Description
Round filter papers with a diameter of 90 mm in black ribbon grade 1 are designed for rapid qualitative filtration in chemical and life-science laboratories. The fast flow characteristic of this grade supports efficient separation of precipitates and suspended solids from liquids during routine analytical and preparative work. Each pack contains 100 pieces, offering a practical supply for everyday gravity filtration on the bench. These circular filters from manufacturer Witeg seat evenly in standard funnels and filtration assemblies used in teaching, research, and quality-control environments. With a filter diameter of 90 mm, they suit common laboratory funnel sizes and deliver consistent handling from sheet to sheet. Black ribbon grade 1 is a classic choice when filtration speed is prioritised for qualitative separations. The round format helps maintain uniform contact with the funnel wall and stable flow during successive samples. Suitable for general laboratory filtration tasks where a fast black-ribbon paper at 90 mm diameter is required.
This article is part of Filter paper, in Filtration.
Key features
- Pack size: 100 pc(s)
- Filter diameter: 90 mm
- Grade: black ribbon 1
- Filtration speed: fast
- Form: round filter
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Questions about Round filter 90mm
What is this article?
Round filter 90mm is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Filter paper, inside Filtration, in Lab consumables.
Filter paper is a cellulose sheet of a stated retention and speed. Qualitative paper clarifies. Quantitative, ashless paper is for a precipitate that will be weighed or ashed, because the paper itself leaves almost no ash. The diameter has to match the funnel.
Filtration holds back what is larger than the pores and lets the rest through. Paper is the ordinary laboratory filter. A membrane has a stated pore size and a polymer that must survive the solvent. A syringe filter is that membrane in a housing on a syringe. Glass fibre takes a higher dirt load. Ultrafiltration holds back macromolecules and passes salts. The pore size, the chemical compatibility and the volume are the three choices. Laboratory apparatus around filtration is indexed under ISO laboratory apparatus.
Which category should I open next?
The category is Filtration. The sub-category is Filter paper. The catalogue is Lab consumables.
Shelves beside this one are Sintered glass filter plates & discs, Syringe filters, Filter cartridges & capsules, Membrane filters, Glass & quartz fibre filters, Bottle-top & vacuum filtration units, Ultrafiltration & concentrators, Filtration accessories, Extraction thimbles and Dialysis tubing & devices.
What should I check before I order?
When this page shows a safety data sheet, use that manufacturer file. Hazard text does not belong in the sales description. For a pack size, a grade or a certificate that is not on the page, send a quote request or contact the team.
How does ordering and shipping work?
Luminix Health distributes this article from the heart of Europe. Delivery across Europe, two to five days when in stock. Standard delivery is free from €250 excl. VAT. Cold-chain goods and dangerous goods under ADR are never included in that free delivery. The terms are in the Shipping Policy. The full brand index is on shop by brand. Who we are is on about us.
Which other categories should I open?
The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.
