Diatomaceous Earth Abrasive Grade
Calcined diatomite (amorphous silica from fossil diatoms) selected for gentle abrasive polishing in metal buffing. Under HTS 2513.20.9000 as 'other natural abrasives,' separate from filter-grade under 2512.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If flux/calcined for filtration or insulation
Kieselguhr/diatomite primarily for non-abrasive uses stays in 2512.
If refined to high-purity silica
Processed to >99% SiO2 becomes artificial silica under chemicals.
If for lightweight refractory bricks
Expanded/processed into refractory shapes moves to Chapter 69.
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Import Tips & Compliance
• ,Document calcination process; uncalcined remains potential 2512
• Test for crystalline silica conversion which could trigger Chapter 28
Related Products under HTS 2513.20.90.00
Natural Garnet Abrasive Grit
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Natural Wollastonite Abrasive Powder
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Natural Olivine Sand Abrasive
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