Description
Round filter 90 mm grade (5) is a slow-filtering, dense circular laboratory filter paper intended for fine particle retention. With a filter diameter of 90 mm, the sheets are suited to clarifying filtrations and the collection of fine precipitates where retention takes priority over speed. Packs of 100 pieces provide convenient laboratory stock for repeated analytical and preparative filtrations. These round filters from manufacturer Witeg are specified as grade (5), slow and dense, aligning with applications that need thorough clarification rather than rapid throughput. The pack net weight is 0,072 kg. The 90 mm format fits standard funnels and holders designed for this diameter and supports everyday chemistry, quality-control, and teaching workflows. Dense slow paper of this type helps retain fine solids while delivering a clear filtrate when careful separation is required. Uniform circular cut supports consistent seating in matching apparatus across sample series and routine laboratory filtration tasks.
This article is part of Filter paper, in Filtration.
Key features
- Pack size: 100 pc(s)
- Density: dense
- Product type: Round filter
- Filter diameter: 90 mm
- Grade: (5)
- Filtration speed: slow
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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.