Sodium Silicate and Potassium Silicate Mold Additive
Liquid mixture of sodium silicate and potassium silicate used as an inorganic binder additive in sand molds for improved green strength and surface finish in metal casting operations. Classified under HTS 3824.99.39.90 for other mixtures of inorganic compounds used in foundry processes. The dual silicate formulation enhances mold stability at high temperatures.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported as individual silicates without mixing
Separate sodium/potassium silicates without blending classify as single inorganic silicates in heading 2839
If includes organic polymers or resins
Addition of organic components changes classification from pure inorganic mixtures
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Require manufacturer's analysis certificate showing >95% inorganic silicate content; check pH stability specifications for foundry use; avoid packaging that suggests retail sale to prevent consumer product reclassification
Related Products under HTS 3824.99.39.90
Calcium Chloride and Sodium Silicate Foundry Binder
A mixture of calcium chloride and sodium silicate used as a binder in foundry mold preparation to create strong, heat-resistant molds for metal casting. This product falls under HTS 3824.99.39.90 as a mixture of two or more inorganic compounds prepared for industrial use in foundries, not elsewhere specified. It provides excellent adhesion and rigidity during the casting process.
Zircon Flour and Sodium Silicate Refractory Mix
Pre-mixed zircon flour (zirconium silicate) and sodium silicate powder formulation for creating high-temperature resistant foundry molds and cores. This inorganic compound mixture under HTS 3824.99.39.90 provides superior thermal shock resistance for precision casting applications. Used extensively in steel and superalloy foundries.
Magnesium Chloride and Calcium Fluoride Flux Mixture
Powdered mixture of magnesium chloride and calcium fluoride used as a foundry flux to clean metal surfaces and improve mold-metal interface during casting. Falls under HTS 3824.99.39.90 as other inorganic compound mixtures for metallurgical processes. Reduces casting defects by removing oxides and sulfides.
Boric Acid and Sodium Tetraborate Hardening Agent
Dry blend of boric acid and sodium tetraborate (borax) used as a chemical hardener for inorganic foundry binders to accelerate setting time and improve mold strength. Classified in HTS 3824.99.39.90 for multi-inorganic compound preparations. Essential for no-bake foundry systems requiring rapid mold production.
Sodium Fluorosilicate and Calcium Hydroxide Catalyst
Specialty catalyst mixture of sodium fluorosilicate and calcium hydroxide for gassing reactions in foundry core production using CO2-hardened silicate binders. HTS 3824.99.39.90 classification for inorganic foundry process chemicals. Enables rapid core formation with excellent dimensional stability.
Aluminum Phosphate and Zinc Phosphate Binder
Two-component phosphate binder system combining aluminum phosphate and zinc phosphate for ceramic shell molds in investment casting. Under HTS 3824.99.39.90 as inorganic mixture for precision foundry applications. Provides high-temperature resistance up to 1700°C for aerospace turbine blades.