Consisting wholly of inorganic substances
Prepared binders for foundry molds or cores; chemical products and preparations of the chemical or allied industries (including those consisting of mixtures of natural products), not elsewhere specified or included: > Prepared additives for cements, mortars or concretes: > Consisting wholly of inorganic substances
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
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)
Products classified under HTS 3824.40.20.00
Calcium Sulfonate Concrete Accelerator
A powdered additive made entirely from inorganic calcium sulfonate compounds used to accelerate the setting time of concrete in cold weather applications. It falls under HTS 3824.40.20.00 as a prepared additive for cements and concretes consisting wholly of inorganic substances. This product enhances early strength development without affecting final compressive strength.
Sodium Silicate Cement Hardener
A liquid preparation of sodium silicate (water glass) used as a hardener and dust proofer for concrete floors and surfaces. Classified under HTS 3824.40.20.00 because it consists wholly of inorganic silicate compounds prepared for cement and concrete applications. It penetrates concrete to form a hardened silica gel layer.
Zinc Oxide Concrete Corrosion Inhibitor
An inorganic powder additive containing zinc oxide compounds designed to inhibit corrosion of steel reinforcement in concrete structures. It qualifies for HTS 3824.40.20.00 as a prepared inorganic additive specifically for cement and concrete use. The zinc reacts to form protective layers on rebar surfaces.
Potassium Ferrate Concrete Waterproofer
A specialized inorganic salt preparation of potassium ferrate used to waterproof and strengthen concrete by reacting with water to form insoluble complexes. Falls under HTS 3824.40.20.00 as it consists wholly of inorganic ferrate compounds prepared for concrete applications. Provides permanent internal waterproofing.
Lithium Silicate Concrete Densifier
A colloidal solution of lithium silicate used to densify and harden freshly placed concrete surfaces by chemical reaction forming calcium silicate hydrate. Classified HTS 3824.40.20.00 as wholly inorganic prepared additive for concrete. Increases surface abrasion resistance dramatically.
Magnesium Oxy Chloride Concrete Accelerator
A dry powder mix of magnesium oxide and magnesium chloride used to produce fast-setting magnesium oxychloride concrete for rapid repair applications. HTS 3824.40.20.00 applies as it's composed entirely of inorganic magnesium compounds prepared for cement use. Sets in 10-30 minutes.
Sodium Aluminate Cement Accelerator
An inorganic solution of sodium aluminate that accelerates cement hydration and provides early strength in oil well cementing applications. Classifies under HTS 3824.40.20.00 as wholly inorganic prepared concrete additive. Essential for high-temperature well cementing.
Gypsum-Based Concrete Retarder
A powdered inorganic blend primarily of calcined gypsum and phosphates used to extend working time of concrete in hot weather conditions. HTS 3824.40.20.00 because it's wholly inorganic and specifically prepared for cement retardation. Prevents flash set in mass concrete pours.
Colloidal Silica Concrete Densifier
Nano-particle suspension of amorphous silica in water used to chemically densify concrete by filling capillary pores and reacting with calcium hydroxide. Wholly inorganic, qualifies for HTS 3824.40.20.00 as prepared concrete additive. Increases durability by 40-50%.
Aluminum Powder Concrete Aerating Agent
Fine aluminum powder prepared with inorganic gas-generating activators to produce air-entrained concrete for freeze-thaw resistance. HTS 3824.40.20.00 as wholly inorganic prepared concrete additive. Creates stable microscopic air bubbles in the mix.
Sodium Thiocyanate Concrete Antifreeze
An inorganic salt solution of sodium thiocyanate used as a low-temperature accelerator and antifreeze admixture for concrete placement below freezing. Prepared specifically for cement use, wholly inorganic per HTS 3824.40.20.00. Lowers freezing point without chlorides.
Barium Metaborate Concrete Fire Retardant
Inorganic barium metaborate powder incorporated into cement mixes to impart fire resistance and reduce combustible material passage. HTS 3824.40.20.00 as wholly inorganic prepared concrete additive. Releases water of hydration at high temperatures.
Nano-Clay Concrete Viscosity Modifier
Dispersed montmorillonite nano-clay platelets used to modify concrete rheology and reduce bleeding/segregation in self-consolidating concrete. Wholly inorganic mineral preparation for HTS 3824.40.20.00. Improves flow without segregation.
Strontium Carbonate Concrete Shrinkage Compensator
Inorganic strontium carbonate powder added to cement to compensate drying shrinkage through expansive crystal formation. Prepared for concrete use per HTS 3824.40.20.00, wholly inorganic. Reduces cracking in restrained concrete elements.
Cerium Oxide Concrete Polishing Accelerator
Nano-cerium oxide slurry used to accelerate mechanical polishing of concrete floors by chemically softening surface cement paste. Wholly inorganic prepared additive for concrete finishing under HTS 3824.40.20.00. Achieves mirror finish rapidly.