Microppose Petri Dishes 90mm x 15mm Plates | Vented Lid | Polystyrene Sterile |500-Pack
Microppose Petri Dishes 90mm x 15mm Plates | Vented Lid | Polystyrene Sterile |500-Pack - 1 Case is backordered and will ship as soon as it is back in stock.
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Microppose Petri Dishes 90mm x 15mm Plates | Vented Lid | Polystyre...
Description
Description
Microppose Sterile Petri Dishes — bulk 500-pack case of premium 90mm x 15mm polystyrene plates for commercial mycology, university labs, classrooms, and research facilities. Each case contains 25 individual sleeves of 20 plates, factory pre-sterilized and packed for efficient inventory handling. Open one sleeve at a time as you need them; the remaining 24 sleeves stay sealed and sterile until use.
Buying the 500-pack case delivers substantially lower cost per plate than purchasing twenty-five individual 20-pack sleeves separately. Add our LME Agar Powder Blend and the total cost per finished poured plate works out to a small fraction of the $3–$5 retail price of pre-poured commercial agar plates.
Who Buys the 500-Pack Case?
This is the case quantity preferred by serious commercial and institutional buyers who run agar work at scale:
- Commercial mushroom farms running cloning, isolation, and genetic library work on multiple species
- University and college biology / microbiology programs stocking lab supplies for full-semester courses
- High school science classrooms for AP Biology, microbiology, and dual-enrollment lab courses
- Cannabis tissue culture facilities running large-scale clean propagation and genetic preservation
- Research laboratories in mycology, plant pathology, or microbiology requiring consistent supply
- Commercial culture producers pouring large batches of agar for resale or supplemental product lines
- Mycology cooperatives and educational organizations sharing supplies across multiple growers
For occasional or hobby-scale agar work, the 20-pack sleeve is more cost-effective. The 500-pack starts making sense when you'll use through it within 12 months.
Why Microppose for Bulk Lab Supply
For commercial and institutional buyers, the choice of supplier matters more than for hobbyists — supply consistency, dish-to-dish uniformity, and machine compatibility directly affect lab productivity. Microppose engineers their dishes specifically for high-volume professional use:
- Optical-grade polystyrene for the clearest possible visibility of cultures, samples, and growth patterns — important for photo documentation, student observation, and quality control work
- 16 grams per dish — 25% heavier than typical disposable plates, delivering better stack stability when storing hundreds of plates and reduced flex during transfer work
- Triple-vented lid design for balanced gas exchange — reduces condensation buildup during incubation while maintaining a sterile barrier against airborne contaminants
- Flat-bottom design ensures even agar distribution when pouring — critical for production batches where uniform medium depth affects yield consistency
- Machine-stackable smooth surfaces — designed for automated plate handling equipment used in commercial production and research labs
- Sleeve packaging (25 × 20) — open one sleeve at a time to maintain sterility on unused portions; ideal for graduated supply use over weeks or months
Microppose products are designed in the USA and manufactured by one of the world's largest labware producers, combining global manufacturing scale with quality control standards used by professional laboratories.
What's in the Case
- 500 sterile 90mm x 15mm petri dishes in 25 sleeves of 20
- Optical-grade polystyrene single-use construction (NOT autoclavable)
- 16 grams per dish — 25% thicker than standard disposable plates
- Triple-vented precision-fit lids
- Flat-bottom design for even agar distribution
- Factory pre-sterilized — each sleeve sealed sterile until opened
- Machine-stackable smooth surfaces compatible with automated handling equipment
- Boxed for safe shipment — case ships in a protective outer container
- Brand: Microppose
Pallet Quantities & Wholesale Pricing
For institutional buyers, commercial production facilities, and high-volume operations needing more than one case, we offer pallet quantities with freight shipping included. Pallet orders deliver the lowest possible cost per plate and ship directly from our distribution facility. Common use cases:
- University system supply contracts (multi-campus, multi-semester)
- Commercial mycology operations producing fresh agar plates for sale
- Cannabis cultivation operations running large-scale tissue culture programs
- Research consortia and shared institutional labs
Contact us for pallet pricing, freight quotes, and volume discounts. We can also accommodate purchase orders and net-30 terms for qualified institutional buyers.
How to Use
Each sleeve of 20 plates is sealed and sterile until opened. For high-volume workflows:
- Open one sleeve at a time under your laminar flow hood or clean workstation. The remaining 24 sleeves stay sealed and sterile in the case.
- Prepare your agar separately in autoclave-safe containers. For mushroom work, our Myco Labs LME Agar Powder Blend is the recommended formulation — one 200g bag makes 200+ plates, so a 500-pack case pairs with roughly 2.5 bags of LME powder for a complete pour cycle.
