Andrea Dietrich, Ph.D. told the ACS that her group evaluated several types of plastic piping: cPVC (chlorinated polyvinyl chloride), HDPE (high-density polyethylene), and PEX-aA and PEX-b, which are crosslinked polyethylenes. Each is approved and certified for use in drinking water applications by NSF International, an independent certification, standards and testing organization, and ANSI, the American National Standards Institute. "We found that cPVC has a low odor potential and it doesn't seem to release many organic chemicals," Dietrich said. "HPDE actually had the highest odor production, although it didn't release very many organic materials. The PEX-b pipe had a moderate amount of odors and also a moderate amount of organic chemicals that were released into the air. PEX-a had fewer odors and organics release than the PEX-b pipe." Click Here For Complete Article Text
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