when SAWD is compressed to 10+ pressure and heated to 150C, all SAWD meeting these requirments should turn into a new element, PLYW.

PLYW is solid, slightly less flammable than WOOD (maybe 15, high temp transition to fire at 750C?), damaged into SAWD at 50+ pressure. I suggest making the life value of the SAWD tick down from some number to prevent the PLYW breaking into SAWD and it recompressing.