I use a lot of baltic birch, 3/8" thick or 9mm. Over the years I've heard a rumor that there is formaldehyde free B Birch but it comes in 4x8 sheets rather than 5x5. I've talked to my suppliers but no one can verify.
I've looked at various US made maple plys as well that are form. free but they generally don't make 3/8" thick ply. The Europly is a great product but it's quite a bit more than B Birch.
Looking for an alternative or solving the mystery or B Birch that is form. free.
thanks