Filters > Polyester PTFE Coated Filter Bag, 0.5 Micron [PTFEP1S]
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0.5 Micron Polyester Filter Bag 0.5 Micron Polyester Filter Bag
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Item Description

These filter bags are made of a micron-rated felt, a non-woven fabric. Small polymer fibers of varying diameters and lengths are forced into a matrix. One side is singed, a process that further locks the filaments together on the "downstream" surface. This fabric does not produce an absolute filtration but rather a range based on generally accepted industry tests. Mandy factors influence the actual filtration including the shape, size, consistancy and loading of the contaminates. Also, the feed pressure and rate of flow affects the filtration results.
These felts have a far higher dirt capacity and flow rate than a flat woven type bag and is much more resistant to blinding (clogging). The material is meant to be disposable and does not clean as well as a woven material.

Polyester filter bags can be used for filtering any liquid. There is a handle strap which can be used for hanging them from a pipe or something similar for gravity filtration. They can also be pressurized by using a filter adapter head and a pump for faster and unattended filtering. Using a pump/adapter combo is highly recommended so you can get the longest life out of your bags and not have to wait around all day to filter when they are clogging.

General Introduction to Liquid Filtration

All filtration and screening involves limiting the passage of various sized solids by means of a barrier or fabric or media. This is done in two ways, by depth filtration using graded density material called felt or by surface filtration using filament woven material called mesh. Wovens, in turn have two basic varieties: multifilament and monofilament. In any application, variables such as flow volume, solids loading, shape and density of contaminants and other factors make this an inexact science. A general description of separation methods of media is helpful.


This is a filtration media made from a matrix of small fibers. One side is heat bonded to provide a uniform surface free of fiber loss. Contaminant particles are contained within the media by inpingment and entrapment. "Porosity" is defined by nominal micron ratings (1, 5,10,25,50,100,200) indacating the largest particle that can pass through, in general, and reflecting an increase in the density.

High Flow Rate
Cannot be cleaned
Low Cost
Inexact filtration
Easy disposal of solids in bag
Variable performance
High solids capacity


This is a filter media having a "Teflon" microporous membrane applied to a base of polyester felt. This results in a nonstick surface which allows for a contaminant "cake" to build and slough off or be removed by cleaning.

PTFE Coated Felt
Consistent filtration
High cost
Extended life
Lower flow rate
Sub-micron potential
Low solids capacity


This is a two-dimensional square-woven fabric used for light filtration and general purpose screening. Consistently woven using a given number of threads per inch, its filameents are comprised of small fibers, twisted into threads. It is generally made of polyester polymer. "Porosity" is defined in borad divisions of hole size, measured in microns (i.e. 100, 150, 250, 400, 600, 800)

PEMU (Polyester)
Low Cost
Moderate accuracy
low solids capacity
Can be used to prescreen
not as strong as NMO
Moderately Cleanable
blinding of hole


A two-dimensional square of woven mesh fabric used for lower solids or higher accuracy screening and classification of solids. Made from a smooth uniform, one piece extruded thread woven into a screen with high accuracy and consistency. Used for exact separation. "Porosity" is defined by a hole size in microns, with greater variety than multifilaments (i.e. 25, 50, 75, 100, 120, 150, 175, 200, 250, 300, 400, 500, 600, 800).


NMO (Nylon)
Very cleanable
High Cost
Low solid capacity


Max Temp
Chem Resistance


What bags should you be using? Use coarse bags for initial filtering. Do not jump right to the 1 micron. It's a waste of money. Start with at least 100 micron and work your way down as many steps as possible. bags can be stuffed inside of each other for multiple micron size passes in one filtering session. About 34 bags can be fit onto an adapter head to use with a pump. if done right, you will need more coarse bags than fine bags. 1 micron bags should rarely have to be changed while 50 and 100 micron bags will need to be changed many times collecting the bulk of the debris. Let the coarse bags do all the work for your final filtering bags.

When filtering WVO make sure the oil is at least 100 degrees so all fats are melted.

7" diameter bags are the best for graviry filtering and high volume while 4" bags are best for smaller applications and tight spaces.

See table below for specs on the possible material types for filter bags.

Compare Filter Bags
Filter Media Micron Range Advantages Disadvantages
Polyester 1-100 Filters Fats & Viscous Fluids Over-cleaning degrades filtering capabilities
Nylon 10-1000 Light Weight, Flexible Does not catch fats
Polypropylene 1-100 Filters Fats & Viscous Fluids, Chemical Resistivity (See Chart Below) Over-cleaning degrades filtering capabilities

Chemical Resistivities + Temp Ratings
Medias Mineral Acids Organic Acids Alkalies Oxidizing Acids Animal Vegetable Petro-Oils Organic Solvents Micro Organisms Temp Limits (F)


Good Good Good Good Excellent Excellent Excellent 275


Good Excellent Good Fair Excellent Good Excellent 200


Poor Fair Good Poor Excellent Excellent Excellent 300

This product is made in the USA.

0.5 Micron Polyester Filter Bag
Polyester PTFE Coated Filter Bag, 0.5 Micron
• Size#1, with hanging strap
• 16" Length, 7" Diameter
• PTFE Coated to 0.5 Micron Rating
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