http://www.biopack.be/WebShop/En/?http://www.biopack.be/Lid-En/Food___Beverage_Packaging/13-290/Biodegradable_Drinking_Cups_for_Hot_and_Cold_Drinks.aspx
"Our biodegradable cardboard cups are made of pure cellulose. "
it's possible then, just clearing stuff up, don't over think it haha