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How to Choose Filter Cloth

Jul 23, 2020

The property and pattern of filter cloth will directly effect filtering result. So choosing filter cloth is a very important thing in the filter press work. Nowadays the filter cloth is made of synthetic fibers. According to materials there are polyester fiber, polyvinyl alcohol fiber, polypropylene fiber and polyamide fiber. Their properties are as followings:

Properties	Polyester	Polyamide	Polypropylene	Polyvinyl
Acid-resistant	Very good	not good	good	Bad
Alkali-resistant	not good	good	very good	very good
Conductibility	bad	better	good	Common
Breaking Stretch	30-40%	18-45%	>30%	12-25%
Recoverability	very good	>90% when 10% stretch	good	not good
Wearability	very good	very good	good	Better
Heat-resisting	170⁰C	130⁰C less contraction	90⁰C less contraction	100⁰C contraction
Softening-point	230-240⁰C	180⁰C	140-150⁰C	200⁰C
Melting Point	255-265⁰C	210-215⁰C	165-170⁰C	220⁰C

Note: The polyester can not resist strong sulphuric acid and heated formic acid. The polypropylene can not resist strong nitric acid, chlorosulfuric acid, strong caustic soda, strong acetic acid, acrylic acid and chloro-aromatic hydrocarbon.

Besides, for the better interception result and filter press filter speed, choose filter cloth according to the granularity, density, viscosity, chemical composition and filtering technology conditions. Due to variety of filter cloth material and pattern, there are different strength, extension percentage, penetration and thickness of filter cloth, and thus the different filtering efficiency. In addition, the cotton cloth, adhesive-bonded fabric, mesh screen, filter paper and porous membrane also may be used for filtering medium. If you need any consultation service please contact NX filter press supplier.