PHO (propane hash oil) is BHO's cousin, using liquid propane instead of butane as the extraction solvent. Propane has a lower boiling point (-42°C vs butane's -1°C) which means colder extraction temperatures and selective pulling — propane tends to extract terpenes more efficiently and waxes/lipids less efficiently than butane. The result is typically a higher-terp, lower-fat extract that purges to a specific texture profile (budder and live-resin formats are particularly common). PHO is sometimes blended with butane (a "blast mix") to balance yield and selectivity. From a consumer perspective, PHO and BHO products feel similar — the texture and flavor differences are real but subtle. Both are subject to the same residual-solvent regulations (typically <500ppm). PHO is less common than BHO in commercial production because propane equipment costs more and the yield-per-pound is slightly lower, but specialty extractors prize PHO for terpene-forward live extracts.
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