- Pour — fill each dish about 1/3 full (roughly 18–20ml) with cooled sterilized agar (120–140°F / 50–60°C).
- Set and store — allow plates to solidify with lids slightly cracked. Once solid, stack upside-down (lid on bottom) to prevent condensation drips.
- Refrigerate poured plates if not using immediately — sealed plates at 35–40°F stay viable for 30 days. Bring to room temp before inoculation.
- Dispose after use — these are single-use plates and cannot be autoclaved. For reusable plates suitable for repeated sterilization cycles, see our Reusable Polypropylene 500-Pack Case.
Specifications
| Case contents | 500 dishes — 25 sleeves of 20 each |
| Dish dimensions | 90mm diameter × 15mm height |
| Weight per dish | 16 grams (25% heavier than standard disposables) |
| Material | Optical-grade polystyrene plastic (NOT autoclavable) |
| Use type | Single-use disposable — sterile from factory |
| Lid design | Triple-vented for balanced airflow |
| Bottom design | Flat-bottom for even agar distribution |
| Sterility | Factory pre-sterilized via gamma irradiation, sealed sleeves |
| Machine compatibility | Smooth surfaces compatible with automated plate handlers |
| Wholesale availability | Pallet quantities with freight shipping included |
| Brand | Microppose |
Disposable vs. Reusable — Case Quantity Comparison
We carry both disposable and reusable formats in case quantities. Quick guide to which makes sense:
| Choose Disposable 500-Pack Case (this product) | Choose Reusable Polypropylene 500-Pack Case |
| Classroom or instructional lab use | Long-term research lab with established sterilization protocols |
| Commercial production where speed matters more than per-cycle cost | Commercial production prioritizing minimum long-term per-plate cost |
| Settings where used plates can't be safely autoclaved on-site | Facilities with autoclave capacity that can absorb the sterilization workflow |
| Highest possible optical clarity for photography or documentation | Sustainability and waste reduction are explicit priorities |
Recommended Companion Products
- Myco Labs LME Agar Powder Blend — premium MEA formulation; one 200g bag pours 200+ plates. A 500-pack case pairs with 2–3 bags for a full pour cycle.
- Laminar Flow Hoods — for sterile pouring at production volumes (our Bonsai H14 HEPA hoods are USA-built in Illinois)
- Autoclaves & Pressure Cookers — commercial autoclaves available for high-volume agar sterilization
- Microppose Sterile Petri Dishes 20-Pack — smaller quantity for hobby or occasional use
- Microppose Reusable Petri Dishes 500-Pack Case — autoclavable polypropylene for repeat use
- Colonized Agar Plates — ready-to-use mushroom cultures for direct transfer to your fresh plates
- Agar Tools & Supplies — scalpels, parafilm, and other agar work accessories
Frequently Asked Questions
How is the case packaged?
The 500-pack case contains 25 individual sleeves of 20 plates each, packed in a protective outer carton for shipment. Each sleeve is independently sealed and sterilized — you open only the sleeves you need, while the remaining sleeves stay sealed and sterile in the case for future use. This allows you to graduate through the case over weeks or months without compromising sterility on the unused portion.
What's the cost savings vs. buying twenty-five 20-packs separately?
The 500-pack case is priced significantly below the equivalent of 25 individual 20-pack sleeves at retail. The case is the right choice when you'll work through it within 12 months — typical for university labs, classrooms, commercial mycology operations, and high-volume tissue culture facilities. For hobby cultivators using a few plates per month, the 20-pack remains the better-value purchase.
Do you offer pallet quantities?
Yes — pallet quantities are available with freight shipping included. Pallet orders deliver the lowest possible per-plate cost and ship directly from our distribution facility. We work with university procurement offices, commercial mycology operations, cannabis tissue culture facilities, and research consortia. Contact us for pallet pricing, freight quotes, and volume discount tiers. We also accommodate institutional purchase orders and net-30 terms for qualified buyers.
Can these be used with automated plate handling equipment?
Yes. The smooth, slippable top surface and consistent dimensions are specifically designed for automated stackers, dispensers, and handling robots used in commercial mycology production and research lab workflows. This is one of the design features that differentiates Microppose plates from cheaper bulk alternatives, where dimensional inconsistency can jam automated equipment.
How long do unopened sleeves stay sterile?
Indefinitely, as long as the individual sleeve seal remains intact. Microppose plates are factory-sterilized using gamma irradiation and sealed in nitrogen-flushed sleeves. Stored in a clean, dry place out of direct sunlight, unopened sleeves remain sterile for years. This is particularly valuable for case-quantity purchases where you might gradually work through the inventory over many months.
Are these reusable? Can I autoclave them?
