Functionally OK?  IMHO yes.

Legally OK?  Depends on the state and whether you convert to 134a first,
etc.

This is debated on this list thoroughly about twice a year.  As we say:
"Check the archives."

I use ES-12a from AutoRefrigerants.com

Larry A.

Mike Miller wrote:

>Volks,
>
>Is it OK to use one of the butane based working fluids, Duracool in this
>case, in an R12a system?
>
>Mike
>
>
>