48-Pack 20mm EPTFE Filter Discs for Mushroom Jar Lids

$15.50 $18.47

48-Pack 20mm EPTFE Breathable Filter Discs for Wide Mouth Jar Lids

Take your mushroom cultivation and jar-lid filtration to the next level with these premium EPTFE (expanded PTFE) synthetic filter paper stickers. Each self-adhesive disc measures 20mm and adheres neatly under wide-mouth jar lids, creating a breathable yet fully waterproof barrier — the ideal microclimate for healthy mycelium growth and contamination-free cultivation.

Made in Mainland China.

Why EPTFE?

EPTFE is an advanced waterproof-breathable membrane engineered with millions of microscopic pores. Each pore is up to 700× larger than a water vapor molecule, yet 10,000× smaller than a water droplet — meaning moisture and gases move freely while liquid water, dust, and contaminants are completely blocked.

Key Features

Waterproof: Micropores (0.1–1.0 µm) prevent water and corrosive liquids from passing through, extending the service life of your jars and equipment.
Breathable: Allows free air and gas exchange so CO₂ escapes and fresh oxygen enters — essential for thriving mushroom cultures.
Dust & Contaminant Barrier: Dense, uniform micropore network blocks airborne particles, mold spores, and environmental pollutants.
Pressure Balancing: Equalises internal and external air pressure, protecting seal integrity and preventing condensation on inner jar walls.
Quick Recovery: Air permeability is instantly restored even after contact with water or oils.
UV & Chemical Resistant: Strong chemical inertia and UV resistance ensure long-lasting performance across diverse growing environments.
Ultra-Thin & Lightweight: Low-profile design fits discreetly under any standard wide-mouth jar lid without affecting the seal.
Easy to Clean: Resists corrosive contaminants and can be wiped clean, keeping your setup hygienic cycle after cycle.

Specifications

Material: EPTFE (Expanded Polytetrafluoroethylene) Synthetic Filter Membrane
Diameter: 20mm
Pack Size: 48 pcs per sheet
Application: Wide-mouth jar lids for mushroom cultivation, substrate jars, liquid culture jars
Origin: Made in Mainland China

What's in the Box?

1 × Sheet of 48 × 20mm EPTFE Filter Disc Stickers

Frequently Asked Questions

Q: What size jar lids are these 20mm EPTFE filter discs compatible with?

A: These 20mm filter discs are designed to fit under standard wide-mouth mason jar lids commonly used in mushroom cultivation, such as regular and half-pint wide-mouth lids. The self-adhesive backing makes installation quick and secure — simply peel and stick to the inside of the lid over a pre-drilled hole.

Q: How do these EPTFE filter discs help with mushroom cultivation?

A: The EPTFE membrane allows continuous fresh air exchange (FAE) while blocking contaminants like competing mold spores, bacteria, and airborne dust. This keeps your substrate or liquid culture jars properly ventilated without the risk of contamination — a critical balance for successful mushroom growing.

Q: Are these filter stickers reusable or single-use?

A: The filter discs are primarily designed as single-use adhesive stickers for a secure, airtight bond to the jar lid. However, the EPTFE membrane itself is durable, UV-resistant, and chemically inert, so lids can be reused as long as the adhesive bond remains intact and the filter is not visibly damaged.