Popular among the green-minded because it's made from waste products, M.D.F. stands for medium-density this
Medium Density... [DOC] [TLE] Plant Based Products for a Sustainable civilization [PAR] Nov 6, 2013 ... A novel new form of medium-density fibreboard (MDF) that's both biodegradable 
... the enormous waste that typically accompanies the use of MDF  as it stands 
now, ....