Crystal Boule Grinder Spindle Heating Elements from China
Cartridge heaters embedded in grinding spindles for crystal grinders that preheat boules to prevent thermal shock during flat grinding operations. Specified in statistical note (a)(ii)(A) for semiconductor wafer preparation. 8419.90.95 parts enabling controlled heating.
Duty Rate — China → United States
41.5%
Rate breakdown
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]
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• Certify materials for cleanroom compatibility (no contamination risk to silicon)
• Include thermal expansion coefficient matching boule material specifications
• Document as integral to temperature-controlled grinding process vs. aftermarket repair parts