The US Food and Drug Admini-stration, FDA is banning three grease-resistant chemical substances from food packaging, reported Packaging News.  The chemicals, which are linked to cancer and birth defects, are used in pizza boxes, microwave popcorn bags, sandwich wrappers and other food packaging.  The packaging substances banned by FDA, in an order that takes effect 1 Feb, are perfluorinated compounds or PFCs, a class that includes the chemicals used to make DuPont’s Teflon and 3M’s Scotchgard.