Silica Ramming Mass Refractory Mix
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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the primary aggregate is dolomite instead of silica
Dolomite ramming mixes are explicitly separated in 3816.00.10.00 for induction furnace use, based on mineral composition.
If supplied as natural silica sand without refractory binders
Pure silica sands or flours without added binders for high-temp use are classified as natural sands in Chapter 25.
If pre-rammed and shaped into furnace sub-structures
Pre-formed refractory shapes move to Chapter 69 as articles, no longer considered loose compositions.
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Import Tips & Compliance
• 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
Related Products under HTS 3816.00.20.50
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