Microppose Reusable Autoclavable Petri Dishes – 90mm x 15mm (20-Pack Sleeve)

These are high-temp polypropylene plastic, not glass. Polypropylene is the standard material for autoclavable reusable petri dishes because it handles repeated sterilization cycles without the breakage risk of glass and at a fraction of the cost. The plates are crystal-clear for excellent visibility of mycelium growth. If you're looking for borosilicate glass dishes, those are available as a different specialty product, but for the vast majority of mycology, lab, and classroom applications, polypropylene is the superior choice in terms of cost, durability, and safety.

With proper cleaning and handling, each dish can typically handle 20+ autoclave cycles before showing signs of wear. The thicker 17-gram construction is specifically designed for repeated thermal cycling. Signs that a dish needs to be retired include: visible cloudiness, deep scratches that obscure visibility, warping, or cracks. Treated well, a single 20-pack sleeve can serve a typical home cultivator for years.

Standard mushroom cultivation autoclave settings work perfectly: 121°C / 250°F at 15 psi for 30–45 minutes. The dishes are rated for this standard cycle indefinitely. Some users wrap dishes in autoclave-safe wrap or stack them in a Unicorn bag (such as the 10T bag used for spawn bags) for batch sterilization. Avoid dry heat sterilization above 121°C, which can warp polypropylene over time.

After culture work, scrape any remaining agar into compost or trash (don't pour agar down the drain — it can clog plumbing). Wash dishes with warm soapy water and a soft sponge — avoid abrasive scrubbers that scratch the surface and reduce clarity. Rinse thoroughly to remove all soap residue. Allow to air dry, then re-sterilize via autoclave before next use. A dishwasher works for cleaning if your dishwasher reaches sanitizing temperatures, but autoclave sterilization is still required before reusing for sterile culture work.

Three reasons: cost, quality, and waste. Cost: The break-even point versus single-use plates is typically reached after just 4–5 reuse cycles. After that, every cycle is essentially free. Quality: The thicker 17-gram construction is far more durable than the thin disposable plates designed to be thrown away. The triple-vented lid design also outperforms most disposable alternatives. Waste: A single 20-pack sleeve replaces hundreds of disposable plates over its lifetime — meaningful waste reduction for serious cultivators or labs.

The triple vents allow controlled gas exchange between the inside and outside of the dish, which prevents excessive condensation buildup on the lid during incubation. Excessive condensation can drip onto your culture and cause issues. At the same time, the vent design maintains a sterile barrier against airborne contaminants — gases pass through, but contaminating spores and dust particles don't. This is the same vent design used in higher-end commercial laboratory dishes.

Yes — these are general-purpose laboratory petri dishes suitable for any application where 90mm polypropylene dishes are appropriate. Common non-mycology uses include cannabis tissue culture, plant tissue culture and micropropagation, bacterial and fungal culture for microbiology, classroom biology labs, science fair projects, and DIY home lab work. The dishes meet the dimensional and sterility standards for general lab use.

Yes — the dishes are factory-sterilized and arrive in a sealed protective sleeve. They're sterile until you open the sleeve. After first use, you sterilize them yourself between cycles using a standard autoclave or pressure cooker.

Microppose products are designed in the USA and manufactured in India by one of the world's leading labware producers. This combination delivers the quality control standards of US engineering with competitive pricing made possible by international manufacturing. Microppose is one of the most trusted brands in mycology supplies for filter patches, spawn bags, and reusable laboratory plastics.

Yes — Microppose reusable petri dishes are available in full cases and pallets at significant volume discounts, with freight shipping included. This is ideal for commercial labs, university biology programs, research facilities, and larger mycology operations. Contact us for wholesale case and pallet pricing.