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Pore size is expressed in Daltons, micrometers, nanometers, and angstroms

Pore size is expressed in Daltons, micrometers, nanometers, and angstroms

KD is an abbreviation for kilodalton, equal to a molecular weight cutoff (MWCO) of 1000. A solution with a molecular weight of 1,000,000 is equivalent to 1000 KD.

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Type and working range of filter membranes

Type and working range of filter membranes

Filter membranes used to remove pollutants from water may vary depending on the size and type of the target contaminants (as shown in the figure below). In order of pore size, membrane applications can be classified as microfiltration membranes, ultrafiltration membranes, reverse osmosis membranes, etc., used for bacteria, microorganisms, proteins, and suspended solids respectively.

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Instruction Manual for "HeXin" Microporous Membrane Bacterial Filter

Instruction Manual for "HeXin" Microporous Membrane Bacterial Filter

“Hexin” membranes and filters are currently popular microporous filtration devices internationally. They are equipped with composite folded microporous membrane filter cartridges, which achieve a certain particle filtration effect through microporous screening on the membrane surface. They have advantages such as high filtration precision, good filtrate quality, small filter volume, large flow rate, simple operation, and low production cost. The main materials meet the biosecurity requirements of Grade 6 in the 22nd edition of the United States Pharmacopeia and comply with Chinese standards GB9688-88 and GB/T-17219-1998.

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Rapid wetting method for hydrophilic filter cartridges

Rapid wetting method for hydrophilic filter cartridges

Install the new filter cartridge into the filter housing and fill it with pure water.

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Introduction to Microporous Pleated Filter Cartridges

Introduction to Microporous Pleated Filter Cartridges

Microporous membranes are thin films with a porous structure, with pore sizes generally ranging from 0.025 to 10 μm. They are usually made of polymeric materials such as cellulose esters, polysulfone, polyvinylidene fluoride (PVDF), etc. These materials are processed through phase inversion, stretching, and other methods to form membranes with uniform micropores. For example, cellulose ester microporous membranes have good hydrophilicity and are effective in filtering aqueous solutions; while PVDF microporous membranes have excellent chemical stability and corrosion resistance, suitable for filtering various chemical solutions.

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Introduction to Deep Membrane Stacks

Introduction to Deep Membrane Stacks

A depth membrane stack is a filtration unit composed of multiple layers of membrane materials with different functions. These membrane materials have different pore sizes and properties, typically including microfiltration membranes and ultrafiltration membranes, forming a multi-layered, depth filtration structure. For example, it may include a layer of coarser pre-filtration membrane to intercept larger particles, followed by several layers of membranes with progressively smaller pore sizes to remove finer impurities.

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