Mica RF Window Disks from Japan
Circular worked mica disks transparent to radio frequencies used in high-power RF windows for transmitters. Articles of worked mica under HTS 6814.90.00.00.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
Import Tips
• Include RF transmission loss data (<0.1 dB) to prove dielectric properties
• Specify diameter tolerances for waveguide fitting without constituting assemblies
• Avoid metal flanges; flanged windows classify as transmitter parts