HI-Q Environmental Products Company

- Glass Fiber, Ashless Cellulose & Carbon Impregnated Filter Paper

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Environmental air sampling for particulate generally use two major types of filter paper collection media, Glass fiber and Cellulose. Carbon Impregnated filter paper is called out for in the determination of the presence of airborne Iodine.

Glass fiber filter media is made from 100% micro-fine 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-XX 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 specially 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.

  • FP2063-XX - Hydrophobic, Glass Fiber Filter Paper with acrylic resin binder.
    This hydrophobic, high purity filter media is recommended for use in general purpose, high and low volume air sampling applications for particulate collection. It is composed of 100% high quality borosilicate glass microfibers and an acrylic resin binder. Both the FP2063-XX & FP2061-XX filter paper grades are excellent for the removal of micron and sub-micron size particulate from ambient air and stack gases. Because glass fibers are brittle and do not naturally bind together, a small amount of acrylic resin binder (composition of which is described in CFR Title 21, Part 177.2260, Filters, Resin Bonded. ASTM Spec) is used to retain the filter paper integrity during air sampling and routine handling. The total borosilicate glass microfiber composition found in the FP2063-XX & FP2061-XX filter media contains less than 5% acrylic resin binder. DOP Collection Efficiency 97%.
  • FP2061-XX - Hydrophilic, Glass Fiber Filter Paper with acrylic resin binder.
    This high purity filter paper has all the same properties of the type FP2063-XX, except that it is hydrophilic. Choose the paper best suited for your sampling application and particle identifying method. DOP Collection Efficiency 97%.
  • FPXM - Hydrophilic, Glass Fiber Filter Paper with acrylic resin binder.
    This hydrophilic high purity filter media is recommended for use in general purpose, high and low volume air sampling applications for particulate collection. It is composed of 100% high quality borosilicate glass microfibers and an acrylic resin binder. This media is highly inert and resistant to chemical reaction. This filter paper is excellent for the removal of micron and sub-micron size particulate from ambient air and stack gases. Because glass fibers are brittle and do not naturally bind together, a small amount of acrylic resin binder (composition of which is described in CFR Title 21, Part 177.2260, Filters, Resin Bonded. ASTM Spec) is used to retain the filter paper integrity during air sampling and routine handling. The total borosilicate glass microfiber composition found in the FPXM filter media contains less than 5% acrylic resin binder. DOP Collection Efficiency 97%.
  • FPX - Hydrophilic, Binderless, Glass Fiber Filter Paper.
    This 100% high quality borosilicate glass micro fiber material demonstrates excellent fine particle retention and has a high retention efficiency for filtration of large volumes of air (High loading capacity). This binderless glass fiber filter possesses excellent purity. It is ideally suited for suspended solids analysis. Temperature usage up to 550C. This media contains no acrylic binder. Low fiber shedding improves quality assurance of test results. DOP Collection Efficiency 99.98%, HEPA Quality.

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 (dioctyl phthalate) is heated, the vaporized compound is dispersed into the air 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 ASTM method D-2986 for the complete procedure.) See tabular results in 'Typical Performance Summary on Glass Fiber Filter Media'.

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