Crystal Boule Grinder Spindle Heating Elements from Japan
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 — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
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