Of calcium

Salts of oxometallic or peroxometallic acids: > Tungstates (wolframates) > Of calcium

Duty Rate (from China)

30.5%

MFN Base Rate5.5%

9903.91.01+25%

Effective with respect to entries on or after September 27, 2024, articles the product of China, as provided for in subdivision (b) of U.S. note 31 to this subchapter

9903.03.03+0%

Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter

Total Effective Rate30.5%

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Products classified under HTS 2841.80.00.20

Calcium Tungstate Powder

Pure calcium tungstate (CaWO4) powder, a chemically defined salt of tungstic acid, used in the production of phosphors for fluorescent lamps and X-ray screens. It falls under HTS 2841.80.0020 as a tungstate of calcium. This inorganic compound is essential for luminescent applications due to its scintillation properties.

Calcium Tungstate Scintillation Crystals

Synthetic single crystals of calcium tungstate grown for use as scintillation detectors in radiation measurement equipment. Classified under HTS 2841.80.0020 as chemically defined calcium tungstates. These crystals emit light when exposed to ionizing radiation, vital for medical imaging and particle physics.

Technical Grade Calcium Tungstate

Technical grade calcium tungstate granules used as a flux in welding electrodes and metallurgy to stabilize tungsten content. It qualifies for HTS 2841.80.0020 as a salt of peroxometallic acid (tungstate) of calcium. This form provides controlled tungstate release in high-temperature applications.

Calcium Tungstate Luminescent Powder

Fine calcium tungstate powder activated for blue luminescence in cathode ray tubes and lighting phosphors. Falls under HTS 2841.80.0020 as a chemically defined tungstate of calcium per Chapter 28 notes. Used in legacy display technologies and specialty lighting.

Synthetic Scheelite Calcium Tungstate

Synthetic scheelite, the mineral form of calcium tungstate (CaWO4), produced for phosphor manufacturing and gemstone simulation. Classified in HTS 2841.80.0020 as chemically defined calcium tungstates. Distinguished from natural mineral ores by laboratory synthesis.