To make it clear, I mean the period or timeline, so this include the entirety of the world during up to 1500, not just specifically the technology of ancient/medieval Europe, ancient/medieval Japan, ancient/medieval China, ancient/medieval middle east, ancient/medieval india, ancient/medieval south/north America, etc.
I want to know can the technology of the time make non biodegradable plastic bag or other modern plastic materials, and not due to natural occurrence or coincidence but deliberately produced using human technology in this periods.
Excluding "shellac", since I mean here is the non biodegradable shopping plastic bag that we use everyday in modern period, though correct me if they actually use or has shellac as one of the material components, since I am not knowledgeable with chemistry nor know much how plastic bag specifically is made industrially, if it is, then it is fine to include it, though I am not exactly asking for alternative using shellac to make bag, which is done even during ancient time, so at least that thing is excluded, since I already know of that.
also excluding leather, beeswax, wet clay pot, since @AlexP tell me thats also count as plastic.
the technology here can be mix or combine from other culture/civilizations in order to make the plastic bag if certain technology in certain region or culture/civilizations is not enough or sufficient to do that.
assuming the people in this periods know advance chemistry, so I won't accept reasoning that they can't make it because they don't know the chemistry. but I can accept the reasoning if even if they know the chemistry, their technology is insufficient to make it, even if combining the technology from other culture/civilizations.
for future reader, since sooner or latter comment in chat will disappear, i just copy paste @Nosajimiki comment regarding this "assuming they know advance chemistry" remember know and can make is a different thing.
There are plenty of things invented between 1500 and now that have nothing to do with Chemistry. Just because you can refine petrol does not mean you will invent the internal combustion engine. Many pre-industrial civilizations invented modern things but never figured out how to modernize with them. Chemistry, like the steam engine, was a huge game changer in our history. But as we know, the steam engine was invented LONG before we learned to make it useful.
Even with knowledge of chemistry, all of those things had to be discovered. Chemistry only tells us that A + B = C, it does not tell us where to get A or B to begin with, nor does it tell us that C is the end goal. That takes research and lots of it. I'm sure high explosives would happen quickly, but without understanding biology there are no artificial fertilizers, without mechanization, artificial fibers can't be mass produced, etc.
for my personal example (not from @Nosajimiki), historically theres many greek philoshoper that already know atom theory, that doesnt mean they suddenly know how to make atomic bomb or fusion/nuclear reactor etc and not make it less greek.
- reasoning that say they can't make it due to the certain region lack the raw materials component is out of the question, since it can be easily handwaved with the magic of worldbuilding, but again, I accept the reasoning if for example they cant extract certain materials even with the combination of technology from other culture in that periods.
I don't mind the finished product is crude or not perfect like our modern non biodegradable plastic bag as long they can make it, but of course it even better if it strong enough to hold stuff at least. and even better if their technology in that periods actually can make other modern plastic materials if they know the advance chemistry even if the result is crude.
feel free to correct my grammar or fix the tag to the appropriate one for my question, since some of the tag description/intention is not clear to me.