Description
Round filter Rotband (4) is a qualitative laboratory filter paper intended for medium to slow filtration. The 90 mm filter diameter provides a larger working area for clarifying suspensions, collecting precipitates, and preparing samples in research, teaching, and quality-control laboratories. Rotband (4) grade paper offers a practical balance of retention and flow for routine wet-chemistry steps where fine particulates must be removed without excessive filtration time. Packs contain 100 pieces for convenient laboratory stocking, with a net weight of 0,088 kg per pack. These circular filters from manufacturer Witeg are sized for standard funnels and filtration set-ups used across chemistry, life sciences, and industrial analytical environments. Uniform dimensions aid reproducible handling when preparing filtrates or clarifying solutions ahead of titration, instrumental analysis, or further processing. Choose this format when a medium-to-slow qualitative round filter of 90 mm is required for everyday laboratory filtration tasks.
This article is part of Filter paper, in Filtration.
Key features
- Pack size: 100 pc(s)
- Product type: Round filter paper
- Grade: Rotband (4)
- Filtration speed: Medium to slow
- Filter diameter: 90 mm
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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. Articles in stock ship within 2–5 business days. 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.