Quantitative Filter Paper Sheets
Pre-cut sheets of ashless filter paper designed for gravimetric analysis in laboratories, with high purity and controlled porosity. Classified under HTS 4823.20.90.00 as filter paper cut to size or shape, other than rolls. Meets requirements for precise analytical filtration excluding common qualitative grades.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If supplied in rolls
Rolls of filter paper fall under the specific subheading for rolls, while cut sheets go to 'other'
If coated for special printing
Coated lightweight paper shifts to chapter 48 printing paper headings if coating exceeds functional thresholds
If imported as complete lab filter apparatus
Assembled lab instruments with filter paper components classify under chapter 90 as scientific apparatus
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Import Tips & Compliance
• Verify ash content and porosity specs match quantitative standards to avoid reclassification; provide lab test certificates; ensure cut-to-size dimensions are documented to distinguish from rolls
Related Products under HTS 4823.20.90.00
Glass Microfiber Filter Discs
Circular discs of borosilicate glass microfiber filter paper cut to standard diameters (e.g., 47mm) for air monitoring and liquid filtration. Falls under HTS 4823.20.90.00 as specialty filter paperboard cut to shape, other than rolls. High efficiency for fine particle retention.
Sterile Syringe Filter Membranes
Pre-cut circular filter membranes (e.g., 0.22 micron PVDF) for HPLC sample prep and sterile filtration, individually packaged. HTS 4823.20.90.00 covers these as filter paper cut to shape, other than rolls. Designed for single-use syringe attachment.
Coffee Filter Papers Cut to Shape
Cone-shaped or basket-style filter papers cut precisely for drip coffee makers, made from unbleached pulp. Classified in HTS 4823.20.90.00 as other filter paper cut to shape. Optimized porosity for optimal extraction.
Industrial Buchner Funnel Filter Sheets
Perforated circular filter sheets sized for Buchner funnels (e.g., 90mm diameter) used in vacuum lab filtration. HTS 4823.20.90.00 as other filter paper cut to size/shape. High wet strength for chemical processing.
Aquarium Filter Pads Cut to Size
Pre-cut rectangular pads of activated carbon-impregnated filter paper for aquarium mechanical filtration. Under HTS 4823.20.90.00 as other filter paperboard cut to shape. Removes impurities in freshwater systems.
HVAC Air Filter Media Sheets
Cut-to-size pleated filter paper sheets (MERV 8-13) for residential HVAC systems, with antimicrobial treatment. HTS 4823.20.90.00 covers these as other filter paper cut to shape. Balances airflow and particle capture.