Preform Collapsing Furnace from Canada
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 — Canada → United States
10%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Specify collapse temperature profiles (2000°C+) unique to silica glass
• Avoid general glass annealing oven classification (8417)
• Pressure differential system documentation