Of fused quartz or other fused silica
Cullet and other waste and scrap of glass, excluding glass from cathode-ray tubes or other activated glass of heading 8549; glass in the mass: > Glass in the mass: > Of fused quartz or other fused silica
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 7001.00.10.00
Fused Quartz Glass Ingot
A large, solid mass of high-purity fused quartz glass produced by melting silica at high temperatures, used as raw material for further processing into rods, tubes, or optical components. It falls under HTS 7001.00.10.00 as 'glass in the mass' of fused quartz or other fused silica, prior to any shaping or forming beyond the initial melt.
Synthetic Fused Silica Boule
A cylindrical boule of synthetic fused silica created via flame hydrolysis or electric fusion, serving as stock material for semiconductor and UV optic manufacturing. Classified in HTS 7001.00.10.00 because it is glass in the mass of fused silica, unworked except for annealing.
High-Purity Fused Silica Lump
Irregular lumps of high-purity fused silica obtained directly from the melting furnace, used in refractory linings or remelting. HTS 7001.00.10.00 applies as glass in the mass specifically of fused quartz/silica, excluding waste or cullet.
Fused Silica Glass Block
Solid block of fused silica glass cast in rectangular form for machining into precision components like telescope mirrors. Classified under HTS 7001.00.10.00 for glass in the mass of fused quartz, retaining mass character post-annealing.
Electric-Fused Quartz Mass
Bulk mass of quartz glass produced by electric arc fusion, known for low bubble content in high-end applications. It is 'glass in the mass of fused quartz' under HTS 7001.00.10.00, as processes before annealing do not constitute working.
UV-Grade Fused Silica Chunk
Chunks of premium fused silica optimized for ultraviolet transmission, supplied in bulk for optical fabrication. HTS 7001.00.10.00 covers this as unworked glass in the mass of fused silica.
Semiconductor-Grade Fused Quartz Blank
Large blanks of semiconductor-grade fused quartz in mass form for wafer carriers and diffusion tubes. HTS 7001.00.10.00 as it's glass in the mass of fused silica before machining.
IR-Transparent Fused Silica Mass
Bulk fused silica mass with high infrared transmission for thermal imaging domes. Classified HTS 7001.00.10.00 for unworked fused quartz glass in the mass.
Fused Quartz Glass Slab
Rectangular slab of fused quartz glass in bulk mass form, ideal for slicing into substrates or windows in photonics applications. It qualifies for HTS 7001.00.10.00 as unworked glass in the mass of fused silica, where cutting to shape does not affect classification per chapter notes.
Flame-Polished Fused Silica Mass
Fused silica in mass form with flame-polished surfaces for minimal defects, used in fiber optic preform production. Remains in HTS 7001.00.10.00 as polishing here is pre-annealing process per chapter note.