Calcium Silicate Boiler Wall Insulation Blocks from Japan
Dense molded blocks used to line high-pressure boiler walls, offering superior thermal stability and fire resistance from calcium silicate composition. Falls under HTS 6806.90.00.20 as 'other' heat-insulating articles of molded calcium silicate mineral material.
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 engineering drawings showing molded shape and end-use in power plants to support classification
• Ensure no organic binders are present, as they could trigger reclassification to composite materials
• Watch for undervaluation penalties; use transaction value based on comparable industrial sales