Petri Dishes, Plastic, 90 x 15mm, Box of 500

These 90 x 15mm plastic Petri dishes come in a box of 500, with a choice of a 3 vent lid or a no vent lid. The vented lid allows gas exchange for aerobic cultures, while the no vent lid suits sealed storage.

They're made for single use in microbiology and general lab work. Choose the vented version for standard culturing, or the no vent version when you need a tighter seal.

Product Specifications

• Size: 90mm diameter x 15mm height, the standard format used across microbiology laboratories.
• Material: Crystal-grade polystyrene (PS).
• Optical clarity: Clear enough for easy colony counting and direct inspection under a microscope without opening the lid.
• Thermal limit: Stays stable up to roughly 55°C. Being polystyrene, these dishes are single-use only and can't be autoclaved, as the plastic melts at sterilisation temperatures.
• Surface treatment: Uncoated and hydrophobic. They aren't tissue-culture treated, so they suit microbial (bacterial and fungal) growth rather than mammalian cell adhesion.
• Agar volume: Holds a working volume of 15 to 25ml of culture media comfortably.
• Sterility: EO (ethylene oxide) sterilised, valid until the expiry date printed on the pack.
• Sterile barrier: The inner plastic sleeves hold 10 dishes per bag and keep contaminants out until you open the pack.
• Certifications: CE and ISO 13485:2016 quality management standards for medical and laboratory devices.
• Lid type: 3 vent or no vent (choose from the options).
• Traceability: Each sterilisation run is linked to the lot number stamped on the outer carton and the inner pack label, so laboratories can trace quality control certificates.
• Product of China

Vented vs Non-Vented Lids

The vented lid has small raised plastic ridges (usually 1, 3 or 4 vents) moulded into its underside. These lift the lid slightly off the base, leaving an even gap that lets air and gas move while keeping the inside safe from contaminants in the room.

The non-vented (no vent) lid sits flush on the base with no ridges, creating a near-airtight seal. This cuts evaporation, holds in moisture and gives good protection against outside contamination during long incubations.

Why Choose the Vented Option?

• Less condensation: Moisture escapes instead of pooling on the lid, so water droplets don't fall back onto the agar and smear your colonies.
• Better aerobic growth: A steady supply of fresh oxygen helps strict aerobic organisms grow at their best rate.
• Faster cooling after pouring: When you pour hot agar, steam escapes straight away, so the plates cool faster and cleaner.