Indicator Organism Testing

3M™ Petrifilm™ Plates: time-saving, sample-ready plates uniquely designed to offer you increased productivity, reliability and a reduction in operational costs versus traditional methods of bacteria testing.

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Precise, consistent results.
More than 200 certificates, recognitions, validations and peer-review publications.


3M™ Petrifilm™ Plate are recognized by all the major regulatory agencies worldwide, including AOAC and the Canadian Compendium of methods

Compared to the variability associated with agar preparation, 3M’s standardized formula improves consistency across technicians, shifts and plants — worldwide.


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Maximize productivity

Plates are sample-ready, eliminating the time-consuming, cumbersome step of preparing agar dishes. Plus, plates such as the E.coli/Coliform Count and Staph Express Count plates go even further by eliminating the need for a subsequent confirmation step required with traditional agar methods. In a study conducted with 292 food-processing plants, companies increased their QA personnel efficiency by an average of 80.5%, saving an average of 3.7 hours per day of technician time by using 3M™ Petrifilm™ Plates.


Improve consistency

Compared to the variability associated with agar preparation, 3M’s standardized formula improves consistency across technicians, shifts and plants — worldwide. Each lot of 3M™ Petrifilm™ Plates goes through rigorous quality testing at our ISO 9001 certified manufacturing facility. This reduces the need for lot qualifications in operations making their own agar. More than 200 evaluations from peer-review publications and validating agencies worldwide have confirmed the consistent results of 3M™ Petrifilm™ Plates.


Easy to use

The simplicity and ease of use of 3M™ Petrifilm™ Plates make it easy to train technicians. Now they can learn — and succeed — starting with their very first test.


Space saving

Space is at a premium in the laboratory environment. That’s why 3M™ Petrifilm™ Plates are designed to be as compact and efficient as possible. The shelf-stable, thin design takes up 85% less space than agar dishes, freeing incubator and storage space and significantly reducing biohazardous waste.


History of 3M™ Petrifilm™ Plates


How does it work?




0 3M™ Petrifilm™ Aerobic Count Plates are sample-ready to use and help determine aerobic bacteria populations in testing processes. The indicator dye and built in grid allows for fast accurate identificaiton of colonies, within 48 hours.

A survey of 274 plants who converted to 3M™ Petrifilm™ Plates from traditional agar methods found an average labor savings of 45% and an average increased technician efficiency of 80%.

Our full line of easy-to-use 3M™ Petrifilm™ Plates can provide you with many benefits over traditional methods.


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0 The 3M™ Petrifilm™ E.coli/Coliform Count Plate identifies both E. coli and other coliforms with confirmed results in just 24-48 hours.
The 3M™ Petrifilm™ E.coli/Coliform Count Plate provides a confirmed result in 24 to 48 hours. By eliminating the confirmation steps you increase productivity and reduce overall lab costs. Fast, Accurate, Results in either 24 or 48 hours with three easy steps:

1) Inoculate - 3M™ Petrifilm™ Plates are easy to inoculate. Lift the top film and add sample
2) Incubate - The space saving design maximizes incubator space and
3) Enumerate - Confirmed coliforms are red and blue colonies with associated gas bubbles. Confirmed E.coli coliforms are blue colonies with associated gas bubbles. This 3M™ Petrifilm™ Plate can also be read in 4 seconds using the 3M™ Petrifilm™ Plate Reader.


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0 3M™ Petrifilm™ Coliform Count Plate, in as few as 22 hours, identifies coliform levels in raw materials, in-process/finished product, and plant environment/equipment.

The 3M™ Petrifilm™ Coliform Count plate results in 24 hours providing an indication of sanitation or processing issues. Fast, Accurate, Results in as few as 22 hours with three easy steps:
1) Inoculate - 3M™ Petrifilm™ Plates are easy to inoculate. Lift the top film and add sample
2) Incubate - The space saving design maximizes incubator space and
3) Enumerate - Confirmed coliforms are red colonies which are associated with gas bubbles. This 3M Petrifilm Plate can also be read in 4 seconds using the 3M™ Petrifilm™ Plate Reader.


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0 The 3M™ Petrifilm™ Enterobacteriaceae Count Plate enumerates coliforms plus potential pathogens and identifies contamination in the environment and food samples in as few as 22 hours.

The 3M™ Petrifilm™ Enterobacteriaceae Count Plates are an effective method to assess environments such as post-process food contact surfaces, and help you quickly determine potential sources of contamination. This plate enumerates all coliforms as well as potential pathogens such as Salmonella, Shigella and Yersinia. Fast, Accurate, Results in as few as 22 hours with three easy steps:

1) Inoculate - 3M™ Petrifilm™ Plates are easy to inoculate. Lift the top film and add sample
2) Incubate - The space saving design maximizes incubator space and
3) Enumerate - Distinctive colonies appear in as few as 22 hours. A built in grid makes counting colonies fast and easy.


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0 The 3M™ Petrifilm™ Staph Express Count Plate provides confirmed Staphylococcus aureus results in as few as 22 hours. 3M™ Petrifilm™ Staph Express Count Plates streamline your staph testing by providing fast confirmed results in a few steps. Distinctive red-violet colonies make intepretation very easy. Fast, Accurate, Results in as few as 22 hours with three easy steps:

1) Inoculate - 3M™ Petrifilm™ Plates are easy to inoculate. Lift the top film and add sample
2) Incubate - The space saving design maximizes incubator space and
3) Enumerate - Distinctive red-violet colonies appear in as few as 22 hours. A built in grid makes counting colonies fast and easy.

If you encounter high background flora in your staph testing, the 3M™ Petrifilm™ Staph Express Disk can be used to identify S. aureus from all suspect colonies.


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0 3M™ Petrifilm™ Aqua Plates are sample-ready plates that replace conventional agar, petri dishes, media pads and disposable filter funnels used in the microbial testing of water. Each plate contains a water-soluble gelling agent, nutrients and indicators in a dry, shelf-stable format.
We off four 3M™ Petrifilm™ Aqua Plates to cover your unique testing needs:

  • Heterotrophic Count
  • Coliform Count
  • Enterobacteriaceae Count
  • Yeast and Mold Count

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    0 The 3M™ Petrifilm™ Yeast and Mold Count Plate can differentiate and enumerate yeast and mold in 3-5 days.

    The 3M™ Petrifilm™ Yeast & Mold Count Plate identifies food borne yeast and mold in your food products and in your food processing environment. Yeast are easily differentiated from molds on the plate. Fast, Accurate, Results in 3-5 days with three easy steps:

    1) Inoculate - 3M™ Petrifilm™ Plates are easy to inoculate. Lift the top film and add sample
    2) Incubate - The space saving design maximizes incubator space and
    3) Enumerate - Yeast are typically indicated by small, blue-green colonies with defined edges and no foci. Molds are indicated by large, variably-colored colonies with diffuse edges and center foci. A built in grid facilitates counting colonies, giving you fast, precise and accurate results.


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    0 3M™ Petrifilm™ Environmental Listeria Plates,an AOAC®-RI method [Certificate # 030601], which can detect the presence of indicator Listeria and provides quantitative results of Listeria species from environmental samples in only 29±2 hours with no enrichment step required.

    A sample-ready culture medium containing selective agents, nutrients, a cold water-soluble gelling agent and a chromogenic indicator that facilitates the detection of the majority of environmental Listeria. Designed to analyze environmental samples and help increase the efficiency of monitoring plant sanitation.


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    3M and Petrifilm are trademarks of 3M. Used under license in Canada