Magnesium Tungstate Luminescent Grade from Mexico
Magnesium tungstate (MgWO4) of luminescent grade is used in fluorescent screens and lamps, classified as a tungstate under HTS 2841.80.00. It emits blue light under electron excitation.
Duty Rate — Mexico → United States
5.5%
Rate breakdown
9903.05.860%Universal product exemption (U.S. note 52(b))
Import Tips
• Test for luminophore purity to avoid Chapter 32 reclassification per exclusion note
• Declare emission spectrum data for verification against optical material claims
• Ship under low humidity (<40% RH) to prevent hydration during transit