Monafilament Filter Fabrics
Monafilament Filter Fabrics

Monafilament Filter Fabrics

monofilament filter fabrics are ideal materials for sieving, straining or filtering most liquids, powders or sludges. The term ‘Monofilament’ means that each thread used in the construction of the cloth is a single smooth solid strand instead of many smaller diameter threads twisted together, as in a spun or multifilament material. These monofilament threads are perfectly round in section and are extruded to very precise and uniform diameters.

Their advantages are:-

a) due to their uniformity they can be woven with great precision to give exact and regular apertures,

b) the resulting material has a very smooth surface so that the filtered particles will easily separate from it,

c) they have great strength and elasticity.

After weaving, our fabrics undergo a finishing process to add the properties required for specific applications. During the finishing process, the fabric is scoured to remove any foreign substances and the yarns are then stabilised within the weave in order to eliminate shrinkage by a process known as ‘heat setting’.

Monofilament Nylon 6.6 Filter Cloth

Monofilament Nylon is a versatile material due to its great strength, flexibility, long life and resistance to abrasion. Nylon has excellent resistance to most common solvents and will operate continuously at temperatures up to 100°C in the chemical pH range 7-14. Its chemical and physical properties are shown in
the table below.

Monofilament Polyester Filter Cloth

Monofilament Polyester is particularly recom-mended for use in manufacturing conditions in excess of 100°C. It is suitable up to a maximum working temperature of
150°C in the chemical pH range 1-7.

Alternative Materials

Although Nylon and Polyester are satisfactory for most screening applications, we also have a range of Polyethylene, Polypropylene, PTFE, Silk, Nomex, etc.
Cut to Bangladesh- you can see local village women at a pond in Matlab, Bangladesh, going about their daily chores of washing vegetable and utensils. One woman stretches a sari across the mouth of the water-collecting pot or kalash before filling the pot with water. This sari acts as a filter and is meant to make the water potable and it will be used for drinking and cooking.

This kind of cloth filter is used very commonly in Bangladesh and is a very basic and inexpensive method of getting rid of impurities in drinking water. Water that is filtered via this method has a much lower pathogen count than one that is not filtered. However, it must be understood that this water is not completely safe for drinking. However, for people with few means and limited options, it proves to be a very useful tool.

In Bangladesh, this is how the sari filter is made: an old sari is folded into either 4 or 8 layers. This multi-fold cloth is then stretched across the mouth of a container that will hold the filtered surface water. Under normal circumstances, it is more than enough to simply rinse the cloth and dry it out in the sun. However, during the monsoon, it is best to use an inexpensive disinfectant to cleanse the material. Generally, a cotton sari is used to form this filter. Other materials can be used as well though they may not be able to filter the water as effectively as cotton cloth does. It is best to use used-cloth rather than new material as the fibres tend to close-in when they are washed thus making the filter more effective.

Effectiveness of the Cloth Filter

Though this cloth filter may seem a little rustic and outdated, it is extremely effective. This is primarily because pathogens in the water tend to get attached to either particles or plankton. Zooplanktons called copepods are generally the ones that have pathogens attached to them. Straining the water through a cotton sari filter separates most cholera bacteria as well as other pathogens. This form of filtration has proved to be very effective in reducing cholera infections in remote villages where access to other water purification methods and fuel for boiling water are very hard to come by.

The sub-Saharan region in Africa is another area where a cloth filter such as this one proves to be very useful. Guinea worm dracunculiasis infections tend to be endemic, and using a nylon mesh that has a pore size of around 150 μm is an excellent way of sieving the copepods and the parasites that use them as hosts.


Rita Colwell and Anwar Huq from the University of Maryland Biotechnology Institute in conjunction with a group of researchers from Bangladesh did an extensive study on the cloth filter. They reported that this common practice of filtering water through a cotton cloth provides a smaller mesh size (approximately 20-μm). This is fine enough to strain most phytoplankton and all zooplankton resulting in water that is 99% cholera-free.
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