Nepheline Syenite Plaster Filler from Mexico
Coarse nepheline syenite (D50=25µm) for gypsum plasters and joint compounds improving sandability. Replaces diatomaceous earth for better finish. HTS 2529.30.0050 'other' nepheline processed to plaster grade.
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
• Hegman gauge 4-5 verifies plaster grade vs. paint extender
• Calcium sulfate reactivity tests prevent gypsum confusion
• Dust suppression agents prohibited; dry powder only