Most plates are packaged in sleeves of 10 (with some exceptions). All plates are packaged in the inverted position to prevent moisture from contacting the surface of the medium.

The petri dishes are designed to have interlocking rings on the lid and bottom; thus allowing the plates to be stacked one upon the other, while minimizing the danger of the plates slipping and falling.

The package material is permeable to water to allow the escape of excess moisture. Each bag is closed with a heat seal (the bags should be resealed by rolling the top of the bag down and using masking tape or cellophane tape in order to prevent drying of the media).

The plates are either 60, 100, or 150mm in diameter. Standard petri dishes are 15mm in height. SpaceSaver™ plates are 10mm in height (100mm monoplates only). The "Deep Dish" mycology plates are 25mm in height. Configurations available are: monoplates, biplates, and quadplates containing one, two, and four compartments respectively.


Most tubes are packaged in boxes of either 20 or trays of 100 (with some exceptions). These boxes can be converted into a convenient dispenser by tearing off the perforated top flaps. The glass is type 1 borosilicate with a low alkaline residue or polycarbonate tubes to ensure proper pH of the media. The screw-caps are polypropylene with inner rings for a tight seal. Tubes are available in five sizes: 13x100mm, 16x100mm, 16x125mm, 20x125mm, and 20x150mm. Each tube is labeled with a plastic label that can be written on by the user for specimen identification.


Flask are packaged in boxes of 20. Most bottles are packaged in quantities ranging from boxes of 10 to boxes of 24. The flasks/bottles are used for mycology and mycobacteriology. Media in the flasks is prepared in either a slanted or flat configuration. The bottled agar media is prepared in a deep configuration. Media that is transparent is labeled on the side of the flask or bottle for ease of viewing from the front or back sides.


Condensation may cause fogging of the upper surface of the flask, which may obstruct your view of the culture.

Rapid cooling after incubation causes condensation of the upper surface of the flask. Condensation in the flasks can be prevented by:

1. Inverting the flask during incubation and examining the cultures immediately after removing them from the incubator before any fogging occurs.

2. Keeping an uninoculated flask on top and below your incubating cultures. These insulating "dummy flasks" help to slow down the cooling process.

3. If condensation has already formed, it can be removed by tapping the flask on the counter top or by inserting a sterile cotton swab into the flask and wiping the inner surface from side to side.

Remember: For air exchange, incubate the flasks with loose caps (except Transgrow, Cat. no. X52).

Refer to the Hardy Diagnostics Catalog for a complete description of the over 2,000 types of media products that are manufactured.