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