Insulating Firebrick (IFB) 26 Grade from Japan
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 — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
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