Butane evaporates very quickly.
Every butane and hash oil explosion / fire I’ve heard about happened during extraction either from an equipment failure or inadequate ventilation. It just doesn’t stick around long.
And, at least where I shop most hashoil is made using supercritical CO2 as the solvent. Because the industry knows stoners tilt chemophobic. Seriously, half the scCO2 packages proclaim “MADE WITHOUT CRAZY CHEMICALS”
As if carbon dioxide pressurized to a megapascal and kept at 70C isn’t crazy in itself. Or that carbon dioxide isn’t a chemical.
