Dipropylene Glycol n-Butyl Ether (DPnB)

Dipropylene glycol n-butyl ether (DPnB) is a high-boiling-point glycol ether (boiling point ~229°C) widely used as a co-solvent in water-based cleaners and disinfectants. It is a member of the propylene-glycol-ether family (P-series) — generally considered lower-toxicity than the ethylene-glycol-ether family (E-series) which includes 2-butoxyethanol. **Health classifications:** - H315 (skin irritation) at concentrate strength; below threshold at <2% in finished products - Not classified as a respiratory sensitizer or asthmagen - Not on Prop 65 list — propylene glycol ethers are NOT in the same Prop 65 category as ethylene glycol ethers - Acute oral toxicity: low (rat LD50 >5,000 mg/kg) **Environmental:** - Readily biodegradable per OECD 301 - Low aquatic toxicity (LC50 >100 mg/L for fish) - VOC: yes (low vapor pressure but classified VOC). At 1-2% in finished products, contributes <20 g/L absolute VOC. - Not bioaccumulative; not persistent; not PFAS In OdoBan and similar quat-based disinfectants, DPnB is the coupling-agent / co-solvent that helps the antimicrobial active wet hard surfaces and penetrate organic soils. Use concentration is typically 1-2% in RTU and 5-10% in concentrates.