Specifications: Size: 20mm in diameter. Colour: white. Membrane material: hydrophobic PTFE. Pore size: 0.3um Package:32*2 sheets Synthetic filter discs. Features: waterproof, breathable, high temperature and pressure resistance, reusable. 64 filter stickers included, ideal for all mushroom growers who want to provide a sterile growing environment with proper air exchange. These filter openings are great for a variety of growing techniques, including BRF jars, liquid culture, spawn growing and much more. Safe for pressure cooking and autoclave sterilization.

• HIGH FILTRATION RATE: these adhesive patches have a filtration rate of 99.97%, can filter 0.3μm object, for gas exchange and keep impurities out.
• Easy to apply: breathable, durable and reusable

Specifications

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