Insulating Firebrick (IFB) 26 Grade from China
IFB 26 grade insulating firebricks feature low thermal conductivity due to high porosity, fired from clay-kaolin mixes for backup furnace insulation. Service limit around 1430°C makes them ideal for energy-efficient linings. HTS 6902.90.10 applies to these lightweight refractory bricks.
Duty Rate — China → United States
37.5%
Rate breakdown
9903.05.3112.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of China, as provided for in U.S. note 52 to this subchapter
9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Import Tips
• Measure and declare bulk density (<0.8 g/cm³ typical) to confirm insulating classification
• Avoid moisture exposure pre-import; provide dry storage certificates
• Distinguish from dense bricks via thermal conductivity test data