Filter Paper for Air Sampling by Air Samplers, Air Sampling Systems, Air Pollution Sampling Instrumentation, Air Flow Calibrators, Air Flow Calibration Services, ANSI N13.1-1999, Annular Kinetic Impactors, Continuous Emissions Monitoring Systems (CEMS), Particulate Sampling Systems, PUF, Polyurethane Foam Samplers, Radio iodine Sampling Systems, Shrouded Probe, Stack Sampling Systems, Silver Impregnated Zeolite Cartridges, TEDA Impregnated Carbon Cartridges

Filter Paper for Air Sampling [Page33] shipping weight: 2 LB

Glass Fiber,Ashless Cellulose,& Carbon Impregnated Filter Paper

General Information:Environmental air sampling uses two major categories of filter paper media,Cellulose and Glass fiber.Carbon Impregnated filter paper is occasionally called out for in the determination of the presence of airborne Iodine.

Glass Fiber Filter Media
Glass fiber filter media is made from 100%microfine borosilicate glass fibers.Glass fiber filters are used where high flow rate and micron/sub-micron filtration is required. The filter media can be used for both liquid and air filtration. In the highest purity form,HI-Q offers a binderless “AE ” grade glass filter media.With its ’ excellent purity,,using the FPAE series filter paper reduces the overall possibility of extractable organics commonly found in cellulose filter paper.Where greater structural strength filter papers are needed (high pressure drop, vacuum applications),either a spun polyester backing is used,Type FP5211 ,or a minimal amount of acrylic resin binder is used,Type FP2063 &FP2061 ,to keep up the integrity of the glass fibers during and after sampling/analysis.Some PM-10 sampling applications specifically call out for Whatman ’s “EPM-2000 ”,HI-Q part number FP2000 .FP2000 was developed and produced especially for use in high volume PM-10 air sampling equipment that collects atmospheric particulates and aerosols.

Properties of Glass Fiber Media:The borosilicate glass fibers are inert and resistant to all but strongly alkaline bases or acids such as hydrofluoric acid.The fibers are heat resistant and will only begin to soften at over 600 °C.The borosilicate glass has a refractive index of 1.51,and when immersed in a solvent of a similar refractive index like benzene,the fibers will be transparent.Particles collected on the media then become easier to visibly identify.NOTE:BENZENE HAS BEEN DETERMINED TO BE A TOXIC SUBSTANCE.

Particle Retention:For air and gas filtration,collection of sub-micron (less than one micrometer in aerodynamic diameter)particles is sometimes required.In nuclear environmental air testing,the protocol is for sub-micron collection.Use of glass fiber media is therefore recommended.The test procedure for determining the effectiveness of particle retention is known as the DOP smoke test.In this test,DOP (di octyl phthalate)is heated,the vaporized compound is dispersed into theair where it is cools and condenses into mono-molecular particles of 0.3 micron size.By drawing these airborne particles through the filter media and measuring the amount of breakthrough particle,a retention efficiency is established.See tabular results in “General Performance Summary on Glass Fiber Paper ”.NOTE:DOP HAS BEEN DETERMINED TO BE A CARCINOGEN.

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