Chapter 2525 — Customs Tariff Headings

Biotite Mica Splittings

Biotite mica splittings rifted into loose sheets for industrial grinding, prior to any powdering or further processing. This product falls under tariff item 2525.10.00 as crude mica rifted into sheets or splittings, not yet subjected to processes beyond rifting.

Crude Muscovite Mica

Natural crude muscovite mica mined directly from deposits, consisting of unprocessed sheets or blocks with irregular shapes and thicknesses. This product falls under tariff item 2525.10.00 as crude mica that has not been further rifted, cut, or processed beyond extraction.

High Purity Split Block Mica Flakes

High purity split block mica flakes meticulously split to under 0.508 mm thickness with 0.203 mm uniformity, free of inclusions for sensitive applications. This product falls under tariff item 2525.10.00 as crude mica rifted into sheets, essential precursor for semiconductor wafer spacing and RF applications.

Indian Muscovite Crude Mica

Crude muscovite mica blocks sourced from Indian deposits, unrifted and irregular in shape. This product falls under tariff item 2525.10.00 as crude mica, not yet rifted into sheets or splittings, and is a dominant global source for electrical and paint grade processing.

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. This product falls under tariff item 2525.10.00 as mica rifted into sheets, commonly sourced from India or Madagascar.

Lepidolite Crude Mica

Crude lepidolite mica ore containing lithium, extracted in block form without rifting. This product falls under tariff item 2525.10.00 as crude mica, distinguished from lithium concentrates, and is primarily imported for lithium extraction and ceramic applications.

Madagascar Phlogopite Sheets

Phlogopite mica sheets rifted from Madagascar blocks, noted for golden color and flexibility. This product falls under tariff item 2525.10.00 as mica rifted into sheets, pre-split block processing, used in furnace windows and gaskets.

Mica Splittings in Book-Pack

Thin mica laminae split into book-form packs, suitable for manufacturing agglomerated mica products. This product falls under tariff item 2525.10.00 as crude mica rifted into sheets or splittings, as defined in statistical note (b).

Muscovite Mica Book-Form Splittings

High-quality muscovite mica split into book-form stacks of laminae, per statistical note (b). This product falls under tariff item 2525.10.00 as rifted splittings suitable for agglomerated mica production, essential for high-voltage insulation manufacturing.

Phlogopite Mica Sheets

Phlogopite mica rifted into thin, flexible sheets from crude blocks, retaining natural cleavage without cutting to specific dimensions. This product falls under tariff item 2525.10.00 as mica rifted into sheets or splittings, suitable for various industrial applications.

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. This product falls under tariff item 2525.10.00 as crude mica rifted into sheets, used in vintage stove windows and scientific instruments.

Ruby Mica Crude Blocks

Unprocessed ruby muscovite mica in large crude blocks, directly from mining operations. This product falls under tariff item 2525.10.00 as crude mica not yet rifted into sheets, prized for its reddish hue and dielectric properties in specialized applications.

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 product falls under tariff item 2525.10.00 as crude mica rifted into sheets.

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. This product falls under tariff item 2525.10.00 as crude mica rifted into sheets, prized for superior thermal stability up to 1000°C.

Split Mica Sheets for Electronics

Mica rifted into uniform sheets exceeding split block thickness, for capacitor windows. This product falls under tariff item 2525.10.00 as pre-processed sheets before final machining, providing superior insulation in high-frequency applications.

Dry Ground Muscovite Mica Powder 325 Mesh

Dry ground muscovite mica powder, 325 mesh, used as an extender in oil-based paints and joint compounds. The fine particle size and pure mica composition qualify it as mica powder under tariff item 2525.20.00.

Mica Powder for Pearl Pigment

High-purity mica powder prepared as a substrate for pearlescent effects in automotive paints. It remains mica powder under tariff item 2525.20.00 because it is not yet coated with titanium dioxide or other substances.

Micronized Phlogopite Mica Powder

Micronized phlogopite mica powder with a particle size of 5-10 microns, used in injection molding compounds and cosmetics. The extreme fineness qualifies it as mica powder under tariff item 2525.20.00.

Muskovite Mica Powder

Finely ground muscovite mica powder, a potassium aluminum silicate mineral, used as a filler in paints, plastics, and cosmetics. It qualifies as mica powder under tariff item 2525.20.00.

Phlogopite Mica Powder

Phlogopite mica ground into a fine powder, known for its heat resistance, used in electrical insulation and rubber compounds. It is classified as mica powder under tariff item 2525.20.00.

Synthetic Fluorphlogopite Mica Powder

Synthetic fluorphlogopite mica powder produced in the laboratory, offering superior thermal stability for high-end electronics and pearlescent pigments. Despite being synthetic, it is classified as mica powder under tariff item 2525.20.00.

Wet Ground Mica Powder

Wet ground mica powder processed via wet grinding to produce ultra-fine powder for use in sheet molding compounds and cosmetics. It falls under tariff item 2525.20.00 as mica powder, regardless of wet or dry grinding method.

Electrical Grade Mica Reject Waste

Rejects from quality control of electrical-grade mica sheets, containing defects such as inclusions or cracks, are classified as mica waste. These scraps are unsuitable for precision electrical applications but retain value for recycling into mica powder or other industrial uses. The material falls under tariff item 2525.30.00 as unworked mica waste.

Industrial Mica Waste Fines

Fine particulate byproducts from processing and trimming mica sheets for industrial applications are classified as mica waste. This material consists of small fragments and dust that are not suitable for direct use but can be further processed. It falls under tariff item 2525.30.00 as unworked mica waste.

Mica Mining Tailings Dust

Fine dust tailings from mica ore beneficiation and washing operations are classified as mica waste. This low-grade material is suitable for low-end fillers or landfill amendment after processing. It falls under tariff item 2525.30.00 as unworked mica waste.

Mica Powder Mill Feed Waste

Pre-ground coarse mica waste prepared as feedstock for final powder milling operations is classified as mica waste. This semi-processed material is not fully micronized and is used directly in coarse applications. It falls under tariff item 2525.30.00 as unworked mica waste.

Mica Sheet Trimmings Waste

Trimmings and edge scraps from cutting mica sheets for electrical insulators represent classic mica waste. These irregular fragments are unsuitable for precision applications but can be ground for reuse. They fall under tariff item 2525.30.00 as unworked mica waste.

Mica Splitting Operation Scrap

Irregular scraps and rejects from mica splitting operations, too fragmented for standard splittings, are imported as mica waste. These pieces are typically milled into mica flakes for decorative or industrial uses. They fall under tariff item 2525.30.00 as unworked mica waste.

Muscovite Mica Drilling Waste

Dust and cuttings from drilling muscovite mica blocks for electronic components qualify as mica waste. This fine waste material is commonly repurposed in cosmetics or rubber compounding after grinding. It falls under tariff item 2525.30.00 as unworked mica waste.

Phlogopite Mica Processing Waste

Waste from processing phlogopite mica, a heat-resistant variety used in high-temperature applications, falls under this tariff item as unworked mica waste. This includes dust, chips, and rejects from splitting operations. The material is suitable for recycling into industrial fillers or insulation products.