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Discussion Starter #1
I have a question concerning the safety of using mylar bags.

I ran across some info indicating that mylar film is comprised of BoPet, which stands for biaxially-oriented polyethylene terephthalate

Sources:
https://americanpatriotsurvivalist.com/mylar-bags/
https://www.primalsurvivor.net/mylar-bags-food-storage/
https://www.fshiny.com/what-is-mylar-bags/

If plastic water bottles that are made from PET/PETE will eventually leach toxic chemicals into the water they hold, what would prevent the mylar bags from doing the same with age? Perhaps it would have something to do with the "biaxially-oriented" portion of its name. Are they laminated, and the PET is on the outside?

Not surprisingly, I found some answers indicating it's safe, and they can be used for long term food storage. And many people use these for that purpose.

https://ask.extension.org/questions/290763
https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=18457

But I'm trying to reconcile in my head how the bags are OK to use, and water bottles are toxic after a period of 6 months to two years, depending on storage conditions.

Could there be a risk factor here? Or am I just being over analytical? :confused:

EDIT: I have reached out to some vendors and manufacturers, and am awaiting a response.
 

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65,879 Posts
I have a question concerning the safety of using mylar bags.

I ran across some info indicating that mylar film is comprised of BoPet, which stands for biaxially-oriented polyethylene terephthalate

Sources:
https://americanpatriotsurvivalist.com/mylar-bags/
https://www.primalsurvivor.net/mylar-bags-food-storage/
https://www.fshiny.com/what-is-mylar-bags/

If plastic water bottles that are made from PET/PETE will eventually leach toxic chemicals into the water they hold, what would prevent the mylar bags from doing the same with age? Perhaps it would have something to do with the "biaxially-oriented" portion of its name. Are they laminated, and the PET is on the outside?

Not surprisingly, I found some answers indicating it's safe, and they can be used for long term food storage. And many people use these for that purpose.

https://ask.extension.org/questions/290763
https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=18457

But I'm trying to reconcile in my head how the bags are OK to use, and water bottles are toxic after a period of 6 months to two years, depending on storage conditions.

Could there be a risk factor here? Or am I just being over analytical? :confused:

EDIT: I have reached out to some vendors and manufacturers, and am awaiting a response.
Water acts as a solvent. The foods stored in mylar are dry.
 

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Beer Truck Door Gunner
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30,270 Posts
Mike called it.

Mylar is PET and a metal foil layer. It is not the best choice to store wet foods in. This is one reason why metal cans are superior to mylar retort packaging. But it is safe when dry. This is one reason that in the past before mylar was readily available that people stored dried foods in 2ltr plastic soda bottles. But the bottles do allow gas exchange that allows oxygen to get in later. Thus the migration to mylar.

Look up the phrase "universal solvent" sometime. Now you will understand why moisture is a threat to stored food.

Congrats on being observant enough to note the disparity of use. Few people notice the apparent contradiction in use.

It just mean you are paying attention. :)
 

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Discussion Starter #4
I kind of figured it had something to do with water/moisture leaching toxins out of aged PET. Last thing I wanted to do though was assume toxins couldn't leach into dry food.

Thank you Mike and Zeke! I've read a number of your posts over the years, and you both offer a wealth of information here!! And it's improved my preps.
 
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