20mm Synthetic ePTFE Filter Stickers
0.25µm Filter Patch for  Jar Lids – 24 off

Replace messy polyfil and tearing micropore tape with industrial ePTFE filter patches. Engineered specifically for high-performance grain spawn and liquid culture jars, these hydrophobic stickers provide continuous, high-airflow oxygen exchange while completely blocking mould spores, wild yeasts, and bacteria. 100% waterproof and fully autoclavable.

Key Features:

• High-Quality Synthetic Material: Crafted from durable synthetic ePTFE filter paper, these stickers are built to withstand the rigors of mushroom cultivation sterilization procedures, providing reliable performance throughout the growth cycle.
• Precision Filtration: With a pore size of 0.25 µm, the filter stickers effectively block unwanted contaminant spores, allowing only the necessary gases to pass through. This precision ensures a healthier environment for your mushroom mycelium to thrive.
• Hydrophobic: Because of their ability to repel water and resist water wetting, hydrophobic membrane filters are commonly used for preventing airborne contaminants ingress.
• Easy Application: The self-adhesive backing allows for quick and hassle-free application to any jar lid. Simply peel and stick underneath for an instant upgrade to your cultivation setup.
• Versatile Use: Ideal for a variety of mushroom species or any culture, these filter stickers are perfect for both beginners and experienced cultivators looking to enhance their growing conditions.

How to Use:

These filter patch stickers, made of ePTFE, have an Outside Diameter of 20 mm and an autoclavable 5mm glue ring on one side, giving an effective 10mm diameter unglued filtration area.

1. Make a 8-10mm hole on container lid.
2. Clean edges of holes for a smooth feel, clean with rubbing alcohol to remove any dirt/oil.
3. Attach sticker to inside of lid with unglued section over hole.
4. Firmly press down outer rim of sticker for proper adhesion
5. Autoclave bottled contents to sterilize, leave lid a 1/4 turn open to prevent airlocks, after sterilization firmly close lid when cool to touch.

Pair the ePTFE with SMS-Tape, to get 0.2 µm, HEPA like performance. Place the sticker over hole and the locate with 5cm square of the  SMS-Tape to convert even bags.