Other
Articles of stone or of other mineral substances (including carbon fibers, articles of carbon fibers and articles of peat), not elsewhere specified or included: > Other articles: > Containing magnesite, magnesia in the form of periclase, dolomite including in the form of dolime, or chromite > Other
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 6815.91.00.71
Magnesite Crucible for Metal Melting
A high-temperature resistant crucible made primarily from magnesite, used in foundries for melting non-ferrous metals. It falls under HTS 6815.91.00.71 because it contains magnesite as the key mineral substance and is not specified elsewhere in Chapter 68. These crucibles provide excellent thermal shock resistance due to their magnesia content.
Dolomite Refractory Brick for Cement Kilns
Fired bricks composed mainly of dolime (calcined dolomite) designed for lining rotary cement kilns. Classified under HTS 6815.91.00.71 as it contains dolomite and qualifies as an other article of mineral substances, excluding worked monumental stone. Offers superior resistance to alkali attacks in high-temperature environments.
Magnesia Ramming Mix for Steel Ladles
Dry granular magnesia-based material rammed into place to line steel ladles, containing periclase form of magnesia. Falls under HTS 6815.91.00.71 as an other article of specified mineral substances, used in steelmaking for slag resistance. Applied in plastic/ramming form rather than pre-fired shapes.
Chromite Sand for Metal Casting Molds
Foundry-grade chromite sand used to create molds for metal casting, valued for high thermal conductivity. HTS 6815.91.00.71 applies as it contains chromite and constitutes an article not elsewhere specified in Chapter 68 exclusions. Processed to uniform grain size for molding applications.
Dolomite Powder for Rubber Filler
Micronized dolomite powder used as reinforcing filler in rubber compounds for tires and belts. Classified HTS 6815.91.00.71 due to dolime content and status as processed mineral article excluded from Chapter 25. Provides cost-effective extension and heat resistance in polymer applications.
Magnesia Ceramic Kiln Furniture Set
Set of magnesia shelves, props, and saggers used to support ceramics during firing in kilns. HTS 6815.91.00.71 because it contains periclase magnesia and functions as mineral articles not excluded by Chapter 68 notes. Withstands repeated high-temperature cycles without contamination.
Periclase Grain for Refractory Guniting
Coarse periclase (magnesia) grains mixed with binders for pneumatic application to repair furnace linings. Falls under HTS 6815.91.00.71 as containing periclase in article form for industrial repair. Enables hot-repair without furnace shutdown.
Chromite-Magnesite Roofing Granules
Colored granules containing chromite and magnesite applied to asphalt shingles for UV protection and aesthetics. HTS 6815.91.00.71 classification for mixed mineral articles not covered by Chapter exclusions like Chapter 68(k) furniture. Enhances granule durability and color stability.
Dead Burned Magnesite Balls for Sintering
Spherical dead burned magnesite aggregates used as sintering aids in refractory brick production. Classified HTS 6815.91.00.71 for magnesia-containing articles in manufacturing process. High density promotes uniform brick firing.
Dolomite Ladle Nozzle Inserts
Disposable dolomite inserts for steel ladle nozzles to control molten steel flow and prevent clogging. HTS 6815.91.00.71 as dolomite-containing articles for metallurgical use, excluding tool parts of Chapter 82. Provides clean separation during teeming.