In designing or selecting a filter system using micro porous media, some time must be spent to determine the filter media needed for particular application. For example,
Will you be filtering liquid or gas?
What is the size of the smallest particle that must be removed?
What type of filter holder you are going to use?
What type of force you will use- pressure or vacuum?
In general a pore size just smaller than the smallest particle size to be removed is chosen. For liquids, micro glass fiber, cellulose nitrate or nylon membrane can be used. For filtering gases or sterile venting of tanks, always choose a hydrophobic membrane like Teflon.
In laboratory filtration process, volumes are generally small & hence more convenient vacuum holders are used for liquid and general purpose holders are used for gas filtration. These are available with Systems & Services.
For liquid filtration a convenient membrane filter size is 47 mm which is an international standard. Same size membrane can be used for gas filtration as well.
Systems & Services filter media are available in standard pore sizes and diameters as per table given below:
Will you be filtering liquid or gas?