https://www.fs.usda.gov/features/revolutionary-carbon-foam-wood#:~:text=Carbon%20foam%E2%80%94a%20stiff%2C%20porous,of%20absorbing%20sound%20and%20radiation.
a good read here, this is probably why our cfoam will never take off...
Domtar, a 2bil market cap company is working on something a lot cheaper and without the use of coal.