What OTR means, and why it decides your shelf life
Oxygen transmission rate is the one number that tells you how much oxygen gets through your film.
Barrier films
PA/PE or plain PE: when do you need nylon?
PE is cheaper, but it lets oxygen through and punctures easily. Here is where nylon pays for itself.
EVOH or PVDC: choosing a barrier layer
Both block oxygen very well. They behave differently in humidity and heat.