Specifying A Filter Bag
Step. 1 MATERIAL SELECTION
(choose the right filter media for your application)
You should choose the media from which your filters will be constructed based on the type of application they will be used for. Take the following things into consideration prior to selecting your media:
Temperature – do your bags need to withstand extreme temperatures
Product – what are you filtering
Chemistry – can your bags withstand the chemical make up of the dust particles
Resistance- is the filter media able to resist the wear and tear of the dust particles
Partical size-The micron distribution of the particulate being filtered
Choosing the correct filter media is an important and sometimes difficult process. To assist you in the identification of the right media for your bags, keep the following in mind:
Filter bag performance is directly related to how well it can tolerate the environment in which it is being used, how efficiently it can remove the dust particles and it’s ability to clean and renew.
We can help youi dentify the type of filter media currently used in your application. Below you will find a list of typical construction methods:
Woven felts
Non-woven felts
Natural fibers
Synthetics
Thermoplastics
Polypropylene (PPRO)
Polyphenylene sulfide (PPS)
Polyester (PE)
Thermoset
For additional information on media types please examine our sample chart
A simple test to determine if a material is a thermoplastic is to take a small swatch and put a flame to it. A thermoplastic material will begin to melt when exposed to direct heat.
The selection criterion eliminates materials based on temperature and chemical characteristics. The first cut is usually made based on temperature. Then the chemical characteristics of the gas stream are considered to further refine the search. Chemical Resistance. Next, the efficiency of the material further dictates the construction of the material i.e. – the weight – oz/sq. ft., fiber and surface treatments/membranes. Last but not least, if there are still two or more candidates it comes down to a price versus performance trade off.
