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.
Disclaimer : The above information has been collected from internet. The owner of this site is not responsible for the correctness of information. However, if you find this information to be wrong, please leave a comment or send an email to firstname.lastname@example.org.