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Borate-Treated Walnut Cribbing Timbers from Mexico

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 — Mexico → United States

10%

Rate breakdown

9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico

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