Depth filter sheets are used to remove particles from liquids. This means that liquids can be clear-, fine- or sterile-filtered. Filter sheets are ideal for higher particle load filtration, where mere surface filters such as membranes do not provide enough lifetime. With a thickness of 3 – 4 mm, more than 3000 times the size of a 1-micron particle, millions of microparticles can be trapped in every square meter of filter area. Typically, filter sheets consist of a matrix of cellulosic or polymer fiber, enriched with mineral filter aids and held together with a resin binder.
Depth filter sheets are available in various grades for a wide variety of applications. The filter sheets show nominal retention rates from coarse (55 – 20 μm) to fine (15 – 1 μm) to sterile (0.6 – 0.04 μm). Therefore, they can be used for clarifying, fine and sterile filtration. They are available in all common sizes from 47 mm rounds up to 2.4 m × 1.2 m filter sheets. In between, practically all sizes are possible for all the different sheet filters available on the market.
During the filtration process, particles are slowed down within the filter sheet and eventually retained either mechanically by size or by electro-kinetic forces. Due to this effect, a long operating time can be reached before plugging and the depth filter sheets have a holding capacity of up to 4 l/m2.
All filter sheets are also available in lenticular module format.
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