48Pcs EPTFE Filter Stickers 20mm for Mushroom Jar Lids

$8.35 $10.02

48Pcs EPTFE Breathable Filter Stickers – 20mm for Wide Mouth Jar Lids

Take your mushroom cultivation and mycology projects to the next level with these premium EPTFE synthetic filter paper stickers. Engineered with advanced expanded polytetrafluoroethylene (EPTFE) membrane technology, each 20mm disc delivers a trifecta of waterproofing, breathability, and dust protection — all in a slim, self-adhesive format that fits perfectly under wide-mouth jar lids. Made in Mainland China.

Why EPTFE Filter Stickers?

EPTFE is a next-generation waterproof and breathable material featuring a microporous network structure. Its pores are 0.1–1.0 μm in diameter — over 10,000 times smaller than a water droplet yet 700 times larger than water vapor molecules. This means moisture and contaminants stay out while fresh air flows freely through your jar lids, creating the ideal microclimate for successful mushroom cultivation.

Key Features & Benefits

Waterproof Protection: Microscopic pores prevent water, salt, and other corrosive liquids from penetrating, protecting your substrate from unwanted moisture.
Superior Air Permeability: Allows gas exchange and heat dissipation while keeping contaminants out. Breathability is quickly restored even after contact with water or oil.
Effective Dust & Contaminant Barrier: Dense, uniform micropore distribution blocks dust particles and airborne contaminants to keep your grow environment clean.
Pressure Balancing: Helps equalize internal and external air pressure, protecting the integrity of your jar seals.
UV Resistant & Chemically Inert: Withstands environmental exposure and resists chemical degradation for long-lasting performance.
Thin, Lightweight & Discreet: The low-profile design makes these stickers easy to apply and barely noticeable under your jar lid.
Self-Adhesive & Easy to Use: Simply peel and stick under your wide-mouth jar lid — no tools or modifications required.

Specifications

Material: EPTFE (Expanded Polytetrafluoroethylene) Synthetic Filter Membrane
Diameter: 20mm
Quantity: 48 pieces per sheet
Application: Wide-mouth jar lids for mushroom cultivation, mycology, and related growing applications
Origin: Made in Mainland China

Package Contents

1 × Sheet of 48 EPTFE Filter Stickers (20mm each)

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Frequently Asked Questions

Q: What size jar lids are these EPTFE filter stickers compatible with?

A: These 20mm filter stickers are designed to fit under standard wide-mouth jar lids commonly used in mushroom cultivation and mycology. They are self-adhesive and adhere easily to the underside of most wide-mouth mason or canning jar lids.

Q: Do these filter stickers allow enough air exchange for mushroom cultivation?

A: Yes. The EPTFE membrane features micropores that are 700 times larger than water vapor molecules, enabling excellent gas exchange and airflow. This promotes healthy CO₂ and oxygen exchange essential for mushroom mycelium development while blocking contaminants.

Q: Are the stickers reusable or single-use?

A: These stickers are primarily designed for single-use application. Once adhered to the inside of a jar lid, they create a secure, long-lasting seal. For best results and contamination prevention, use a fresh sticker when preparing a new cultivation jar.

Q: Are these safe to use with food-grade mason jars?

A: Yes. EPTFE is chemically inert and widely recognized as a safe, non-reactive material. It does not leach chemicals and is UV resistant, making it suitable for use in growing environments over extended periods.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.