Articles having a hardness equivalent to 9 or more on the Mohs scale
Ceramic wares for laboratory, chemical or other technical uses; ceramic troughs, tubs and similar receptacles of a kind used in agriculture; ceramic pots, jars and similar articles of a kind used for the conveyance or packing of goods: > Ceramic wares for laboratory, chemical or other technical uses: > Articles having a hardness equivalent to 9 or more on the Mohs scale
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 6909.12.00.00
Alumina Crucible for Laboratory Use
High-purity alumina crucible designed for high-temperature melting and analysis in chemical laboratories. It features a hardness of 9 on the Mohs scale due to its sintered aluminum oxide composition, meeting Chapter 69 requirements for fired ceramic products used in technical applications. Exceeds standard porcelain hardness for handling corrosive substances.
Zirconia Grinding Media Balls
Sintered zirconia ceramic balls used in ball mills for fine grinding in chemical and pharmaceutical labs. Achieves Mohs hardness of 9+ from yttria-stabilized zirconia, fired per Chapter 69 standards for technical durability. Ideal for abrasion-resistant milling of hard materials.
Silicon Carbide Laboratory Mortar and Pestle
Fired silicon carbide set for grinding hard samples in analytical chemistry labs. Exhibits Mohs hardness of 9.5, qualifying as technical ceramic ware under HTS 6909.12 for its resistance to acids and high wear. Shaped and fired to Chapter 69 specifications.
Fused Silica Distillation Flask
High-hardness fused silica flask for precise distillation in chemical research labs. Fired ceramic body reaches Mohs 9+, as per Chapter 69 for technical uses in handling volatile compounds. Translucent and low-absorption for purity.
Boron Nitride Crucible for Technical Furnaces
Hexagonal boron nitride ceramic crucible for high-purity melting in semiconductor labs. Achieves Mohs hardness over 9 post-firing, fitting HTS 6909.12 for chemical/technical receptacles. Excellent thermal shock resistance.
Aluminum Oxide Technical Packing Jars
Dense aluminum oxide jars for packing corrosive goods in chemical transport. Hardness 9+ on Mohs scale from fired ceramic process, under HTS 6909.12 for technical conveyance articles. Impervious to most reagents.
Silicon Nitride Laboratory Funnels
Fired silicon nitride funnels for filtration in harsh chemical environments. Mohs hardness exceeds 9, qualifying for Chapter 69 technical wares in HTS 6909.12. High corrosion and thermal resistance.
Zirconium Oxide Analytical Boats
Sintered ZrO2 ceramic boats for TGA/DSC analysis in materials labs. Hardness 9+ Mohs post-firing, per HTS 6909.12 for technical laboratory receptacles. Precise dimensions for high-temp testing.
Tungsten Carbide Ceramic Grinding Discs
Fired WC ceramic discs for sample preparation in geological labs. Meets 9+ Mohs hardness for durability in technical grinding, under Chapter 69 HTS 6909.12. Suitable for rock and mineral pulverization.
High-Purity Alumina Evaporating Dishes
99.8% alumina ceramic dishes for solvent evaporation in chemistry labs. Hardness equivalent to 9+ Mohs, fired for technical use in HTS 6909.12. Chemically inert and thermally stable.