I’ve done a liittle research and best I can tell is that phenolic plywood is just an “new name” for HDO plywood.
I searched for plywood on Google and went to the APA site. And HDO is a phenolic resin overlay as is MDO – MDO being cheaper about $60 for a 4×8 sheet while HDO is about $100 per 4×8 sheet (both in 3/4 inch).
does anyone else know of a difference in phenolic vs HDO. I suspect phenolic plywood is just local jargon for an otherwise easily found product.
-- in the prairie no one can hear you scream (this helps when i mess up a project)