Self-Sealing Textile - Breathable textile that becomes waterproof when wetted

This nonwoven textile has superabsorbent polymer particles embedded between its fibres. If the textile becomes wet, the particles absorb the water and swell to many times their original size. The swelled particles fill the air gaps between the fibres and the textile becomes waterproof. As the textile dries, the particles shrink and air permeability is restored.

Used for:
The material is initially marketed towards the footwear industry and is used for safety shoes in combination with a perforated sole. It is also used as a membrane in air pressure vents for sealed housings for electronics.

Details:
The self-sealing textile has a much higher air permeability than traditional expanded PTFE membranes. Unlike PTFE membranes, the self-sealing textile does not release harmful chemicals when burned.

Idea:
Create a rain jacket that is waterproof and airtight only when it rains.</idea>

Try it:
Blow air through the sample to test the air permeability. Then drip water onto the sample and notice it does not pass through the textile.

All samples come with a laminated information card, which includes contact details for the supplier.