F&J - Model FP-X -Glass Fiber Filter Paper

PARTICLE RETENTION

For air or gas filtration FP-X has a DOP efficiency of 99.98% when measured at a flow velocity of 32 liters per minute, through a 100 cm2 area, with a particle concentration of 100 micrograms per liter of air. DOP (dioctylphthalate) particles used in such determinations have an average size of 0.3 microns.

Liquid filtration particle retention values are highly dependent on numerous factors, which affect a depth filter’s ability to capture and hold particulate. These factors include 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 FP-X retains particles in the 0.75 to 1.5-micron range with very high efficiency.

HIGH FLOW RATE

The non-fibrillated structure of the glass microfibers used in FP-X allows 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 ranges for liquid filtration. The exceptionally high flow rates able to be achieved with glass fiber filters makes FP-X 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 from in FP-X permits very high loading capacity. Using FP-X in place of conventional cellulose paper filters can increase collection of virtually all types of particulate. This is particularly useful when working with samples containing very high concentrations of particulates.

CHEMICAL AND PHYSICAL INERTNESS

FP-X, made from 100% borosilicate glass microfibers, is highly inert and resistant to chemical reaction. This property makes FP-X ideal for those analytical applications which require exposure to acidic or alkaline solutions. 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 FP-X have a softening point of around 678ºC. However, it is recommended that the filter not be exposed to temperature in excess of 500ºC except for short periods; otherwise, damage to the structural integrity of the filter may occur. This high temperature resistance makes FP-X 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

FP-X 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 FP-X 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 water borne particulates possible.

• Fiber TypeL: 100% Borosilicate Glass Microfiber
• Basis Weight: 39 lb. per 500each 24” × 36” sheets
• Color: White
• Thickness: 0.014 inches
• Binder: None
• Surface Texture: Smooth
• Dry Tensile: 300+ Grams per inch width
• Wet Tensile: 500+ Grams per inch width