Can anyone identify this material?

Someone on one of my local sites offered this for free:



describing it as "10 sheets of clean, dry recycled-fiber batting, packaged in plastic, that was used as insulation for refrigerated deliveries we've received in the past 6 weeks."

Does anyone recognize this stuff and know what's in it? If not full of synthetics, plastic, or toxic waste, it looks like it'd be a useful material. But how to tell?

I have seen it use on bed mattresses, it maybe cotton and synethetics

I recycle wool sweaters, etc and that looks like a mixture of wool fibers there.

Get a soldering iron, nail, whatever hot (like, very hot) and touch it in a few spots. If you get spots melting or curling up, they're plastic. Organic fibers will just blacken and potentially smolder. Could easily have a mix of different fibers.

Looks like shoddy  - old clothes that have been shredded and upcycled.  Im guessing mixed natural and synthetic fibre, but a burn test would tell you more.

It might have fire retardant chemicals depending on the use and country.