Diameter:65mm,0.3um Pore size,Hydrophobic PTFE membrane,waterproof and air exchange for Mushroom cultivation. Fit for 70mm regular mouth split type Mason Jar lid,directly stick on the ring . High filter rate: these adhesive patches have a filtration rate of 99.97% ,can filter 0.3 μm object ,for gas exchange and keeps contamination out High temperture resistance:these disc filters feature outstanding heat resistance and pressure resistance, which can be applied to your autoclaves,press cooker and steam sterilizer. Strong adhesive: need to clean and dry the surface before sticking filter patch
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