No — these are single-use disposable polystyrene plates. Polystyrene melts and warps at autoclave temperatures (121°C / 250°F), so attempting to sterilize them in an autoclave will destroy them. For autoclavable plates that handle repeated sterilization cycles, we offer the Microppose Reusable Polypropylene 500-Pack Case in the same bulk format.
What kind of agar should I pair with these for a complete bulk workflow?
For mushroom cultivation, the standard is malt extract agar (MEA) — our Myco Labs LME Agar Powder Blend is a pre-mixed formulation where one 200g bag makes 200+ plates. To pour through a full 500-pack case, you'll need approximately 2.5 bags of LME powder. For non-mycology applications, potato dextrose agar (PDA), nutrient agar, or specialty media work equally well.
Can I order these on a purchase order for a university or institution?
Yes — we work with university procurement offices, school districts, research institutions, and corporate lab buyers. We accept purchase orders and net-30 terms for qualified institutional buyers. Contact us to set up an institutional account or discuss your specific procurement requirements.
How should I store unused sleeves between uses?
Keep unused sleeves in a clean, dry place at room temperature, ideally in the original case for protection. Avoid humidity, direct sunlight, and temperature extremes (don't store in garages or unheated spaces that go below 40°F or above 90°F). The factory-sealed sleeves are robust, but rough handling can compromise the sterile seal. Treat each sleeve like the sterile lab consumable it is until you're ready to open it.
Are these the same plates as the 20-pack listing?
Yes — identical product, just in case quantity instead of single-sleeve quantity. Same Microppose 90mm × 15mm optical-grade polystyrene dishes with triple-vented lids, factory pre-sterilized, 16g per dish. The 500-pack case is for high-volume users who would otherwise need to buy 25 individual 20-packs.
Let customers speak for us
I was getting alot of contam with northspore boomr bag strait garbage company. Contamination central at northspore almost everything contams. I tried a couple other companies then tried this blackcow. Its black gold Texas T the biggest dummy in the world will get massive flushes with this. The grain bags are awesome too and sterilized right. I went 14/14 on the grain bags. Midwest know what they are doing and even the packaging is next lvl everything double bagged. I only buy from midwest it's worth every cent
It's been several days since the Ecosphere arrived and I set it up, and I'm still amazed at all I got for the price: heater, fan, humidifier, two plug-in timers, two foil trays, and, of course, the five-tier tent with shelves and the plastic cover. Oh, and the LED light strip and the round air filters. It's everything I need right now, and I've started the growing process. It's a crazy good deal for the price. I'm new to mushroom growing, and I'm thrilled that I bought this setup as a start. Just plain wonderful.
Fast and easy colonization! These grain jars showed growth after just 10 days. My previous efforts with the all-in-one bags are taking MUCH longer but also working. Thank you Midwest Grow Kits 🙏
I love the people and the products. The people at MWGK clearly care about the integrity of the community they serve.
The monotub works amazing only had it a couple of weeks and about to have second harvest I used AIO grow bag for first flush and move to tub for second and its great not having to watch 24/7. Thanks Midwest
Four days after mixing grain, Select substrate, and the Midwest horse manure booster - the results speak for themselves.
It has everything you need for a fast, large flush success with fewer moving parts than a standard monotub. It is a surprisingly versatile option for more advanced students. Pic is 5 grain jar at 8 days. GT LM This is where I shop, now.
Rich, perfectly field-wet, sterile and it is perfect for those many varieties that won’t thrive quite as well in Bulk Substrate and Casing Mix, which I’ve seen as best for psilocybes/cyanescens. I’m using it for the first time with Lions Mane and King Trumpets. So far so good, 7 days and primordial and pins are starting to flourish. It drains better and is lighter than MGK’s Bulk Casing and Substrate. Great product.
Love the heater and how even and exact it heats. I set mine to 76 degrees and my room fluctuates from 64-75 and it holds solid at 75 degrees. I used a probe thermometer to double check the substrate level temp and its exactly 1 degree less than the heater setting. Another tip, I only needed to use the round monotub thermometer to check my humidity levels every so often. I would leave a filter disk on that hole instead of the thermometer. The only time it came in handy was after my first flush when humidity started to drop. I was able to use that gauge and check whether I needed to mist. Overall great kit and worth the money!
Ive bought mutiple jars before i came up with my own recipe, every jar produced healthy cultures, even if ones damaged in shipping they replace immediately, highly recommend
Very small chance that you get a contaminate you already had it and you’re either culture spores etc. their stuff is 100% sterile every time 100% of the time everything is viable never had a problem been shopping with them for sometime
It’s very good product and I highly recommend it to everyone.👏👏👏
I love my magnetic stir plate it works great for Liquid culture jars.
My bag had a slow start, but excellent finish. Oak Ridge.
Great product for my cannabis best deal around arrived fast thank you Midwest grow kits definitely will be purchasing again
