HTS Code 6809.90 - Articles of plaster or of compositions based on plaster (excluding plaster bandages for straightening fractures, put up for retail sale; plaster splints for the treatment of fractures; lightweight with plaster agglomerated building boards or articles for heat-insulation, sound-insulation or sound absorption; anatomic and other models for demonstration purposes; non-ornamented boards, sheets, panels, tiles andsimilar articles)