Microppose 28mm 0.3 Micron Self-Adhesive Lid Filter Stickers for Jar Lids & Tissue Culture (21-Pack)
Microppose 28mm 0.3 Micron Self-Adhesive Lid Filter Stickers for Jar Lids & Tissue Culture (21-Pack) is backordered and will ship as soon as it is back in stock.
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Description
Description
Turn any jar lid or culture container into a breathable, contamination-proof workspace in seconds. The Microppose 28mm 0.3 Micron Self-Adhesive Lid Filter Stickers peel and stick directly over a drilled hole in metal or plastic lids, letting your culture breathe while blocking airborne spores and bacteria.
Backed by industrial-strength 3M adhesive, these filters stay put through handling, autoclaving, and long incubation runs — no peeling, no falling off. Each sheet gives you 21 filters, and the larger 28mm face delivers extra gas exchange — suited to wide-mouth jars, larger lids, and tubs where more airflow helps.
- Filtration0.3 Micron
- Adhesive3M Backing
- Count21 Per Sheet
- Size28mm Round
- Material100% Recycled
Why Growers Choose These Filters
- True 0.3 micron filtration — stops contaminant spores and bacteria while allowing clean, consistent gas exchange
- Larger 28mm surface — more filter area for better airflow on wide-mouth jars and tubs
- Won't fall off — industrial 3M adhesive holds through autoclaving, humidity, and months of incubation
- Breathes better — a proprietary micron layer resists moisture saturation for cleaner colonization
Specifications
| Property | Detail |
|---|---|
| Filtration Efficiency | 0.3 Micron |
| Adhesive | 3M industrial-strength backing |
| Properties | Hydrophobic & oleophobic |
| Sterilization | Fully autoclavable |
| Material | 100% recycled |
| Filters Per Sheet | 21 |
| Filter Size | 28mm round |
How to Apply
- Drill or punch a hole in your jar lid or tissue culture lid — a 3/8″ to 1/2″ hole pairs well with the 28mm size.
- Peel a filter from the sheet and press it firmly over the opening, centering it so the adhesive fully seals around the hole.
- Pair with a self-healing injection port for a complete DIY sterile lid ready for inoculation and transfers.
Common Uses
- Wide-mouth grain spawn and liquid culture jars
- Agar work and spore-to-liquid culture
- Plant tissue culture vessels and larger containers
- DIY sterile lids for injections and transfers
Frequently Asked Questions
What size hole should I drill for these filters?
Drill or punch a hole smaller than the filter so the 3M adhesive fully seals around the edge. For the 28mm size, a 3/8″ to 1/2″ hole works well and takes full advantage of the larger filter surface.
Can these be autoclaved or pressure cooked?
Yes. They are fully autoclavable and high-temperature resistant. The 3M adhesive and proprietary micron layer hold up to repeated steam sterilization without peeling or breaking down.
What can I use them for?
Wide-mouth grain spawn jars, liquid culture, agar work, and plant tissue culture vessels — anywhere you need sterile gas exchange with extra airflow. Pair them with a self-healing injection port to build a complete DIY sterile lid for inoculation and transfers.
How is 0.3 micron different from cheaper filter discs?
The 0.3 micron layer blocks bacteria and mold spores while still breathing well. Unlike repurposed filters, this proprietary layer resists moisture saturation and does not degrade from steam, so you get more reliable, faster colonization.
Should I get the 28mm or the 18mm?
Choose the 28mm (21 per sheet) for more filter surface area on wide-mouth jars, larger lids, or tubs where extra gas exchange helps. Go with the 18mm (50 per sheet) for standard grain spawn jars, liquid culture jars, and small tissue culture containers.
