Silica Ramming Mass Refractory Mix from China
A powdered refractory composition of high-purity silica and borax binder used for ramming into linings of induction furnaces. Classified under HTS 3816.00.20.50 as 'other' refractory mortars excluding dolomite mixes and heading 3801 products. It provides excellent thermal shock resistance for molten metal containment up to 1700°C.
Duty Rate — China → United States
40.5%
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
• Provide furnace application specs and silica purity (>98%) certificates to distinguish from general silica powders
• Ensure borax content is declared in SDS; bulk packaging requires proper ventilation labeling for dust hazards