Preform Collapsing Furnace from Japan
High-temperature furnace that heats MCVD-deposited tubes to collapse internal layers into solid optical fiber preforms under controlled atmosphere. Produces symmetrical core-cladding structure. HTS 8475.21.00.00 for this hot working glass machinery.
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 collapse temperature profiles (2000°C+) unique to silica glass
• Avoid general glass annealing oven classification (8417)
• Pressure differential system documentation