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newaccountzuerich t1_j2cxglm wrote

Reply to comment by mimprocesstech in [OC] Weekly Plastic and Metallic waste from a 150 Seat Diner (lbs) by Hi_its_GOD

The foil layer is an oxygen-impermeable layer.

Thin plastics can slowly allow gases to cross, and without the foil layer the shelf life of the contents would be reduced.

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Saxonbrun t1_j2deg3p wrote

Additionally the acidity of ketchup will eat through most plastic. Ketchup bottles are made of PET which isn't affected by the acidity, along with a small amount of EVOH to serve as an oxygen barrier to prevent spoilage.

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