Plastic Petri Dishes – Sterile & Disposable

Applications of plastic Petri dishes

Plastic Petri dishes are the primary vessel for solid and semi-solid culture media in clinical microbiology, pharmaceutical quality control, food safety testing, and environmental monitoring. Their flat-bottomed, lidded design — first standardised by Julius Richard Petri — enables reproducible culture conditions across a wide range of agar-based and selective media.

In pharmaceutical manufacturing and clean room environments, RODAC contact plates (Ø65 mm with a convex agar surface) are specifically used for surface contamination monitoring — pressing the dish directly onto equipment or surfaces to capture airborne and contact microorganisms. For differential diagnostics requiring multiple culture zones on a single plate, partitioned Petri dishes with 2 or 3 sectors reduce material usage and allow side-by-side comparisons on one vessel.

Beyond microbiology, Petri dishes are used in cell culture, chemical crystallisation studies, microscopy sample preparation, and as shallow containment vessels for small components during assembly or inspection work.

How to choose the right Petri dish

The right dish format depends on three factors: the culture medium volume required, the type of analysis, and compatibility with your laboratory's equipment.

For most routine bacteriology and mycology work, Ø90 mm dishes with H=14.2 mm are the standard choice — they accommodate 15–20 ml of agar and fit virtually all benchtop incubators. If you work with fungi requiring deeper cultures, or need to reduce evaporation during extended incubation, Ø90 mm H=16.2 mm dishes provide additional depth without changing the footprint.

For surface monitoring in cleanrooms and pharmaceutical production areas, RODAC Ø65 mm dishes are the correct format — their slightly convex surface, when filled, enables direct contact sampling.

For screening work where multiple media types are tested per sample, partitioned dishes (2 or 3 sectors) reduce both material consumption and bench space. For automated colony counting or work requiring a full grid reference, square 120 × 120 mm dishes are the practical choice.

If you are unsure which format suits your application, contact our team — we can advise based on your specific workflow and equipment.

Sterile Petri dishes and microbiological safety

All Noex Labware sterile Petri dishes are gamma-irradiated and individually packaged in sealed bags. Sterility is production-validated for each batch, providing the microbiological assurance required in clinical diagnostics, pharmaceutical QC, and research applications where culture integrity is critical.

For laboratories performing their own media preparation and in-house sterilisation, our non-sterile (aseptic) dishes are available in bulk packaging, reducing per-unit cost without compromising dimensional consistency or material quality.