High-Alumina Refractory Firebrick from Japan
A refractory brick composed of over 50% alumina (Al2O3), fired after shaping to withstand extreme temperatures above 1700°C. Used primarily in industrial furnaces and kilns for lining to protect against molten metal and slag corrosion. Falls under HTS 6902.20.50.10 as a refractory ceramic constructional good containing predominantly alumina.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Provide chemical composition certificates confirming >50% Al2O3 content and firing temperature records to verify refractory classification
• Ensure documentation distinguishes from non-refractory ceramics (Chapter 69 notes exclude unfired or low-temp heated articles)
• Avoid misclassification as building bricks (6904); specify high-temperature end-use in commercial invoice