Foamed Slag Thermal Block from Japan
Lightweight blocks produced from expanded foamed slag, used for insulated concrete forms in construction. Falls under HTS 6806.90.00.90 as an expanded mineral material article for heat-insulation, not refractory products of chapter 69.
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
• Certify compressive strength to differentiate from Chapter 69 refractories
• Include production process docs showing expansion without high-temperature firing
• Watch for weight-based duties; declare accurately to avoid under-valuation penalties