DDAC Treated Basswood Structural Timbers from Japan
Basswood timbers treated with didecyldimethylammonium chloride (DDAC) for light structural framing. HTS 4403.12.0060 nonconiferous rough other category. Quaternary ammonium compound effective against fungal decay in humid environments.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Provide ICC-ES evaluation reports for structural building code acceptance
• Document fastener compatibility with quaternary treatments
• Confirm minimum cross-section for rough timber specifications