Can the SFE units of our company use butane and propane as the SCF?

Can the SFE units of our company use butane and propane as the SCF?

The SFT-110, SFT-110XW, SFT-150, SFT-250, and SFT-NPX-10 units are not designed and manufactured to Class I Division II explosion proof standards and therefore cannot safely be operated with these liquid gas solvents.