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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If doped or prepared as a luminophore for pigments
Inorganic products used as luminophores are excluded from Chapter 28 per chapter note and classified in heading 3206.
If mixed with other substances or in retail packaging
Complex mixtures or preparations not chemically defined fall under 3824 as chemical products not elsewhere specified.
If of other metals like sodium or not specifically calcium
Other tungstates of metals besides calcium are classified separately in 2841.90.
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Import Tips & Compliance
• Verify purity and chemical composition with lab certificates to confirm classification as chemically defined tungstate; ensure SDS includes CAS number 7790-75-6
• Watch for contamination that could shift to 2841.90; declare exact calcium content to avoid reclassification
Related Products under HTS 2841.80.00.20
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.