Science Daily has published a story taken from the American Chemical Society about flavour 'emissions' by plastic pipes. Apparently cPVC (chlorinated polyvinyl chloride) is the least flavoursome - a good thing! But one wonders the safety of a product made from a material (PVC) that is already being phased out of many sectors because of environmental concern.
http://www.sciencedaily.com/releases/2007/08/070823141100.htm
Lexan's polycarbonate plastic is also of a concern because it leaches bisphenol A which causes in utero neural and behavioural defects in lab animals.
However the US's National Toxicology Program Center for the Evaluation of Risks to Human Reproduction found the risks to the general adult population to be of "negligible concern for adverse reproductive effects following exposures."
http://cerhr.niehs.nih.gov/chemicals/bisphenol/draftBPA_MtgSumm080807.pdf
We will see how US & EU legislature comes to bear on all of this.
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