Dear Alan,

please see this comprehensive table in the attached link.

Hope this helps!

Johannes

http://www.oakpackaging.com/include/assets/Materials.pdf

As you may be aware that there are different kind of plastics we can use for packaging of different street food but i find this article helpful.. Hope it will work for you too.. 

link is given below 

http://www.londonbiopackaging.com/eco-takeaway-containers-street-food-packaging-2/

Dear Alan,

I think for your case,  you can use laminated packaging like PE/AL/PE because plastic layer is good to protect you food form water and some gas and aluminum is able to protect your food form light, water and some gas as well. After using the packaging, I think it will extend the self-life of your food and protect your food from oxidation reaction.