Silicone Elastomer Base Uncured from Mexico
Uncured silicone elastomer base contains silica filler and peroxide catalyst. Still classified as primary form under HTS 3910.00.00.00 if polymer content predominates per notes.
Duty Rate — Mexico → United States
13%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Document filler <50% total weight to maintain primary polymer status
• Temperature-controlled shipping prevents pre-cure issues
• Include shelf-life data in commercial invoice