Mono Propylene Glycol Mono Butyl Ether
Mono propylene glycol mono butyl ether (PNB) is a colorless liquid with an ether-like odor. It evaporates quickly and is hydrophobic (doesn’t mix well with water). PNB is a propylene oxide-based, or Pseries, glycol ether and a blend of two isomers: 1-butoxy-2-propanol (>95.0%, CAS# 5131-66-8), and 1-propanol-2-butoxy (<5.0%, CAS# 15821-83-7).
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