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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If phlogopite variety
Phlogopite mica, known for higher heat resistance, falls under the statistical suffix for other split block mica types.
If cut, stamped, or machined to specific shapes
Once worked beyond splitting, such as cutting into plates or tubes, it becomes worked mica under Chapter 68.
If in book-form or loose pack for agglomeration
Mica splittings prepared for built-up mica production are classified separately from split block under 2525.20.
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Import Tips & Compliance
• Verify thickness (≤0.508 mm) and tolerance (±0.203 mm) with lab certification to confirm split block classification and avoid reclassification as crude mica
• Provide geological origin documentation, as some mica sources may trigger conflict mineral reporting under Dodd-Frank
• Ensure packaging prevents breakage, as damaged sheets could be deemed mica waste (2525.30) upon inspection
Related Products under HTS 2525.10.00.10
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.
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.
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.