Filter Paper For Air Sampling and Other Uses

Glass Fiber Filter Paper Grade FPXM is made from 100% high quality borosilicate glass micro fibers. It is designed to be used as a general purpose filtration media. Many glass fiber filter paper grades are used for air sampling.  FPXM is an excellent all around analytical grade filtration media for use in removal of micron and submicron size particulates from both liquids and gases. This glass fiber filter possesses less than 5% acrylic binder and typically is of excellent purity. This purity makes FPXM very useful in reducing the number of possible variables which are frequently introduces into experimentation from trace levels of extractable organics inherent in cellulose filter paper.

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Particle Retention

For air or gas filtration FPXM has a DOP efficiency of 98% when measured at a flow velocity of 32 liters per minute, through a 100 square centimeter area, with a particle concentration of 100 micrograms per liter of air. DOP (dioctyl phthalate) particles used in such determinations have an average size of 0.3 microns.

Liquid filtration particle retention values are highly dependent of numerous factors which affect a depth filter's ability to capture and hold particulates. These factors include the physical shape of the particles, viscosity of the solution, flow velocity and others.

Although gauging particle retention values for liquid filtration are not as definitive as for air filtration, it is estimated that FPXM retains particles in the 1 to 2 micron range with very high efficiency.

High Flow Rate

The non-fibrillated structure of the glass microfibers used in FPXM allow very rapid flow rates to be achieved, without the loss of collection efficiency for small particles. Use of low vacuum makes it possible to achieve flow rates equal to or faster than cellulose filters having far lower retention efficiency in the one to two micron range for liquid filtration. The exceptionally high flow rates able to be achieved with glass fiber filters makes FPXM ideal for procedures which require low back pressure while collecting particles as small as a few tenths of a micron in air or gas filtration.

High Loading Capacity

Load capacity is a measure of a filter's ability to collect particulate without clogging or cessation of flow. The geometrical configuration of the glass microfibers and their formation into paper form in FPXM permits very high loading capacity. Collection of virtually of all types of particulate can be increased by using FPXM in place of conventional cellulose paper filters.
This is particularly useful when working with samples containing very high concentrations of particulates.

Chemical and Physical Inertness

FPXM, made from 100% borosilicate glass microfibers, is highly inert and resistant to chemical reaction. This property makes FPXM ideal for those analytical application which require exposure to acidic or alkaline solution. Only prolonged exposure to strongly alkaline solutions and certain strong acids, such as hydrofluoric acid, can cause weakening of the
filter structure and fibers.

High Temperature Resistance

Borosilicate glass is known for its high temperature resistance. Fibers used for manufacturing FPXM have a softening point of around 678 degrees Centigrade. It is recommended, however, that the filter not be exposed to temperatures in excess of 500 degrees Centigrade except for short periods; otherwise, damage to the structural integrity of the filter may occur. This high
temperature resistance makes FPXM ideal for analytical procedures where volatile or organic material must be removed by exposing the filter to a laboratory furnace. These filters are highly suitable and recommended for determination of suspended and volatile suspended solids in water analysis.

Transparency

FPXM is made from borosilicate glass, which has a refractive index of 1.5097, and can be made transparent by placing the filter into a liquid having a similar refractive index. Benzene generally produces excellent results in rendering FPXM transparent. This property is extremely useful in examining the various particles which become entrapped on and just below the filter surface, thus making visual identification of various precipitates, crystals, air and waterborne particulates possible.

Functional Specifications

Average Particle Retention Value

Dimensions Available

Circular Discs

Rectangular Sheets