Technical Foundation
What Is a Dishes and Petri Dishe?
A petri dish is a shallow, flat-bottomed, lidded dish used to culture microorganisms, cells, or tissue on a solid growth medium such as agar, or to hold samples for visual or microscopic examination. Disposable polystyrene dishes, typically supplied pre-sterilized by gamma irradiation and sealed in sleeves, dominate routine microbiology and cell culture work because they eliminate the need for autoclaving between uses; glass dishes are chosen where chemical resistance, autoclavability, or optical clarity for certain applications outweighs the convenience of disposables.
Diameter (commonly 35mm, 60mm, 90mm, 100mm, and 150mm) is selected based on colony count needs and incubator space, while lid style — vented (with raised ridges or notches allowing gas exchange while limiting contamination) versus tight-fitting — affects CO2 exchange for cell culture incubation versus airtight containment for other sample types. Weighing dishes are a related but distinct format, shallow and disposable, used to hold a measured sample on a balance rather than to culture anything.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Diameter | Common sizes: 35mm, 60mm, 90mm, 100mm, 150mm | Sized to colony count needs, sample volume, and incubator/shelf space |
| Material | Polystyrene (disposable), borosilicate glass (reusable) | Polystyrene is pre-sterilized and disposable; glass is autoclavable and chemically resistant |
| Sterility | Sterile (gamma-irradiated, sealed) vs. non-sterile | Sterile dishes are required for microbiology and cell culture work to prevent contamination |
| Lid Style | Vented (gas-exchange notches) vs. tight-fitting | Vented lids allow CO2 exchange needed for many cell culture incubation protocols |
| Treatment | Tissue-culture treated vs. untreated polystyrene | TC-treated surfaces are chemically modified to promote cell adhesion for culture work |
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Applications
Where Dishes and Petri Dishes Get Used
Petri and lab dishes are specified anywhere a sample needs to be cultured, incubated, weighed, or visually examined in an open, shallow, lidded container.
Microbiology Labs
Culturing bacteria, fungi, and other microorganisms on agar media for identification and research.
Cell Culture & Biotech Research
Growing mammalian cell lines in tissue-culture-treated dishes under controlled CO2 incubation.
Clinical & Diagnostic Labs
Culturing patient samples for pathogen identification and antibiotic susceptibility testing.
Food & Environmental Testing
Culturing samples from food, water, and environmental swabs to test for microbial contamination.
Pharmaceutical Quality Control
Environmental monitoring and sterility testing during pharmaceutical manufacturing.
Educational & Teaching Labs
General-purpose petri dishes used in academic biology and microbiology coursework.
FAQ
Dishes and Petri Dishes Questions, Answered
Should I use disposable polystyrene or reusable glass petri dishes?
Disposable polystyrene dishes come pre-sterilized and eliminate autoclaving between uses, making them the standard choice for routine microbiology and cell culture where contamination control and throughput matter most. Glass dishes are chosen when chemical resistance to solvents, autoclavability, or specific optical properties are needed that polystyrene can't provide.
What does 'tissue-culture treated' mean on a petri dish?
TC-treated polystyrene has had its surface chemically modified (typically via plasma or corona treatment) to make it hydrophilic and promote cell attachment and spreading, which untreated polystyrene does not support well. Standard untreated dishes are used for microbiology on agar media, where cell adhesion to the plastic surface isn't the point.
Why do some petri dish lids have vents or notches and others don't?
Vented lids have raised ridges or notches that allow gas exchange — important for cell culture incubation where CO2 needs to reach the medium to maintain proper pH — while still limiting airborne contamination more than a fully open dish. Tight-fitting, non-vented lids are used where airtight containment matters more than gas exchange.
What size petri dish should I use for a standard microbiology culture?
90mm and 100mm dishes are the most common sizes for routine bacterial and fungal culture work, offering enough surface area for colony counting and isolation streaking. Smaller 35mm and 60mm dishes are used for cell culture work needing less surface area or higher-density incubator loading; 150mm dishes are used when higher colony yield or surface area is needed.
What's the difference between a petri dish and a weighing dish?
A petri dish is designed to culture organisms or hold samples with a lid for containment, typically round with matching upper and lower halves. A weighing dish is a shallow, open or minimally-lidded disposable tray specifically shaped and sized to sit on an analytical or precision balance for measuring out a sample by weight — it isn't intended for culturing anything.
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