此文似乎不准网上搜索了一下, 似乎 #2 High-Density Polyethylene (HDPE) 和 #5Polypropylene (PP)是比较安全的塑料, 而#7反而是"junk plastic"... 可参见: http://web.aces.uiuc.edu/vista/pdf_pubs/FOODPACK.PDF http://72.14.235.104/search?q=cache:mzhL4eXFvEcJ:www.grist.org/advice/ask/2004/08/02/umbra-bottles/+HDPE+safe+reuse&hl=en&gl=sg&ct=clnk&cd=2 http://72.14.235.104/search?q=cache:hX7Yj_8A8fwJ:www.re-nourish.com/sustain/index.php%3Fblog%3D5%26cat%3D62+HDPE+safe+reuse&hl=en&gl=sg&ct=clnk&cd=5 以及 http://americanplasticscouncil.org/s_apc/sec.asp?TRACKID=&VID=86&CID=313&DID=931