Bentonite Clay and Calcium Hydroxide Core Sand Additive from Mexico
Powdered mixture of bentonite clay (aluminosilicate) and calcium hydroxide designed to enhance green strength and collapsibility of foundry core sands. Falls under HTS 3824.99.39 as a prepared blend of inorganic compounds for foundry mold/core production. Critical for producing defect-free metal castings.
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
• Certify bentonite montmorillonite content minimum 70% for foundry grade; include moisture content specs (8-12%) in COA; watch for alkalinity hazards in safety data