According to their website (https://www.lignin.se/news/2020/9/6/towards-more-sustainable-and-bio-degradable-polymers https://www.lignin.se/news/2020/9/6/towards

According to their website (https://www.lignin.se/news/2020/9/6/towards-more-sustainable-and-bio-degradable-polymers https://www.lignin.se/news/2020/9/6/towards-more-sustainable...) they use a raw material called "Lineo" by Stora Enso. And if you search for that you find https://www.storaenso.com/en/products/lignin/lineo https://www.storaenso.com/en/products/lignin/lineo Which includes a video of different forms of Lineo. Looks like a fine powder?