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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If classified as a complex salt rather than simple tungstate
Double or complex salts of inorganic bases fall under 2842 or related headings per chapter notes.
If incorporated into iron/steel pig iron production
Mixtures containing these compounds prepared for metal production may shift to Chapter 72.
If in chemical preparations for industrial use
Preparations containing chemically defined compounds but not pure fall under 3824.
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Import Tips & Compliance
• Include material safety data sheets specifying tungstate content over 90%; test for heavy metal impurities
• Common pitfall: bulk shipments misdeclared as ores (2613); segregate from other metal salts during storage
Related Products 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.
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.