Photographic Developing Filter Papers
Pre-cut filter papers with precise pore structure for darkroom chemical filtration and debris removal. Classified HTS 4823.20.90.00 as specialty filter paper cut to size. Acid-resistant for developer solutions.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If part of complete photographic chemical kits
Photographic chemicals and accessories go to chapter 37
If Jacquard perforated pattern cards
Perforated cards for machines specifically exclude filter use per notes
If lightweight coated for emulsion support
Coated papers meeting mechanical pulp specs classify differently
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Specify pH resistance range; provide darkroom compatibility statements; ensure light-tight packaging declarations
Related Products under HTS 4823.20.90.00
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.
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.