Synthetic Scheelite Calcium Tungstate from Canada
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.
Duty Rate — Canada → United States
5.5%
Rate breakdown
9903.05.860%Universal product exemption (U.S. note 52(b))
Import Tips
• Provide synthesis certificates differentiating from natural scheelite ore (2613); assay reports confirming >95% CaWO4
• Pitfall: natural impurities may trigger mineral headings