Whatman
Whatman filter papers are world-renowned as the standard for laboratory filtration and are associated with quality, reliability, and customer service.
The innovative features of these filters make them the optimum choice for many filtering techniques. The filters are tested for basic weight, thickness, air flow, and mechanical strength. In addition, special parameters such as particle retention, wicking rate, filtration performance, and surface characteristics can be measured as needed.
Cellulose Filters
Cellulose filters are manufactured from high quality cotton linters which have been treated to achieve a minimum alpha cellulose content of 98%. These cellulose filter papers are used for general filtration and exhibit particle retention levels down to 2.5 µm. A wide range of retention and flow rate combinations are available to suit numerous laboratory applications. The different groups of cellulose filters offer increasing degrees of purity, hardness, and chemical resistance.
Glass Microfiber Filters
Two types of glass microfiber filters manufactured from 100% borosilicate glass: binder free glass microfiber that is chemically inert and binder glass microfiber. These depth filters combine fast flow rates with high loading capacity and the retention of very fine particle, extending into the sub-micron range. Glass microfiber filters can be used at temperatures up to 500°C and are ideal for use in applications involving air filtration and for gravimetric analysis of volatile materials where ignition is involved. The glass microfiber filters have a fine capillary structure and can absorb significantly larger quantities of water than an equivalent cellulose filter, making them suitable for spot tests and liquid scintillation counting methods. The filters can also be made completely transparent for subsequent microscopic examination. The particle loading capacity of a filtration system can be greatly increased by using a prefilter. Whatman glass microfiber filters such as GF/B or GF/D are suited because of the low resistance to fluid flow and high particle loading capacity. Whatman Multigrade GMF 150 is particularly valuable for the prefiltration of larger volumes and solutions that are normally difficult to filter..
Membrane Filters
The membrane filters offer accurately controlled pore size distribution and higher strength and flexibility which ensure reproducibility and consistency. The range includes pore sizes from 0.015 to 12 µm with a wide selection of membrane filters. Sterile and autoclave packs are available for specialized applications. Colored and gridded types are also available.
Munktel
- Filtration and separation technology for laboratory, industrial and environmental market
- Air filter media
- Medical filtration technology
- Archival storage products
Laboratory Filtration products provided include:
- Quantitative filter papers
- General purpose
- Blotting papers
- Soil analysis
- Germination and seed testing
- Sugar laboratories
- Special products
- Extraction thimbles
- Qualitative filter papers
- Chromatography
- Indicator & PH-papers
- Seed testing papers
- Laboratory table paper
- Breweries and wine
- Carrier for aerosols and perfumes
- Microfiltration membranes
Fisherbrand
High quality, low cost filter papers.
Sartorius
Sartorius offer a range of filtration products including Filter Papers, Membrane / Depth Filters, Syringe Filters, Vacuum Filtration and Pressure Filtration.
Sartorius Filter Papers
Sartorius are able to provide High purity filter papers for quantitative, qualitative and technical analyses, glass microfiber and quartz microfiber filters, extraction thimbles and lots of further paper grades for special and customized applications.
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