Industrial Grade Split Block Mica
Industrial split block mica is crude mica split into precise thin laminae under 0.508 mm, toleranced to 0.203 mm, ready for manufacturing into components. Commonly sourced from India or Madagascar, it's essential for capacitors and peizo devices. HTS 2525.10.0010 covers this unprocessed form explicitly excluding cut or stamped products.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If defective or scrap from splitting process
Mica waste from processing, including broken split blocks, is separately classified.
If further processed into optical elements
Mica made into lenses or prisms for optical use falls under Chapter 90.
If sold as part of electrical insulator assembly
If imported as components of finished insulators rather than raw material, classification shifts.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Obtain supplier affidavits confirming no cutting/stamping to defend against CBP challenges to split block status
• Comply with Lacey Act declarations for plant-like minerals if sourced from protected areas
• Batch-test for iron impurities, as high metal content may redirect to micaceous iron oxides in 2530.90
Related Products under HTS 2525.10.00.10
Split Block Muscovite Mica
Split block muscovite mica consists of thin sheets of muscovite mica, not exceeding 0.508 mm in thickness, split and selected within a 0.203 mm tolerance but not cut or stamped to specific dimensions. This crude form is ideal for further processing into electrical insulators or glazing due to its dielectric properties and heat resistance. It falls under HTS 2525.10.0010 as it precisely matches the definition of split block mica.
Split Block Phlogopite Mica Sheets
Phlogopite split block mica is rifted into uniform thin sheets under 0.508 mm thick, selected to tight tolerances without further shaping. Prized for superior thermal stability up to 1000°C, it's used in high-temperature gaskets and furnace linings. Classified in HTS 2525.10.0010 for its unworked split block form per chapter definitions.
Premium Clear Split Block Mica
Premium clear split block mica features high optical clarity in sheets ≤0.508 mm thick, split to exact tolerances without shaping. Used in vintage stove windows and scientific instruments for its transparency and durability. Meets HTS 2525.10.0010 criteria as unworked split block per statistical note (a).
High Purity Split Block Mica Flakes
High purity split block mica flakes are meticulously split to under 0.508 mm thickness with 0.203 mm uniformity, free of inclusions for sensitive applications. Essential precursor for semiconductor wafer spacing and RF windows. HTS 2525.10.0010 applies to this rifted, unselected crude form.