Silica-Based Refractory Mortar
A mortar mix of ground silica, clay binders, and additives for joining refractory bricks in high-heat environments like coke ovens. Classified under HTS 3816.00.20 as 'other' refractory compositions, it withstands temperatures up to 1700°C. Ideal for glassmaking furnaces and incinerators.
Import Duty Rates by Country of Origin
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If dolomite ramming mix variant
Specific dolomite compositions have priority subheading over general silica mortars.
If imported as natural silica sand without binders
Unmixed silica is a raw mineral in Chapter 25; binders make it a prepared composition.
If when sold as complete refractory construction set
Assembled refractory goods shift to Chapter 69 for shaped articles.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Provide test reports confirming silica content >90% and bonding strength to comply with refractory definitions
• Label for respiratory hazards from free silica; use UN-approved bags for international shipping
Related Products under HTS 3816.00.20
Andalusite-Based Refractory Guniting Mix
Pneumatic-applied mix with andalusite for wear-resistant coatings in blast furnaces. Classified HTS 3816.00.20 as other refractory compositions, high mullite formation for thermal stability.
Silicon Carbide Refractory Mortar
Abrasion-resistant mortar with SiC grains for cyclone burners and burners. HTS 3816.00.20 other mortars, extreme hardness at 1500°C.
Dolomite-Silica Ramming Mix
Blended ramming for coreless induction furnaces, near 3816.00.10 but 'other' if modified. HTS 3816.00.20.
Bauxite Grain Refractory Concrete
Aggregate bauxite concrete for ladle impact zones.
Mullite Refractory Castable
Synthetic mullite for petrochemical heaters.
Kaolin Clay Refractory Mortar
High-purity kaolin for pottery kilns.