Cotton made flame retardant using phosphine oxide instead of carcinogenic formaldehyde; comfort no longer degraded

https://www.empa.ch/web/s604/eq72-cellulose

"The phosphine oxide networks, thus formed, does not wash out: After 50 launderings, 95 percent of the flame retardant network is still present in the fabric... the researchers also incorporated in situ generated silver nanoparticles inside the fabric... provide the fiber with antimicrobial properties and survive 50 laundry cycles, too"