Optical Grade Calcium Carbonate from Mexico
High-purity, low-birefringence calcium carbonate crystals used for optical polishing compounds and lens manufacturing aids. It is a separate chemically defined compound of calcium carbonate, meeting Chapter 28 Note 1(a). Synthetic single crystals are available.
Duty Rate — Mexico → Canada
0%
Import Tips
• Confirm the product is not in the form of optical elements, which would be classified in Chapter 90
• Provide documentation of the product's use as a polishing compound or manufacturing aid
• Ensure the crystals are not doped or alloyed with other materials