Borate-Treated Walnut Cribbing Timbers from Canada
Rough walnut timbers diffusion-treated with borates for temporary mine shaft cribbing and construction shoring. Classified HTS 4403.12.0060 as nonconiferous other preserved rough wood. Provides insect resistance without heavy chemical impregnation.
Duty Rate — Canada → United States
10%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Provide MSHA certification for underground mine applications
• Specify load-bearing capacity testing for structural applications
• Document diffusion treatment process differentiating from surface applications