with growing attention to phthalates in plastics regarding food and toys etc one must wonder if there 
is any issue with beekeeping too. 

http://www.ourstolenfuture.org/NEWSCIENCE/oncompounds/phthalates/phthalates.htm

think about the various uses plastic now has in commercial beekeeping

foundation, frames, queen cups, feeders

i don't know enough about the science behind the concerns and then how that translates to bee 
health risks. 

put another way what risk if any is associated with the use of plastic in brood nest chambers?  

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