Here is an interesting & useful information about the classification of plastic material & its usage in Tupperware products.
Soruce: http://order.tupperware.ca/pls/htprod_wwwcan/tup_widget.show_page?fv_page_code=prodcodes&fv_section_name=help&fv_category_code=search&fv_item_category_code=200550 target="_blank"
More information about Tupperware plastics can be found in below two pages.
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