Gelatin Filters, Sterile

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Part Number: 225-9551

Gelatin Filters, Sterile Overview

Presterilized gelatin (water soluble) filter, 25 mm, no support pad included, recommended for use with Button Sampler, pk/50

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.


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.
  • Filter Type : Membrane
  • Filter Material : Gelatin
  • Filter Diameter : 25 mm
  • Filter Cassette Material : Filter Only
  • Filter Support : No
  • Preweighed : No
  • Matched-weight : No
  • Autoclavable : No

The unique properties of Gelatin Filters provide unequalled bacteria retentionlevels for quantitative analysis. Sampling with gelatin filters is easy, efficient,and can provide information about relative changes in microorganism concentrationthroughout the day. Whilesampling microbes with traditional filter materials has been known to reduceculturability due to desiccation, the high moisture content of gelatin filtershelps to maintain microorganism viability for sampling periods up to 30 minutes.Gelatin filters dissolve easily when placed on agar, allowing for a gentle transitionfrom sample medium to growth medium. For maximum culturability and superior collectionof inhalable-size bioaerosols, combine gelatin filters with the SKC Button Sampler. Seebelow.

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.