... . 2011 fabric sofa setRaw material guarantee A) Wood frame a) High quality solid wood,high density, high hardness,Fully kiln ... "blocked", nailed, and glued for strength and durability.Wood frame joints are conducted viscose processing, and more effective ... : Hazardous material meets the GB18581 standard requirements. F) Wood coatings: hazardous substances meet the GB18581-2001 standard requirements. ...