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 life-time. With a thickness of 3 to 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 consists of matrix of cellulosic or polymer fiber, enriched with mineralic filter aids and held together with a resin binder.
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