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  Home » Catalog » Particulate Samplers » Filters » Specialty Filters » Gelatin Filters

Gelatin Filters

Orderable Items Pre-sterilized, high-moisture Gelatin Filters help to maintain microorganism viability for sampling periods up to 30 minutes. Gelatin Filters dissolve easily when placed on agar and can be used to monitor in areas where disinfectants or antibiotics are present.

  • Absolute retention rate
    • 99.9995% for Bacillus subtilis var. niger spores*
    • 99.94% for T3 phages (coli phages)*
    • 99.9% T1 phages (coli phages)*

  • High moisture content
    • Maintain microbe viability for short sampling periods

  • Completely water soluble
    • Dissolve easily when placed on agar
    • Provides the solubility required for virus sampling

  • Pre-sterilized by gamma irradiation

  • Ideal for monitoring in pharmaceutical plants

  • Can be used to monitor in areas where disinfectants or antibiotics are present

  • *At inlet velocities of 0.25 m/s, 0.3 m/s (80% RH), and 0.3 m/s (50% RH), respectively





    Performance Profile

    Material Water-soluble gelatin
    Pore Size While having a nominal pore size of 3 µm, a higher capture efficiency of sub-micron particles can be expected due to the separations that occur on the surface and within the filter. It is through inertial impaction and diffusional interception that these filters can remove particles much smaller that 3 µm.
    Diameter 25 mm or 37 mm
    Thickness Approximately 250 µm
    Sterilization Presterilized by gamma radiation. Filters individually wrapped and packaged in units of five each in a polyethylene bag
    Thermal Resistance Maximum 140 F (60 C)
    Residual Dampness Content 46 to 49%
    Conditions for Use Maximum room temperature is 86 F (30 C); maximum relative humidity is 85%.
    Sampling Time 30 minutes at typical indoor relative humidity
    Sampling Flow Rate

    1 to 4 L/min for filter sampling of biological contaminants using a standard filter cassette, Button Sampler, or the IOM

    Storage Gelatin filters may be stored in low humidity, ambient conditions; storage between 39.2 and 46.4 F (4 and 8 C) is recommended.
    Caution: Do not store gelatin filters below 39.2 F (4 C). Condensation during thawing will dissolve filter. Avoid exposing filters to moisture, chemical vapors, and extreme temperatures.
    Shelf-life 3 years from date of manufacture
    Analysis Direct method or indirect method. Gelatin filters dissolve when placed on agar plates.





    The unique properties of Gelatin Filters provide unequalled bacteria retention levels for quantitative analysis. Sampling with gelatin filters is easy, efficient, and can provide information about relative changes in microorganism concentration throughout the day. While sampling microbes with traditional filter materials has been known to reduce culturability due to desiccation, the high moisture content of gelatin filters helps to maintain microorganism viability for sampling periods up to 30 minutes. Gelatin filters dissolve easily when placed on agar, allowing for a gentle transition from sample medium to growth medium. For maximum culturability and superior collection of inhalable-size bioaerosols, combine gelatin filters with the SKC Button Sampler. See below.

    About Using Gelatin Filters with the Button Sampler

    For maximum microorganism survivability and superior collection of inhalable-size bioaerosols, use sterile gelatin filters with the SKC Button Sampler. The Button Sampler features a unique inlet that contains evenly spaced holes that act as sampling orifices for multi-directional sampling. The proximity of the filter to the inlet minimizes transmission losses and provides equal distribution of particle loading and low intersample variation. Combining the Button Sampler with the nurturing properties of gelatin filters creates a sampler that is most efficient at collecting inhalable bioaerosols for viable or non-viable analysis.

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    A typical filter will have a rough side and a shiny side. The shiny side is easier to read under a microscope, therefore, expose the shiny side to the air for microscopic analysis. The rough side holds dust more effectively; expose the rough side for gravimetric analysis.

    Gelatin filters feature high moisture content, however, they are very brittle and break easily. Handle with care.