Czochralski Crystal Puller Heating Chamber from China
This is the graphite or molybdenum heating chamber used in Czochralski crystal growers for pulling monocrystalline silicon boules in semiconductor manufacturing. It falls under HTS 8417.90.00.00 as a part of a nonelectric industrial furnace/oven designed for high-temperature crystal growth processes. The chamber maintains precise thermal gradients essential for defect-free crystal formation.
Duty Rate — China → United States
38.9%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
9903.88.0125%Except as provided in headings 9903.88.05, 9903.88.06, 9903.88.07, 9903.88.08, 9903.88.10, 9903.88.11, 9903.88.14, 9903.88.19, 9903.88.50, 9903.88.52, 9903.88.58, 9903.88.60, 9903.88.62, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(a) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(b) [to this subchapter]
Import Tips
• Verify material certifications (graphite/molybdenum purity) meet semiconductor cleanroom standards; declare as furnace parts not complete machines to avoid Chapter 84 heading 8417.10; ensure thermal shock resistance documentation for customs valuation