Glued Doublet Prism from Japan
Two prisms of different dispersion glasses cemented to form an achromatic prism with reduced chromatic aberration. Falls under HTS 9001.90.50.00 as unmounted compound optical prism for spectroscopy applications requiring color correction. Maintains dispersion while minimizing color fringing.
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
• Specify both glass types, cement type, and achromatic performance data
• Cement bond strength testing required for handling specifications
• Differential expansion coefficient data needed for thermal stability claims