PTFE Breathable Membrane Mushroom Cultivation Jar Lids – 32pcs

Grow healthier mushrooms with these Hydrophobic Breathable PTFE Membrane Stickers — a must-have for any home cultivator or mycology enthusiast. This pack of 32 filter membrane stickers is designed to fit standard wide-mouth jar lids, allowing optimal gas exchange while keeping out contaminants and moisture.

Made from high-quality ePTFE (expanded polytetrafluoroethylene) film, 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.

Key Features

• Hydrophobic ePTFE Material: Repels water and contaminants while allowing essential airflow for healthy mycelium growth
• 20mm Diameter: Perfectly sized for wide-mouth jar lids used in standard mushroom cultivation setups
• High Temperature Resistant: Safe for use through pressure cooking and sterilization cycles
• Non-Toxic & Food Safe: Made from inert PTFE film — safe for use with edible mushroom varieties
• Easy Peel-and-Stick Application: Simply peel and apply over the hole in your jar lid — no tools required
• Pack of 32: Enough to equip multiple jars for a full cultivation batch
• Durable & Reusable: Built to last through multiple grows and sterilization cycles

What's Included

• 32 × Hydrophobic Breathable Membrane Filter Stickers (20mm)

Specifications

• Material: ePTFE Film
• Diameter: 20mm
• Quantity: 32 pieces
• Compatible With: Wide-mouth jar lids
• Temperature Resistance: High

Why Use Breathable Membranes for Mushroom Cultivation?

Proper 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 USDA Agricultural Marketing Service.

Perfect For

• Home mushroom growers & hobbyists
• Mycology enthusiasts and beginners
• DIY substrate jars and grain spawn preparation
• Science projects and laboratory cultures

Frequently Asked Questions

Q: What are these hydrophobic breathable membrane stickers used for in mushroom cultivation?

A: 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.

Q: Are these membranes safe to use during pressure cooking or sterilization?

A: 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.

Q: What jar size are these membrane stickers compatible with?

A: 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.

Q: How many pieces are included in one pack?

A: Each pack contains 32 hydrophobic breathable membrane stickers, giving you enough material to set up multiple cultivation jars in a single grow batch.