{"product_id":"ptfe-breathable-membrane-mushroom-cultivation-jar-lids-32pcs","title":"PTFE Breathable Membrane Mushroom Cultivation Jar Lids – 32pcs","description":"\u003cp\u003eGrow healthier mushrooms with these \u003cstrong\u003eHydrophobic Breathable PTFE Membrane Stickers\u003c\/strong\u003e — a must-have for any home cultivator or mycology enthusiast. This pack of \u003cstrong\u003e32 filter membrane stickers\u003c\/strong\u003e is designed to fit standard wide-mouth jar lids, allowing optimal gas exchange while keeping out contaminants and moisture.\u003c\/p\u003e\n\n\u003cp\u003eMade from high-quality \u003cstrong\u003eePTFE (expanded polytetrafluoroethylene) film\u003c\/strong\u003e, these membranes are water-repellent, high-temperature resistant, non-toxic, and built for repeated use. The 20mm diameter size is ideal for mason jars and other wide-mouth cultivation vessels commonly used in mushroom growing setups.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHydrophobic ePTFE Material:\u003c\/strong\u003e Repels water and contaminants while allowing essential airflow for healthy mycelium growth\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e20mm Diameter:\u003c\/strong\u003e Perfectly sized for wide-mouth jar lids used in standard mushroom cultivation setups\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Temperature Resistant:\u003c\/strong\u003e Safe for use through pressure cooking and sterilization cycles\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNon-Toxic \u0026amp; Food Safe:\u003c\/strong\u003e Made from inert PTFE film — safe for use with edible mushroom varieties\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy Peel-and-Stick Application:\u003c\/strong\u003e Simply peel and apply over the hole in your jar lid — no tools required\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePack of 32:\u003c\/strong\u003e Enough to equip multiple jars for a full cultivation batch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable \u0026amp; Reusable:\u003c\/strong\u003e Built to last through multiple grows and sterilization cycles\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e32 × Hydrophobic Breathable Membrane Filter Stickers (20mm)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e ePTFE Film\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiameter:\u003c\/strong\u003e 20mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 32 pieces\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible With:\u003c\/strong\u003e Wide-mouth jar lids\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Resistance:\u003c\/strong\u003e High\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Use Breathable Membranes for Mushroom Cultivation?\u003c\/h2\u003e\n\u003cp\u003eProper gas exchange is critical for successful mushroom cultivation. Mycelium requires fresh oxygen and needs CO₂ to escape — while contamination from airborne spores, bacteria, and moisture must be kept out. These ePTFE membranes strike the perfect balance, acting as a sterile filter that lets air flow freely while forming a reliable barrier against contaminants. Learn more about mycology growing techniques at \u003ca href=\"https:\/\/www.ams.usda.gov\/\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eUSDA Agricultural Marketing Service\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003ePerfect For\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eHome mushroom growers \u0026amp; hobbyists\u003c\/li\u003e\n  \u003cli\u003eMycology enthusiasts and beginners\u003c\/li\u003e\n  \u003cli\u003eDIY substrate jars and grain spawn preparation\u003c\/li\u003e\n  \u003cli\u003eScience projects and laboratory cultures\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What are these hydrophobic breathable membrane stickers used for in mushroom cultivation?\u003c\/h4\u003e\n\u003cp\u003eA: These 20mm ePTFE membrane stickers are placed over the hole in wide-mouth jar lids used for mushroom substrate or grain spawn. They allow essential gas exchange (oxygen in, CO₂ out) while acting as a sterile barrier against contaminants, moisture, and airborne particles — making them a key component in a clean and successful mushroom grow.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Are these membranes safe to use during pressure cooking or sterilization?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. These membranes are made from high-quality ePTFE (expanded PTFE) film, which is high-temperature resistant and non-toxic. They are designed to withstand the sterilization process commonly used to prepare mushroom cultivation jars, so you can leave them in place during pressure cooking cycles.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What jar size are these membrane stickers compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: The membranes are 20mm in diameter and are designed to fit the filter holes drilled in standard wide-mouth mason jar lids, which are the most widely used vessels in home mushroom cultivation. Always ensure your lid hole is appropriately sized (around 16–18mm) for a secure, sealed fit.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How many pieces are included in one pack?\u003c\/h4\u003e\n\u003cp\u003eA: Each pack contains 32 hydrophobic breathable membrane stickers, giving you enough material to set up multiple cultivation jars in a single grow batch.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What are these hydrophobic breathable membrane stickers used for in mushroom cultivation?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"These 20mm ePTFE membrane stickers are placed over the hole in wide-mouth jar lids used for mushroom substrate or grain spawn. 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