This is not something that would matter in any food-contact application.
While PTFE neither is modified by food nor any part of it is leeched into the food, it can retain minute amounts of food in its pores, which may be retained despite further attempts to clean it, which does not happen with glass.
When a PTFE container is used to store different kinds of food, it can transfer the scent of one of them to the other.
The PTFE recipients used for chemical experiments may be cleaned by aggressive methods, e.g. with strong acids and/or strong oxidants, which would destroy any organic substances. Such cleaning methods cannot be applied in a common household.
Therefore borosilicate glass or soda-lime glass are better food-contact materials than PTFE, even if they can react with various chemicals that would have no effect on PTFE, but none of those chemicals are encountered in food.
https://en.m.wikipedia.org/wiki/Polytetrafluoroethylene The commonly known brand name of PTFE-based composition is Teflon by Chemours, a spin-off from DuPont, which originally discovered the compound in 1938.
https://en.m.wikipedia.org/wiki/GenX GenX chemicals are used as replacements for PFOA for manufacturing fluoropolymers such as Teflon
In June of 2017, The Wilmington Star-News broke the story that GenX was found in the Cape Fear River – the drinking water supply for 500,000 people.
From https://pubchem.ncbi.nlm.nih.gov/source/hsdb/833 :
"Perfluorooctanoic acid (PFOA), also known as C8, is another man-made chemical. It is used in the process of making Teflon and similar chemicals (known as fluorotelomers), although it is burned off during the process and is not present in significant amounts in the final products." [GenX is very similar.]
And there's no technical reason why manufacturing PFAS polymers necessarily has to result in PFAS small molecule pollution. The waste could be captured and treated with processes such as supercritical water oxidation. This would of course cost more, but seeing as there's no good substitute for PFAS polymers, I'd happily pay more for them. Pollution, like all externalities, is a market failure, and it's the government's job to fix market failures with regulation.
Glass has the benefit of very high chemical inertness while also being extremely resistant to mechanical abrasion. Some types of glass are clearly not good enough (eg most 'crystal'/lead glasses), but borosilicate and fused silica are certainly well proven materials.
Another process that is relevant, leaching, while considered a 'chemical process' does not actually involve any kind of 'reactivity'. It's governed by solubility and statistical mechanics.
Just point an IR thermometer at it. They're cheap and useful for cooking even if you're not using non-stick.
Borosilicate glass is much more resistant to acids (except hydrogen fluoride) than to alkalis, but most foods are acidic or neutral, none are alkaline.
Of the materials commonly encountered, the safest for food contact are borosilicate glass, normal glass, commercially-pure titanium and stainless steel.
The reason is that PTFE, like any plastic, is porous, so it can never be perfectly cleaned, but it will retain embedded in it some residues of the food previously stored in it. This can lead just to some undesirable smell, but in appropriate temperature and humidity conditions it can also lead to the growth of bacteria.
For food storage and handling, the best food-contact materials remain glasses or metals, which can be cleaned perfectly.