Braze Paste with Flux for Copper from Mexico
Pre-mixed paste containing copper phosphorus brazing alloy and borax flux for refrigeration tubing. Classified under HTS 3810.90.5000 as auxiliary brazing preparation, though borderline with complete pastes. Provides self-fluxing action up to 1500°F.
Duty Rate — Mexico → United States
15%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Import Tips
• Alloy vs pure flux ratio determines 3810.90 vs 8312 classification
• Melting range documentation (1100-1500°F) confirms brazing process
• Phosphorus content <0.05% avoids self-fluxing brazing rod category