131-66-8
EC Number
225-878-4
Abbreviation
PnB
What is Propylene glycol n-butyl ether?
Propylene glycol n-butyl ether (CAS 5131-66-8), commonly abbreviated as PnB, is a slow-evaporating glycol ether solvent. Also marketed as 1-Butoxy-2-propanol.
Where is Propylene glycol n-butyl ether used?
- Architectural and industrial coatings: coalescing aid and flow promoter, improving film leveling in waterborne latex systems
- Automotive refinish and OEM coatings: extends open time and reduces surface defects in spray-applied finishes
- Printing inks for packaging: supports pigment dispersion and press stability in flexographic and gravure processes
- Hard-surface cleaners and industrial degreasers solubilize oils and greases while remaining compatible with water-dilutable concentrate formats.
Commercial specifications
- Technical grade is the primary commercial specification, meeting purity requirements for coatings.
- Solvent-grade material is evaluated against benchmarks for purity and water content.
- Clear liquid in drums and IBC totes; bulk liquid for high-volume procurement.
Other Names (Synonyms)
n-Butoxy-2-propanol|RefChem:75241|1-Butoxy-2-propanol|1-Butoxypropan-2-ol|2-PROPANOL, 1-BUTOXY-|n-Butoxypropanol|2-Hydroxy-3-butoxypropane|Propasol solvent B|PnB
What are the physical properties of Propylene glycol n-butyl ether?
Melting Point -15.45°C (estimate)
Boiling Point 171 °C @ Press: 751 Torr
Density 0.88 g/cm³ (liquid) @ Temp: 25 °C
Flash Point 62°C
Color Colorless to Almost colorless
Odor Ether-like odor
Form clear liquid
Water Solubility 55g/L at 20℃
Vapor Pressure 1.39hPa at 19.85℃
Refractive Index n20/D 1.416(lit.)
Log P 1.2 at 20℃
How is Propylene glycol n-butyl ether classified and handled safely? Learn More
Warning
GHS07· Irritant
Hazard Statements
H315 Causes skin irritation
H319 Causes serious eye irritation
Precautionary Statements
P264 Wash … thoroughly after handling.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P321 Specific treatment (see … on this label).
P264+P265 Wash … thoroughly after handling.
Which trade and regulatory codes apply to Propylene glycol n-butyl ether?
HS Code 2909.49.6000
WGK (Germany) 1