Another warning.

[MeJasonT]

Is this a good time to mention material science, The great thing about plastic recycling at home and 3D printing is that we can now identify different plastics.
PET plastic Polyethylene terephthalate don't ask - is really crap for keeping acid or strong alkaline such as Caustic soda in (Sodium hydroxide https://en.wikipedia.org/wiki/Sodium_hydroxide). isn't sodium salt.
Polypropylene is the baby for chemical jars where your average ABS and PLA 3D printer stuff are not so good. However you can smooth 3D prints by putting them in a container with superglue, the fumes decay the surface smoothing your part also superglue vapour is damn good for lifting latent fingerprints if you watch CSI.


https://en.wikipedia.org/wiki/Plastic
https://www.ryedale.gov.uk/attachmen...ymer_types.pdf